Perl: community verdicts

2 notable / known-exploited Perl CVEs the community has triaged.

ⓘ Not an exhaustive list: we focus on the findings that matter (exploited / notable). For every Perl CVE, see NVD ↗.

Tracked Perl CVEs by year published2 tracked · select a year for details

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Year published	CVEs	In CISA KEV
2023	1	0
2024	0	0
2025	0	0
2026	1	0

Exploitation first, with newly exploited CVEs rising above old ones

CVE-2026-8376CRIT 9.8Real · low riskEPSS 0%
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.
CVE-2023-31486HIGH 8.1Real · low riskEPSS 2%
HTTP::Tiny before 0.083, a Perl core module since 5.13.9 and available standalone on CPAN, has an insecure default TLS configuration where users must opt in to verify certificates.