PatchTheCVECVE-2026-15534: Perl versions through 5.45.1 have out-of-bounds heap reads and writes during regular expression matching via a
CVE-2026-15534 is a medium-severity flaw (CVSS 5.7) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Perl versions through 5.45.1 have out-of-bounds heap reads and writes during regular expression matching via an undersized superlinear cache in S_regmatch. The regex engine's superlinear cache holds one bit per subject position for each participating WHILEM node, so the bit count is the subject length plus one times the number of nodes. Nothing checks that product for positive overflow of the signed 32-bit count: a 286331153 byte subject matched
Why this priority
- No elevated risk signals yet
No fix is published yet: follow the downgrade or mitigation steps.
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-15534?
No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.
Is CVE-2026-15534 being exploited?
CVE-2026-15534 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-15534 affect?
CVE-2026-15534 affects affected software. Severity is medium (CVSS 5.7). Perl versions through 5.45.1 have out-of-bounds heap reads and writes during regular expression matching via an undersized superlinear cache in S_regmatch. The regex engine's superlinear cache holds one bit per subject position for each pa
How urgent is CVE-2026-15534?
Priority 24/100. No elevated risk signals yet.