CVE-2026-57432

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 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.

Affected Software

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

Weaknesses

  • CWE-190: CWE-190 Integer Overflow or Wraparound
  • CWE-125: CWE-125 Out-of-bounds Read

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References