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. 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.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/Perl/perl5/commit/5e7f119eb2bb1181be908701f22bf7068e722f1c.patch	Patch
http://www.openwall.com/lists/oss-security/2026/05/26/1	Mailing List Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:perl:perl:*:*:*:*:*:*:*:*

History

27 May 2026, 18:43

Type	Values Removed	Values Added
CPE		cpe:2.3:a:perl:perl::::::::
First Time		Perl perl Perl
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 9.8
References	~~() https://github.com/Perl/perl5/commit/5e7f119eb2bb1181be908701f22bf7068e722f1c.patch -~~	() https://github.com/Perl/perl5/commit/5e7f119eb2bb1181be908701f22bf7068e722f1c.patch - Patch
References	~~() http://www.openwall.com/lists/oss-security/2026/05/26/1 -~~	() http://www.openwall.com/lists/oss-security/2026/05/26/1 - Mailing List, Third Party Advisory

26 May 2026, 04:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-05-26 00:16

Updated : 2026-05-27 19:16

NVD link : CVE-2026-8376

Mitre link : CVE-2026-8376

CVE.ORG link : CVE-2026-8376

JSON object : View

Products Affected

perl

perl

CWE

CWE-680

Integer Overflow to Buffer Overflow

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