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 0.26% for the current model date.
BlackTreeCVE IntelligenceFull vulnerability report · 2026
CVE-2026-90439High confidence
NGINX ngx_http_v3_module vulnerability
F5 · NGINX Plus
Official source article: F5 K000162604 ↗. Check the applicable product and release in the original source.
6.9MediumCVSS 4.0
Scheduled
Patch availableMedium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.
R
Open reassessment dashboard →Operational reassessment
Published severity in operational context
Published severityMedium→Operational priority:Medium, 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 F5 NGINX Plus 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 | nginx | Not affectedDebian marks this release not affected (fixed-version marker 0). | Not published in this feed | Debian Security Tracker ↗Source updated 7 Oct 2026 |
| Debian bookwormbookworm · source | nginx | Not affectedDebian marks this release not affected (fixed-version marker 0). | Not published in this feed | Debian Security Tracker ↗Source updated 7 Oct 2026 |
| Debian forkyforky · source | nginx | Vendor fix publishedDebian records a fixed source-package version for this release. | 1.30.4-7 | Debian Security Tracker ↗Source updated 7 Oct 2026 |
| Debian sidsid · source | nginx | Vendor fix publishedDebian records a fixed source-package version for this release. | 1.30.4-7 | Debian Security Tracker ↗Source updated 7 Oct 2026 |
Direct vendor intelligence
2 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-2026-90439 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitynginx: NGINX ngx_http_v3_module: Denial of Service via TLS handshake heap buffer overflow
The vendor explicitly identifies these products as affected by this CVE.
- openshift/ose-rhel-coreos-8 as a component of Red Hat OpenShift Container Platform 4
- openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4
- Summary
- A flaw was found in NGINX ngx_http_v3_module. A limited heap buffer overflow can occur during a Transport Layer Security (TLS) handshake when using HTTP/3 with certain OpenSSL versions. This vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system. Additionally, it could lead to limited data corruption.
- Remediation
- For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
CVE-2026-90439 · CSAF 2.0 · revision 4 · interimSUSE Product Security TeamCVE-2026-90439
The vendor explicitly identifies these products as affected by this CVE.
- nginx as component of SUSE Linux Enterprise High Performance Computing 15 SP1
- nginx-source as component of SUSE Linux Enterprise High Performance Computing 15 SP1
- nginx as component of SUSE Linux Enterprise High Performance Computing 15 SP2
- nginx-source as component of SUSE Linux Enterprise High Performance Computing 15 SP2
- nginx as component of SUSE Linux Enterprise High Performance Computing 15 SP3
- nginx-source as component of SUSE Linux Enterprise High Performance Computing 15 SP3
- nginx as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS
- nginx-source as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS
- nginx as component of SUSE Linux Enterprise High Performance Computing 15 SP4
- nginx-source as component of SUSE Linux Enterprise High Performance Computing 15 SP4
- nginx as component of SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS
- nginx-source as component of SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS
- Summary
- NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_v3_module module. When using HTTP/3 with OpenSSL versions <= OpenSSL 3.5.0 under certain configurations, a limited heap buffer overflow could happen while processing a TLS handshake. This can happen in a non-deterministic manner that is beyond the attacker's control. This may cause a heap buffer overflow in the NGINX worker process leading to a restart and/or limited data corruption. Impact: This vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system or limited data corruption. There is no control plane exposure; this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
- Remediation
- To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.
Patch available01
What, why and how
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_v3_module module. When using HTTP/3 with OpenSSL versions <= OpenSSL 3.5.0 under certain configurations, a limited heap buffer overflow could happen while processing a TLS handshake. This can happen in a non-deterministic manner that is beyond the attacker's control. This may cause a heap buffer overflow in the NGINX worker process leading to a restart and/or limited data corruption. Impact: This vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system or limited data corruption. There is no control plane exposure; this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
What
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_v3_module module. When using HTTP/3 with OpenSSL versions <= OpenSSL 3.5.0 under certain configurations, a limited heap buffer overflow could happen while processing a TLS handshake. This can happen in a non-deterministic manner that is beyond the attacker's control. This may cause a heap buffer overflow in the NGINX worker process leading to a restart and/or limited data corruption. Impact: This vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system or limited data corruption. There is no control plane exposure; this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Why
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
How
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
What
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_v3_module module. When using HTTP/3 with OpenSSL versions <= OpenSSL 3.5.0 under certain configurations, a limited heap buffer overflow could happen while processing a TLS handshake. This can happen in a non-deterministic manner that is beyond the attacker's control. This may cause a heap buffer overflow in the NGINX worker process leading to a restart and/or limited data corruption. Impact: This vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system or limited data corruption. There is no control plane exposure; this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Why
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
How
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
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 → Heap-based Buffer Overflow → cause the confidentiality, integrity or availability impact described by the vendor
- Attack surface
- Network
- Privileges required
- None: unauthenticated exploitation is possible
- User interaction
- None
- Attack complexity
- Low: no specialised conditions are recorded
- Security boundary
- Not a CVSS 4.0 base metric
- Weakness
?
CWE means Common Weakness Enumeration: a standard category for the underlying weakness. - CWE-122 ↗
CWE-122: Heap-based Buffer Overflow. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
- CVSS vector
?
CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity. CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:NCommon Vulnerability Scoring System 4.0: 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.ATNoneAttack requirements: No additional deployment or execution condition is required.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.VCNoneVulnerable-system confidentiality: No direct loss is represented by this metric.VILowVulnerable-system integrity: A successful attack can cause a limited loss.VALowVulnerable-system availability: A successful attack can cause a limited loss.SCNoneSubsequent-system confidentiality: No direct loss is represented by this metric.SINoneSubsequent-system integrity: No direct loss is represented by this metric.SANoneSubsequent-system availability: No direct loss is represented by this metric.- 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
- Fixed
- nginx-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images
- nginx-0:1.30.5-4.hum1@src as a component of Red Hat Hardened Images
- nginx-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images
- nginx-all-modules-0:1.30.5-4.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images
- nginx-all-modules-0:1.30.5-4.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images
- nginx-core-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images
- nginx-core-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images
- nginx-filesystem-0:1.30.5-4.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images
- nginx-filesystem-0:1.30.5-4.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images
- nginx-mod-devel-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images
- nginx-mod-devel-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images
- nginx-mod-http-geoip-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images
- nginx-mod-http-geoip-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images
- nginx-mod-http-image-filter-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images
- nginx-mod-http-image-filter-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images
- nginx-mod-http-perl-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images
- nginx-mod-http-perl-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images
- nginx-mod-http-xslt-filter-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images
- nginx-mod-http-xslt-filter-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images
- nginx-mod-mail-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images
- nginx-mod-mail-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images
- nginx-mod-stream-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images
- nginx-mod-stream-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images
- nginx-mod-stream-geoip-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images
- nginx-mod-stream-geoip-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images
- 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 15 Sept 2026 · Last source change 16 Sept 2026, 15:09 UTC · CWE-122 · Heap-based Buffer Overflow
CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source FIRST · tracked since 2026-09-16
?
The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.European sourceENISA EUVD · EUVD-2026-78585
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD awaiting enrichment
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
- php.src as a component of Red Hat Hardened Images; openshift/ose-rhel-coreos-8 as a component of Red Hat OpenShift Container Platform 4; openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4 · Fixed: nginx-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images; nginx-0:1.30.5-4.hum1@src as a component of Red Hat Hardened Images; nginx-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images; nginx-all-modules-0:1.30.5-4.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; nginx-all-modules-0:1.30.5-4.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; nginx-core-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images; nginx-core-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images; nginx-filesystem-0:1.30.5-4.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; nginx-filesystem-0:1.30.5-4.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; nginx-mod-devel-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images; nginx-mod-devel-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images; nginx-mod-http-geoip-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images; nginx-mod-http-geoip-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images; nginx-mod-http-image-filter-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images; nginx-mod-http-image-filter-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images; nginx-mod-http-perl-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images; nginx-mod-http-perl-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images; nginx-mod-http-xslt-filter-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images; nginx-mod-http-xslt-filter-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images; nginx-mod-mail-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images; nginx-mod-mail-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images; nginx-mod-stream-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images; nginx-mod-stream-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images; nginx-mod-stream-geoip-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images; nginx-mod-stream-geoip-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images
- After
- openshift/ose-rhel-coreos-8 as a component of Red Hat OpenShift Container Platform 4; openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4 · Fixed: nginx-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images; nginx-0:1.30.5-4.hum1@src as a component of Red Hat Hardened Images; nginx-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images; nginx-all-modules-0:1.30.5-4.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; nginx-all-modules-0:1.30.5-4.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; nginx-core-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images; nginx-core-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images; nginx-filesystem-0:1.30.5-4.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; nginx-filesystem-0:1.30.5-4.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; nginx-mod-devel-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images; nginx-mod-devel-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images; nginx-mod-http-geoip-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images; nginx-mod-http-geoip-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images; nginx-mod-http-image-filter-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images; nginx-mod-http-image-filter-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images; nginx-mod-http-perl-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images; nginx-mod-http-perl-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images; nginx-mod-http-xslt-filter-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images; nginx-mod-http-xslt-filter-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images; nginx-mod-mail-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images; nginx-mod-mail-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images; nginx-mod-stream-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images; nginx-mod-stream-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images; nginx-mod-stream-geoip-0:1.30.5-4.hum1@aarch64 as a component of Red Hat Hardened Images; nginx-mod-stream-geoip-0:1.30.5-4.hum1@x86_64 as a component of Red Hat Hardened Images
- Affected versionsThe structured affected or fixed version information changed.Red Hat Product Security ↗
- Before
- NGINX Plus: 37.1.0.1 < 37.1.1.2, 37.0.0.1 < 37.0.6.2; NGINX Open Source: 1.29.2 < 1.31.6, 1.30.4 < 1.30.5 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
- After
- NGINX Plus: 37.1.0.1 < 37.1.1.2, 37.0.0.1 < 37.0.6.2; NGINX Open Source: 1.29.2 < 1.31.6, 1.30.4 < 1.30.5 · Fixed: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
- Remediation statusRemediation status changed from Awaiting fix to Patch available.Red Hat Product Security ↗
- Before
- Awaiting fix
- After
- Patch available
- Affected versionsThe structured affected or fixed version information changed.CNA ↗
- Before
- NGINX Plus: 37.1.0.1 < 37.1.1.1, 37.0.0.1 < 37.0.6.1; NGINX Open Source: 1.29.2 < 1.31.6, 1.30.4 < 1.30.5 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
- After
- NGINX Plus: 37.1.0.1 < 37.1.1.2, 37.0.0.1 < 37.0.6.2; NGINX Open Source: 1.29.2 < 1.31.6, 1.30.4 < 1.30.5 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
- ENISA EUVD mappingEUVD-2026-78585 was added to the official ENISA EUVD mapping for this CVE.ENISA EUVD ↗
- Before
- not recorded
- After
- {"euvdId":"EUVD-2026-78585"}
- Catalogue recordCVE added to the BlackTree catalogue.CNA ↗
CVE published
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.