CVE-2026-8376
Perl versions through 5.43.10 have a heap buffer overflow when compiling regular expressions with a repeated fixed string on 32-bit builds
Description
Perl versions through 5.43.10 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.
INFO
Published Date :
May 25, 2026, 11:53 p.m.
Last Modified :
May 25, 2026, 11:53 p.m.
Remotely Exploit :
No
Source :
CPANSec
Affected Products
The following products are affected by CVE-2026-8376
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update Perl to a version later than 5.43.10.
- Ensure builds are not 32-bit if using vulnerable versions.
- Avoid compiling untrusted regular expressions.
- Recompile affected Perl modules.
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CVE-2026-8376 vulnerability anywhere in the article.