CVE-2026-8376

Summary

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 a heap buffer overflow when compiling regular expressions with a repeated fixed string on 32-bit builds.

Perl_study_chunk in regcomp_study.c checked the size of the joined substring buffer in characters rather than bytes. For a quantified fixed substring with a large minimum count, the byte length mincount * l could overflow SSize_t, producing an undersized SvGROW allocation; the subsequent copy writes past the end of the buffer.

A caller that compiles an attacker-controlled regular expression on a 32-bit perl build triggers a heap buffer overflow at compile time.

Affected Software

VendorProductVersion RangeStatus
0 < 5.40.5-RC1affected
5.41.0 < 5.42.3-RC1affected
5.43.0 < 5.43.11affected

Weaknesses

  • CWE-680: CWE-680 Integer Overflow to Buffer Overflow

Workarounds

On 32-bit perl builds, avoid compiling regular expressions from untrusted input until a fixed release is installed.

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: partial

References