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TI-2026-70526 Aliases CVE-2026-107794GHSA-h5wv-6qvp-x98v

Integer underflow in ExtUtils::Typemaps::STL::List exhausts memory

Priority LOW 39CWE-191Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-191 and the CVSS impact.

Summary

ExtUtils::Typemaps::STL::List for Perl versions before 1.07 is affected. Its OUTPUT typemaps compute a length that underflows (CWE-191) on an empty list, so av_extend allocates an array with 2^32 slots and exhausts memory. A remote attacker with no privileges and no user interaction can trigger this denial of service.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

ExtUtils::Typemaps::STL::List versions before 1.07 for Perl allocate a 32 GiB array on an empty list. The OUTPUT typemaps call av_extend( av, len-1 ). On an empty list, this undeflows, and av_extend will allocate an array with 2^32 slots, leading to memory exhaustion. Note that a similar issue was fixed in ExtUtils::Typemaps::STL::Vector version 1.05.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00361 30th percentileScored 2026-11-07
Fix Fixed ExtUtils-Typemaps-Default: 1.07

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
—ExtUtils-Typemaps-Defaultbefore 1.071.07Patch availableCNA
  • ExtUtils-Typemaps-Default Vendor— Affected before 1.07 Fixed in 1.07 Patch available CNA

Remediation

Upgrade ExtUtils::Typemaps::STL::List to version 1.07 or later, which fixes this flaw. The sources list no advisory identifier for this fix.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA ExtUtils-Typemaps-Default Fixed in 1.07

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-11 Threatist record created from CVE-2026-107794
  2. 2026-10-11 Alias added: GHSA-h5wv-6qvp-x98v
  3. 2026-10-13 Affected versions changed · Red Hat
  4. 2026-10-13 CVSS score added · Red Hat
  5. 2026-10-18 CVSS score added · CISA ADP
  6. 2026-10-18 CISA SSVC decision points changed

References

Other 3

Sources

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