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CVE-2026-107373 SMUELLER CVE debrief

CVE-2026-107373 debrief: ExtUtils::Typemaps::STL::String versions before 1.06 for Perl T_STD_STRING typemap may read the SV length before stringifying the argument. This issue arises from the typemap's use of $var = std::string( SvPV_nolen($arg), SvCUR($arg) ), where evaluation order for C++ arguments is unspecified. Some compilers may evaluate SvCUR($arg) first, leading to potential invalid values when $arg is not a string, and consequently, program crashes or segfaults. Defenders should assess exposure and prioritize updates to mitigate potential issues.

Vendor
SMUELLER
Product
ExtUtils-Typemaps-Default
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-10
Original CVE updated
2026-10-10
Advisory published
2026-10-10
Advisory updated
2026-10-10

Who should care

Defenders responsible for Perl applications using ExtUtils-Typemaps-Default should assess exposure and prioritize updates to mitigate potential issues. This includes reviewing typemap usage, verifying versions, and ensuring proper stringification of arguments. Security teams and operators managing Perl applications are particularly impacted.

Why it matters

CVE-2026-107373 affects ExtUtils-Typemaps-Default versions before 1.06, potentially leading to program crashes. Defenders should verify the version in use and update if necessary.

  • Verify version of ExtUtils-Typemaps-Default in use.
  • Update to version 1.06 or later if affected.
  • Review typemap usage in Perl applications.

Technical summary

The ExtUtils::Typemaps::STL::String typemap for Perl's T_STD_STRING may read the SV length before stringifying the argument, potentially leading to invalid values and program crashes. This issue affects versions before 1.06 of ExtUtils-Typemaps-Default. The typemap's implementation, $var = std::string( SvPV_nolen($arg), SvCUR($arg) ), may cause issues due to unspecified evaluation order for C++ arguments. Defenders should prioritize verifying the version of ExtUtils-Typemaps-Default in use and updating to version 1.06 or later if affected.

Defensive priority

Defenders should prioritize verifying the version of ExtUtils-Typemaps-Default in use and updating to version 1.06 or later if affected.

Recommended defensive actions

  • Verify the version of ExtUtils-Typemaps-Default in use and update to version 1.06 or later if affected.
  • Review the typemap usage in Perl applications and ensure proper stringification of arguments.
  • Monitor for potential issues with SvCUR and SvPV_nolen in Perl code.
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record and source item provide limited information about the vulnerability, primarily focusing on technical details. The NVD entry is currently empty. Defenders should verify the version of ExtUtils-Typemaps-Default in use and update to version 1.06 or later if affected. The CVE Program record and NVD detail page offer official metadata and vulnerability assessments. Supplemental sources provide additional context and release notes for version 1.06.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-107373 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-107373

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-107373 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-107373

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.