CVE details
CVE-2026-8376
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 ports (2)
| Port | Package | Version | Status | Maintainer |
|---|---|---|---|---|
| lang/perl5.40 | perl5.40 | 5.40.5 | unaddressed | mat@FreeBSD.org |
| lang/perl5.42 | perl5 | 5.42.3 | unaddressed | mat@FreeBSD.org |
Template for a VuXML entry
Range taken from the CVE record, check it before committing. make newentry in security/vuxml creates the vid.
<vuln vid="FIXME (make newentry)">
<topic>FIXME -- FIXME</topic>
<affects>
<package>
<name>perl5.40</name>
<range><lt>FIXME</lt></range>
</package>
<package>
<name>perl5</name>
<range><lt>FIXME</lt></range>
</package>
</affects>
<description>
<body xmlns="http://www.w3.org/1999/xhtml">
<p>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.</p>
</body>
</description>
<references>
<cvename>CVE-2026-8376</cvename>
<url>https://nvd.nist.gov/vuln/detail/CVE-2026-8376</url>
</references>
<dates>
<discovery>2026-05-26</discovery>
<entry>2026-10-25</entry>
</dates>
</vuln>