Evidence used
- No CISA KEV confirmation is currently recorded.
- The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
- EPSS is 0.48% for the current model date.
BlackTreeCVE IntelligenceFull vulnerability report · 2026
CVE-2026-42765High confidence
NULL Dereference in Certificate Verification with OCSP Checking
OpenSSL · OpenSSL
7.5HighCVSS 3.1
Within 7 days
Patch availableHigh technical severity; prioritise exposed affected systems while verifying vendor guidance.
R
Open reassessment dashboard →Operational reassessment
Published severity in operational context
Published severityHigh→Operational priority:High, unchanged from published severity.unchanged
Compensating controls
- Validate the affected product branch and deploy the verified fixed release.
- Restrict the affected network interface to trusted sources where business-safe.
- Monitor vendor guidance and exploitation sources for a material change.
Verification
- Confirm that the asset runs OpenSSL OpenSSL and falls inside the recorded affected range.
- Verify the installed build against the product-specific fixed version after deployment.
- Validate exposure, authentication requirements and compensating controls in the actual environment.
- Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Distribution package intelligence
4 package statesRelease-specific package status
Debian findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.
Repository candidate not checked
A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.
| Distribution release | Source package | Vendor state | Fixed version | Evidence |
|---|---|---|---|---|
| Debian trixietrixie · source | openssl | Not affectedDebian marks this release not affected (fixed-version marker 0). | Not published in this feed | Debian Security Tracker ↗Source updated 5 Oct 2026 |
| Debian bookwormbookworm · source | openssl | Not affectedDebian marks this release not affected (fixed-version marker 0). | Not published in this feed | Debian Security Tracker ↗Source updated 5 Oct 2026 |
| Debian forkyforky · source | openssl | Vendor fix publishedDebian records a fixed source-package version for this release. | 3.6.3-1 | Debian Security Tracker ↗Source updated 5 Oct 2026 |
| Debian sidsid · source | openssl | Vendor fix publishedDebian records a fixed source-package version for this release. | 3.6.3-1 | Debian Security Tracker ↗Source updated 5 Oct 2026 |
Direct vendor intelligence
1 currentAuthoritative vendor CSAF and VEX advisories
Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.
CVE-2026-42765 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityopenssl: NULL Dereference in Certificate Verification with OCSP Checking
The vendor explicitly identifies these products as affected by this CVE.
- edk2-aarch64 as a component of Red Hat Enterprise Linux 10
- edk2-ovmf as a component of Red Hat Enterprise Linux 10
- edk2-tools as a component of Red Hat Enterprise Linux 10
- edk2-tools-doc as a component of Red Hat Enterprise Linux 10
- edk2.src as a component of Red Hat Enterprise Linux 10
- mokutil as a component of Red Hat Enterprise Linux 10
- openssl as a component of Red Hat Enterprise Linux 10
- openssl-devel as a component of Red Hat Enterprise Linux 10
- openssl-libs as a component of Red Hat Enterprise Linux 10
- openssl-perl as a component of Red Hat Enterprise Linux 10
- openssl.src as a component of Red Hat Enterprise Linux 10
- shim-aa64 as a component of Red Hat Enterprise Linux 10
- Summary
- A flaw was found in OpenSSL. When an application is configured with specific non-default settings for certificate verification, including both Online Certificate Status Protocol (OCSP) response checking and partial chain verification, a NULL dereference can occur. This vulnerability can be triggered if the certificate chain lacks a self-signed trusted anchor, causing the application to crash. This leads to a Denial of Service (DoS) for the affected application.
- Remediation
- For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
High technical severity; prioritise exposed affected systems while verifying vendor guidance.
Patch available01
What, why and how
Issue summary: When a partial-chain certificate verification is enabled together with OCSP response checking for the whole chain, a NULL dereference will happen if the verified chain does not have a self-signed trusted anchor, crashing the process. Impact summary: A NULL pointer dereference can trigger a crash which leads to a Denial of Service for an application. When performing OCSP response checking for certificates in the verification chain, the code always tries to access the next certificate as the issuer. There is a check for a self-signed certificate. However with the partial chain verification enabled when the chain does not have a self-signed trusted anchor, the issuer will be NULL for the last certificate in the chain. A NULL pointer dereference then happens. This issue affects only applications which enable both OCSP verification of the certificate chain (X509_V_FLAG_OCSP_RESP_CHECK_ALL) and partial chain verification (X509_V_FLAG_PARTIAL_CHAIN) in the certificate verification. Both flags are disabled by default. For that reason, we have assigned Low severity to the issue. No FIPS modules are affected by this issue as the affected code is outside the OpenSSL FIPS module boundary.
What
Issue summary: When a partial-chain certificate verification is enabled together with OCSP response checking for the whole chain, a NULL dereference will happen if the verified chain does not have a self-signed trusted anchor, crashing the process. Impact summary: A NULL pointer dereference can trigger a crash which leads to a Denial of Service for an application. When performing OCSP response checking for certificates in the verification chain, the code always tries to access the next certificate as the issuer. There is a check for a self-signed certificate. However with the partial chain verification enabled when the chain does not have a self-signed trusted anchor, the issuer will be NULL for the last certificate in the chain. A NULL pointer dereference then happens. This issue affects only applications which enable both OCSP verification of the certificate chain (X509_V_FLAG_OCSP_RESP_CHECK_ALL) and partial chain verification (X509_V_FLAG_PARTIAL_CHAIN) in the certificate verification. Both flags are disabled by default. For that reason, we have assigned Low severity to the issue. No FIPS modules are affected by this issue as the affected code is outside the OpenSSL FIPS module boundary.
Why
The product dereferences a pointer that it expects to be valid but is NULL.
How
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.
What
Issue summary: When a partial-chain certificate verification is enabled together with OCSP response checking for the whole chain, a NULL dereference will happen if the verified chain does not have a self-signed trusted anchor, crashing the process. Impact summary: A NULL pointer dereference can trigger a crash which leads to a Denial of Service for an application. When performing OCSP response checking for certificates in the verification chain, the code always tries to access the next certificate as the issuer. There is a check for a self-signed certificate. However with the partial chain verification enabled when the chain does not have a self-signed trusted anchor, the issuer will be NULL for the last certificate in the chain. A NULL pointer dereference then happens. This issue affects only applications which enable both OCSP verification of the certificate chain (X509_V_FLAG_OCSP_RESP_CHECK_ALL) and partial chain verification (X509_V_FLAG_PARTIAL_CHAIN) in the certificate verification. Both flags are disabled by default. For that reason, we have assigned Low severity to the issue. No FIPS modules are affected by this issue as the affected code is outside the OpenSSL FIPS module boundary.
Why
The product dereferences a pointer that it expects to be valid but is NULL.
How
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.
02
Exploit reality and attack path
CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.
Observed exploitation No confirmed evidence
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.
Public PoC / exploit material None recorded
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.
- Likely attack path
- a network path → NULL Pointer Dereference → disrupt the affected service
- Attack surface
- Network
- Privileges required
- None: unauthenticated exploitation is possible
- User interaction
- None
- Attack complexity
- Low: no specialised conditions are recorded
- Security boundary
- Unchanged: impact remains within the vulnerable component's security authority
- Weakness
?
CWE means Common Weakness Enumeration: a standard category for the underlying weakness. - CWE-476 ↗
CWE-476: NULL Pointer Dereference. The product dereferences a pointer that it expects to be valid but is NULL.
- CVSS vector
?
CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCommon Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.- Post-exploitation / living off the land
- No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
03
Patch and workaround
Operational remediation based on structured source evidence.
- Status
?
Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change. - Patch available
- Affected
- edk2-aarch64 as a component of Red Hat Enterprise Linux 10
- edk2-ovmf as a component of Red Hat Enterprise Linux 10
- edk2-tools as a component of Red Hat Enterprise Linux 10
- edk2-tools-doc as a component of Red Hat Enterprise Linux 10
- edk2.src as a component of Red Hat Enterprise Linux 10
- mokutil as a component of Red Hat Enterprise Linux 10
- openssl as a component of Red Hat Enterprise Linux 10
- openssl-devel as a component of Red Hat Enterprise Linux 10
- openssl-libs as a component of Red Hat Enterprise Linux 10
- openssl-perl as a component of Red Hat Enterprise Linux 10
- openssl.src as a component of Red Hat Enterprise Linux 10
- shim-aa64 as a component of Red Hat Enterprise Linux 10
- shim-unsigned-aarch64.src as a component of Red Hat Enterprise Linux 10
- shim-unsigned-x64.src as a component of Red Hat Enterprise Linux 10
- shim-x64 as a component of Red Hat Enterprise Linux 10
- openssl as a component of Red Hat Enterprise Linux 6
- openssl-devel as a component of Red Hat Enterprise Linux 6
- openssl-perl as a component of Red Hat Enterprise Linux 6
- openssl-static as a component of Red Hat Enterprise Linux 6
- openssl.src as a component of Red Hat Enterprise Linux 6
- AAVMF as a component of Red Hat Enterprise Linux 7
- OVMF as a component of Red Hat Enterprise Linux 7
- ovmf.src as a component of Red Hat Enterprise Linux 7
- compat-openssl10 as a component of Red Hat Enterprise Linux 8
- compat-openssl10.src as a component of Red Hat Enterprise Linux 8
- edk2-aarch64 as a component of Red Hat Enterprise Linux 8
- edk2-ovmf as a component of Red Hat Enterprise Linux 8
- edk2.src as a component of Red Hat Enterprise Linux 8
- mingw-openssl.src as a component of Red Hat Enterprise Linux 8
- mingw32-openssl as a component of Red Hat Enterprise Linux 8
- and 42 more
- Fixed
- bootupd-0:0.3.2-1.hum1@aarch64 as a component of Red Hat Hardened Images
- bootupd-0:0.3.2-1.hum1@x86_64 as a component of Red Hat Hardened Images
- chunkah-0:0.6.0-3.hum1@aarch64 as a component of Red Hat Hardened Images
- chunkah-0:0.6.0-3.hum1@src as a component of Red Hat Hardened Images
- chunkah-0:0.6.0-3.hum1@x86_64 as a component of Red Hat Hardened Images
- openssl-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images
- openssl-0:3.5.8-0.1.hum1@src as a component of Red Hat Hardened Images
- openssl-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images
- openssl-config-fips-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images
- openssl-config-fips-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images
- openssl-devel-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images
- openssl-devel-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images
- openssl-devel-engine-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images
- openssl-devel-engine-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images
- openssl-fips-provider-upstream-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images
- openssl-fips-provider-upstream-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images
- openssl-libs-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images
- openssl-libs-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images
- openssl-perl-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images
- openssl-perl-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images
- openssl3-0:3.5.8-0.1.hum1@src as a component of Red Hat Hardened Images
- openssl3-devel-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images
- openssl3-devel-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images
- openssl3-devel-engine-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images
- openssl3-devel-engine-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images
- openssl3-libs-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images
- openssl3-libs-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images
- python-cryptography-0:50.0.0-1.hum1@src as a component of Red Hat Hardened Images
- python3-cryptography-0:50.0.0-1.hum1@aarch64 as a component of Red Hat Hardened Images
- python3-cryptography-0:50.0.0-1.hum1@x86_64 as a component of Red Hat Hardened Images
- and 40 more
- Action
- For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
- Workaround
- No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04
Evidence and provenance
Published 9 Jun 2026 · Last source change 10 Jun 2026, 07:48 UTC · CWE-476 · NULL Pointer Dereference
CVE recordCVE.org · 5.2
CVSS sourceCISA ADP
EPSS source FIRST · tracked since 2026-08-14
?
The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.European sourceENISA EUVD · EUVD-2026-35482
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD enriched
Core structured fields are present and their contributing authorities are shown above.
Material change intelligence
View recent updates ↗What changed after publication
- Affected versionsThe structured affected or fixed version information changed.Red Hat Product Security ↗
- Before
- Fixed: bootupd-0:0.3.2-1.hum1@aarch64 as a component of Red Hat Hardened Images; bootupd-0:0.3.2-1.hum1@x86_64 as a component of Red Hat Hardened Images; chunkah-0:0.6.0-3.hum1@aarch64 as a component of Red Hat Hardened Images; chunkah-0:0.6.0-3.hum1@src as a component of Red Hat Hardened Images; chunkah-0:0.6.0-3.hum1@x86_64 as a component of Red Hat Hardened Images; openssl-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl-0:3.5.8-0.1.hum1@src as a component of Red Hat Hardened Images; openssl-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl-config-fips-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl-config-fips-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl-devel-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl-devel-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl-devel-engine-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl-devel-engine-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl-fips-provider-upstream-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl-fips-provider-upstream-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl-libs-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl-libs-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl-perl-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl-perl-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl3-0:3.5.8-0.1.hum1@src as a component of Red Hat Hardened Images; openssl3-devel-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl3-devel-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl3-devel-engine-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl3-devel-engine-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl3-libs-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl3-libs-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; python-cryptography-0:50.0.0-1.hum1@src as a component of Red Hat Hardened Images; python3-cryptography-0:50.0.0-1.hum1@aarch64 as a component of Red Hat Hardened Images; python3-cryptography-0:50.0.0-1.hum1@x86_64 as a component of Red Hat Hardened Images; and 40 more
- After
- edk2-aarch64 as a component of Red Hat Enterprise Linux 10; edk2-ovmf as a component of Red Hat Enterprise Linux 10; edk2-tools as a component of Red Hat Enterprise Linux 10; edk2-tools-doc as a component of Red Hat Enterprise Linux 10; edk2.src as a component of Red Hat Enterprise Linux 10; mokutil as a component of Red Hat Enterprise Linux 10; openssl as a component of Red Hat Enterprise Linux 10; openssl-devel as a component of Red Hat Enterprise Linux 10; openssl-libs as a component of Red Hat Enterprise Linux 10; openssl-perl as a component of Red Hat Enterprise Linux 10; openssl.src as a component of Red Hat Enterprise Linux 10; shim-aa64 as a component of Red Hat Enterprise Linux 10; shim-unsigned-aarch64.src as a component of Red Hat Enterprise Linux 10; shim-unsigned-x64.src as a component of Red Hat Enterprise Linux 10; shim-x64 as a component of Red Hat Enterprise Linux 10; openssl as a component of Red Hat Enterprise Linux 6; openssl-devel as a component of Red Hat Enterprise Linux 6; openssl-perl as a component of Red Hat Enterprise Linux 6; openssl-static as a component of Red Hat Enterprise Linux 6; openssl.src as a component of Red Hat Enterprise Linux 6; AAVMF as a component of Red Hat Enterprise Linux 7; OVMF as a component of Red Hat Enterprise Linux 7; ovmf.src as a component of Red Hat Enterprise Linux 7; compat-openssl10 as a component of Red Hat Enterprise Linux 8; compat-openssl10.src as a component of Red Hat Enterprise Linux 8; edk2-aarch64 as a component of Red Hat Enterprise Linux 8; edk2-ovmf as a component of Red Hat Enterprise Linux 8; edk2.src as a component of Red Hat Enterprise Linux 8; mingw-openssl.src as a component of Red Hat Enterprise Linux 8; mingw32-openssl as a component of Red Hat Enterprise Linux 8; and 42 more · Fixed: bootupd-0:0.3.2-1.hum1@aarch64 as a component of Red Hat Hardened Images; bootupd-0:0.3.2-1.hum1@x86_64 as a component of Red Hat Hardened Images; chunkah-0:0.6.0-3.hum1@aarch64 as a component of Red Hat Hardened Images; chunkah-0:0.6.0-3.hum1@src as a component of Red Hat Hardened Images; chunkah-0:0.6.0-3.hum1@x86_64 as a component of Red Hat Hardened Images; openssl-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl-0:3.5.8-0.1.hum1@src as a component of Red Hat Hardened Images; openssl-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl-config-fips-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl-config-fips-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl-devel-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl-devel-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl-devel-engine-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl-devel-engine-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl-fips-provider-upstream-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl-fips-provider-upstream-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl-libs-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl-libs-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl-perl-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl-perl-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl3-0:3.5.8-0.1.hum1@src as a component of Red Hat Hardened Images; openssl3-devel-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl3-devel-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl3-devel-engine-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl3-devel-engine-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl3-libs-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl3-libs-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; python-cryptography-0:50.0.0-1.hum1@src as a component of Red Hat Hardened Images; python3-cryptography-0:50.0.0-1.hum1@aarch64 as a component of Red Hat Hardened Images; python3-cryptography-0:50.0.0-1.hum1@x86_64 as a component of Red Hat Hardened Images; and 40 more
- Affected versionsThe structured affected or fixed version information changed.Red Hat Product Security ↗
- Before
- 4.0.0 < 4.0.1; 3.6.0 < 3.6.3 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
- After
- 4.0.0 < 4.0.1; 3.6.0 < 3.6.3 · Fixed: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
- Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-42765 to remediation: access.redhat.com/CVE-2026-42765.Red Hat Product Security ↗
- Before
- remediation: access.redhat.com/CVE-2026-42765
- After
- remediation: access.redhat.com/CVE-2026-42765
- Remediation statusRemediation status changed from Mitigation available to Patch available.Red Hat Product Security ↗
- Before
- Mitigation available
- After
- Patch available
- Affected versionsThe structured affected or fixed version information changed.Red Hat Product Security ↗
- Before
- chunkah.src as a component of Red Hat Hardened Images; openssl.src as a component of Red Hat Hardened Images; openssl3.src as a component of Red Hat Hardened Images; python-cryptography.src as a component of Red Hat Hardened Images; ruby3.3.src as a component of Red Hat Hardened Images; ruby3.4.src as a component of Red Hat Hardened Images; ruby4.0.src as a component of Red Hat Hardened Images; rust-bootupd.src as a component of Red Hat Hardened Images
- After
- Fixed: bootupd-0:0.3.2-1.hum1@aarch64 as a component of Red Hat Hardened Images; bootupd-0:0.3.2-1.hum1@x86_64 as a component of Red Hat Hardened Images; chunkah-0:0.6.0-3.hum1@aarch64 as a component of Red Hat Hardened Images; chunkah-0:0.6.0-3.hum1@src as a component of Red Hat Hardened Images; chunkah-0:0.6.0-3.hum1@x86_64 as a component of Red Hat Hardened Images; openssl-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl-0:3.5.8-0.1.hum1@src as a component of Red Hat Hardened Images; openssl-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl-config-fips-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl-config-fips-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl-devel-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl-devel-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl-devel-engine-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl-devel-engine-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl-fips-provider-upstream-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl-fips-provider-upstream-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl-libs-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl-libs-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl-perl-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl-perl-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl3-0:3.5.8-0.1.hum1@src as a component of Red Hat Hardened Images; openssl3-devel-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl3-devel-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl3-devel-engine-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl3-devel-engine-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; openssl3-libs-0:3.5.8-0.1.hum1@aarch64 as a component of Red Hat Hardened Images; openssl3-libs-0:3.5.8-0.1.hum1@x86_64 as a component of Red Hat Hardened Images; python-cryptography-0:50.0.0-1.hum1@src as a component of Red Hat Hardened Images; python3-cryptography-0:50.0.0-1.hum1@aarch64 as a component of Red Hat Hardened Images; python3-cryptography-0:50.0.0-1.hum1@x86_64 as a component of Red Hat Hardened Images; and 40 more
- Affected versionsThe structured affected or fixed version information changed.Red Hat Product Security ↗
- Before
- chunkah.src as a component of Red Hat Hardened Images; openssl.src as a component of Red Hat Hardened Images; openssl3.src as a component of Red Hat Hardened Images; python-cryptography.src as a component of Red Hat Hardened Images; ruby3.3.src as a component of Red Hat Hardened Images; ruby3.4.src as a component of Red Hat Hardened Images; ruby4.0.src as a component of Red Hat Hardened Images; rust-bootupd.src as a component of Red Hat Hardened Images; unbound.src as a component of Red Hat Hardened Images
- After
- chunkah.src as a component of Red Hat Hardened Images; openssl.src as a component of Red Hat Hardened Images; openssl3.src as a component of Red Hat Hardened Images; python-cryptography.src as a component of Red Hat Hardened Images; ruby3.3.src as a component of Red Hat Hardened Images; ruby3.4.src as a component of Red Hat Hardened Images; ruby4.0.src as a component of Red Hat Hardened Images; rust-bootupd.src as a component of Red Hat Hardened Images
- Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-42765 to remediation: access.redhat.com/CVE-2026-42765.Red Hat Product Security ↗
- Before
- remediation: access.redhat.com/CVE-2026-42765
- After
- remediation: access.redhat.com/CVE-2026-42765
- Remediation statusRemediation status changed from Awaiting fix to Mitigation available.Red Hat Product Security ↗
- Before
- Awaiting fix
- After
- Mitigation available
- Affected versionsThe structured affected or fixed version information changed.Red Hat Product Security ↗
- Before
- After
- chunkah.src as a component of Red Hat Hardened Images; openssl.src as a component of Red Hat Hardened Images; openssl3.src as a component of Red Hat Hardened Images; python-cryptography.src as a component of Red Hat Hardened Images; ruby3.3.src as a component of Red Hat Hardened Images; ruby3.4.src as a component of Red Hat Hardened Images; ruby4.0.src as a component of Red Hat Hardened Images; rust-bootupd.src as a component of Red Hat Hardened Images; unbound.src as a component of Red Hat Hardened Images
CVE published
Fixed release or patch reference recorded
Fixed release recorded from official guidance
Fixed release recorded from official guidance
Technical terms and abbreviations used in this report
- CVE
- Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
- CVSS
- Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
- EPSS
- Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
- CWE
- Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
- CNA
- CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
- CISA ADP
- Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
- NVD
- National Vulnerability Database: NIST's enrichment service for CVE records.
- CERT / CSIRT
- A computer security incident response team that publishes warnings or coordinates incident response.
- PoC
- Proof of concept: public material that demonstrates or helps reproduce exploitation.
- CSAF
- Common Security Advisory Framework: a machine-readable format for security advisories.
- LoTL
- Living off the land: abuse of legitimate tools or system functions during an attack.