Evidence used
- No CISA KEV confirmation is currently recorded.
- EPSS is 0.21% for the current model date.
BlackTreeCVE IntelligenceFull vulnerability report · 2026
CVE-2026-57432High confidence
Perl versions before 5.40.5-RC1, from 5.41.0 before 5.42.3-RC1, from 5.43.0 before 5.43.11 have an integer overflow in S_measure_struct leading to an out-of-bounds heap read in pack and unpack
Unknown · Unknown
8.4HighCVSS 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 local access and enforce least privilege on affected hosts.
- Monitor vendor guidance and exploitation sources for a material change.
Verification
- Confirm that the asset runs Unknown Unknown 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
5 package statesRelease-specific package status
Debian, ubuntu 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 | perl | Vendor fix publishedDebian records a fixed source-package version for this release. | 5.40.1-6+deb13u1 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian bookwormbookworm · source | perl | Vendor fix publishedDebian records a fixed source-package version for this release. | 5.36.0-7+deb12u4 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian forkyforky · source | perl | Vendor fix publishedDebian records a fixed source-package version for this release. | 5.40.1-8 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian sidsid · source | perl | Vendor fix publishedDebian records a fixed source-package version for this release. | 5.40.1-8 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Ubuntu 24.04 LTSnoble · standard archive | perl | Vendor fix publishedCanonical reports that a fixed source package version has been published. Repository candidate availability is not checked by BlackTree. | 5.38.2-3.2ubuntu0.4 | Canonical Ubuntu Security ↗Source updated 6 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-2026-57432 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityperl: Perl: Information disclosure via integer overflow in pack/unpack operations
The vendor explicitly identifies these products as affected by this CVE.
- perl as a component of Red Hat Enterprise Linux 10
- perl-Attribute-Handlers as a component of Red Hat Enterprise Linux 10
- perl-AutoLoader as a component of Red Hat Enterprise Linux 10
- perl-AutoSplit as a component of Red Hat Enterprise Linux 10
- perl-B as a component of Red Hat Enterprise Linux 10
- perl-Benchmark as a component of Red Hat Enterprise Linux 10
- perl-Class-Struct as a component of Red Hat Enterprise Linux 10
- perl-Config-Extensions as a component of Red Hat Enterprise Linux 10
- perl-DBM_Filter as a component of Red Hat Enterprise Linux 10
- perl-Devel-Peek as a component of Red Hat Enterprise Linux 10
- perl-Devel-SelfStubber as a component of Red Hat Enterprise Linux 10
- perl-DirHandle as a component of Red Hat Enterprise Linux 10
- Summary
- A flaw was found in Perl. An integer overflow vulnerability in the `S_measure_struct` function, specifically when handling `pack` and `unpack` templates with large repeat counts, can lead to an out-of-bounds heap read. This allows an attacker, by providing a specially crafted template, to read sensitive information from memory beyond the intended buffer. This could result in the disclosure of confidential data.
- 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
Perl versions before 5.40.5-RC1, from 5.41.0 before 5.42.3-RC1, from 5.43.0 before 5.43.11 have an integer overflow in S_measure_struct leading to an out-of-bounds heap read in pack and unpack. S_measure_struct adds each item's size times its repeat count to a running total with no overflow check, so a large repeat count in a pack or unpack template wraps the signed SSize_t total negative. The @, X, and x position codes then guard their moves with a signed length comparison that passes when the length is negative, advancing the buffer pointer out of bounds. A template derived from untrusted input can read heap memory past the buffer and return it to the caller.
What
Perl versions before 5.40.5-RC1, from 5.41.0 before 5.42.3-RC1, from 5.43.0 before 5.43.11 have an integer overflow in S_measure_struct leading to an out-of-bounds heap read in pack and unpack. S_measure_struct adds each item's size times its repeat count to a running total with no overflow check, so a large repeat count in a pack or unpack template wraps the signed SSize_t total negative. The @, X, and x position codes then guard their moves with a signed length comparison that passes when the length is negative, advancing the buffer pointer out of bounds. A template derived from untrusted input can read heap memory past the buffer and return it to the caller.
Why
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
How
An attacker operating through local access 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
Perl versions before 5.40.5-RC1, from 5.41.0 before 5.42.3-RC1, from 5.43.0 before 5.43.11 have an integer overflow in S_measure_struct leading to an out-of-bounds heap read in pack and unpack. S_measure_struct adds each item's size times its repeat count to a running total with no overflow check, so a large repeat count in a pack or unpack template wraps the signed SSize_t total negative. The @, X, and x position codes then guard their moves with a signed length comparison that passes when the length is negative, advancing the buffer pointer out of bounds. A template derived from untrusted input can read heap memory past the buffer and return it to the caller.
Why
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
How
An attacker operating through local access 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
- local access → Integer Overflow or Wraparound → cause the confidentiality, integrity or availability impact described by the vendor
- Attack surface
- Local
- 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-190 ↗
CWE-190: Integer Overflow or Wraparound. The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
- CVSS vector
?
CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity. CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HCommon Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVLocalAttack vector: The attacker needs local access to the vulnerable system.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.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.- Post-exploitation / living off the land
- The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
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
- perl as a component of Red Hat Enterprise Linux 10
- perl-Attribute-Handlers as a component of Red Hat Enterprise Linux 10
- perl-AutoLoader as a component of Red Hat Enterprise Linux 10
- perl-AutoSplit as a component of Red Hat Enterprise Linux 10
- perl-B as a component of Red Hat Enterprise Linux 10
- perl-Benchmark as a component of Red Hat Enterprise Linux 10
- perl-Class-Struct as a component of Red Hat Enterprise Linux 10
- perl-Config-Extensions as a component of Red Hat Enterprise Linux 10
- perl-DBM_Filter as a component of Red Hat Enterprise Linux 10
- perl-Devel-Peek as a component of Red Hat Enterprise Linux 10
- perl-Devel-SelfStubber as a component of Red Hat Enterprise Linux 10
- perl-DirHandle as a component of Red Hat Enterprise Linux 10
- perl-Dumpvalue as a component of Red Hat Enterprise Linux 10
- perl-DynaLoader as a component of Red Hat Enterprise Linux 10
- perl-English as a component of Red Hat Enterprise Linux 10
- perl-Errno as a component of Red Hat Enterprise Linux 10
- perl-ExtUtils-Constant as a component of Red Hat Enterprise Linux 10
- perl-ExtUtils-Embed as a component of Red Hat Enterprise Linux 10
- perl-ExtUtils-Miniperl as a component of Red Hat Enterprise Linux 10
- perl-Fcntl as a component of Red Hat Enterprise Linux 10
- perl-File-Basename as a component of Red Hat Enterprise Linux 10
- perl-File-Compare as a component of Red Hat Enterprise Linux 10
- perl-File-Copy as a component of Red Hat Enterprise Linux 10
- perl-File-DosGlob as a component of Red Hat Enterprise Linux 10
- perl-File-Find as a component of Red Hat Enterprise Linux 10
- perl-File-stat as a component of Red Hat Enterprise Linux 10
- perl-FileCache as a component of Red Hat Enterprise Linux 10
- perl-FileHandle as a component of Red Hat Enterprise Linux 10
- perl-FindBin as a component of Red Hat Enterprise Linux 10
- perl-GDBM_File as a component of Red Hat Enterprise Linux 10
- and 296 more
- Fixed
- 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. Limit untrusted access and use least privilege until authoritative guidance is available.
04
Evidence and provenance
Published 13 Jul 2026 · Last source change 8 Sept 2026, 21:32 UTC · CWE-190 · Integer Overflow or Wraparound
CVE recordCVE.org · 5.2
CVSS sourceNIST NVD
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-2026-43502
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD modified after enrichment
Missing structured fields: affected product. Missing data is not evidence of low risk; review the primary advisory.
Material change intelligence
View recent updates ↗What changed after publication
- Affected versionsThe structured affected or fixed version information changed.CNA ↗
- Before
- perl: ≤ 5.43.10 · Fixed: Apply the upstream patches. The fix is included in the Perl 5.43.11 development release.
- After
- < 5.40.5-RC1, 5.41.0 < 5.42.3-RC1, 5.43.0 < 5.43.11 · Fixed: Upgrade to Perl 5.40.5, 5.42.3 or 5.44.0 or later, or apply the upstream patches.
- Affected versionsThe structured affected or fixed version information changed.CNA ↗
- Before
- ≤ 5.43.10 · 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
- < 5.40.5-RC1; 5.41.0 < 5.42.3-RC1; 5.43.0 < 5.43.11 · 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.
- Affected versionsThe structured affected or fixed version information changed.Red Hat Product Security ↗
- Before
- perl as a component of Red Hat Enterprise Linux 10; perl-Attribute-Handlers as a component of Red Hat Enterprise Linux 10; perl-AutoLoader as a component of Red Hat Enterprise Linux 10; perl-AutoSplit as a component of Red Hat Enterprise Linux 10; perl-B as a component of Red Hat Enterprise Linux 10; perl-Benchmark as a component of Red Hat Enterprise Linux 10; perl-Class-Struct as a component of Red Hat Enterprise Linux 10; perl-Config-Extensions as a component of Red Hat Enterprise Linux 10; perl-DBM_Filter as a component of Red Hat Enterprise Linux 10; perl-Devel-Peek as a component of Red Hat Enterprise Linux 10; perl-Devel-SelfStubber as a component of Red Hat Enterprise Linux 10; perl-DirHandle as a component of Red Hat Enterprise Linux 10; perl-Dumpvalue as a component of Red Hat Enterprise Linux 10; perl-DynaLoader as a component of Red Hat Enterprise Linux 10; perl-English as a component of Red Hat Enterprise Linux 10; perl-Errno as a component of Red Hat Enterprise Linux 10; perl-ExtUtils-Constant as a component of Red Hat Enterprise Linux 10; perl-ExtUtils-Embed as a component of Red Hat Enterprise Linux 10; perl-ExtUtils-Miniperl as a component of Red Hat Enterprise Linux 10; perl-Fcntl as a component of Red Hat Enterprise Linux 10; perl-File-Basename as a component of Red Hat Enterprise Linux 10; perl-File-Compare as a component of Red Hat Enterprise Linux 10; perl-File-Copy as a component of Red Hat Enterprise Linux 10; perl-File-DosGlob as a component of Red Hat Enterprise Linux 10; perl-File-Find as a component of Red Hat Enterprise Linux 10; perl-File-stat as a component of Red Hat Enterprise Linux 10; perl-FileCache as a component of Red Hat Enterprise Linux 10; perl-FileHandle as a component of Red Hat Enterprise Linux 10; perl-FindBin as a component of Red Hat Enterprise Linux 10; perl-GDBM_File as a component of Red Hat Enterprise Linux 10; and 295 more · Fixed: perl-main@aarch64 as a component of Red Hat Hardened Images; perl-main@noarch as a component of Red Hat Hardened Images; perl-main@src as a component of Red Hat Hardened Images; perl-main@x86_64 as a component of Red Hat Hardened Images
- After
- perl as a component of Red Hat Enterprise Linux 10; perl-Attribute-Handlers as a component of Red Hat Enterprise Linux 10; perl-AutoLoader as a component of Red Hat Enterprise Linux 10; perl-AutoSplit as a component of Red Hat Enterprise Linux 10; perl-B as a component of Red Hat Enterprise Linux 10; perl-Benchmark as a component of Red Hat Enterprise Linux 10; perl-Class-Struct as a component of Red Hat Enterprise Linux 10; perl-Config-Extensions as a component of Red Hat Enterprise Linux 10; perl-DBM_Filter as a component of Red Hat Enterprise Linux 10; perl-Devel-Peek as a component of Red Hat Enterprise Linux 10; perl-Devel-SelfStubber as a component of Red Hat Enterprise Linux 10; perl-DirHandle as a component of Red Hat Enterprise Linux 10; perl-Dumpvalue as a component of Red Hat Enterprise Linux 10; perl-DynaLoader as a component of Red Hat Enterprise Linux 10; perl-English as a component of Red Hat Enterprise Linux 10; perl-Errno as a component of Red Hat Enterprise Linux 10; perl-ExtUtils-Constant as a component of Red Hat Enterprise Linux 10; perl-ExtUtils-Embed as a component of Red Hat Enterprise Linux 10; perl-ExtUtils-Miniperl as a component of Red Hat Enterprise Linux 10; perl-Fcntl as a component of Red Hat Enterprise Linux 10; perl-File-Basename as a component of Red Hat Enterprise Linux 10; perl-File-Compare as a component of Red Hat Enterprise Linux 10; perl-File-Copy as a component of Red Hat Enterprise Linux 10; perl-File-DosGlob as a component of Red Hat Enterprise Linux 10; perl-File-Find as a component of Red Hat Enterprise Linux 10; perl-File-stat as a component of Red Hat Enterprise Linux 10; perl-FileCache as a component of Red Hat Enterprise Linux 10; perl-FileHandle as a component of Red Hat Enterprise Linux 10; perl-FindBin as a component of Red Hat Enterprise Linux 10; perl-GDBM_File as a component of Red Hat Enterprise Linux 10; and 296 more · Fixed: perl-main@aarch64 as a component of Red Hat Hardened Images; perl-main@noarch as a component of Red Hat Hardened Images; perl-main@src as a component of Red Hat Hardened Images; perl-main@x86_64 as a component of Red Hat Hardened Images
- Affected versionsThe structured affected or fixed version information changed.CNA ↗
- Before
- < 5.40.5-RC1; 5.41.0 < 5.42.3-RC1; 5.43.0 < 5.43.11 · 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
- perl: ≤ 5.43.10 · Fixed: Apply the upstream patches. The fix is included in the Perl 5.43.11 development release.
CVE published
Fixed release or patch reference recorded
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.