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.
No advisories yet.
Solution
Upgrade to a future perl release, or apply the upstream patch.
Workaround
On 32-bit perl builds, avoid compiling regular expressions from untrusted input until a fixed release is installed.
Wed, 27 May 2026 19:30:00 +0000
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cvssV3_1
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ssvc
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Wed, 27 May 2026 18:45:00 +0000
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Perl
Perl perl |
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| CPEs | cpe:2.3:a:perl:perl:*:*:*:*:*:*:*:* | |
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Perl
Perl perl |
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| Metrics |
cvssV3_1
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Tue, 26 May 2026 13:45:00 +0000
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Tue, 26 May 2026 03:15:00 +0000
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Shay
Shay perl |
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Shay
Shay perl |
Tue, 26 May 2026 00:15:00 +0000
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| 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. | |
| Title | Perl versions through 5.43.10 have a heap buffer overflow when compiling regular expressions with a repeated fixed string on 32-bit builds | |
| Weaknesses | CWE-680 | |
| References |
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Projects
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Status: PUBLISHED
Assigner: CPANSec
Published:
Updated: 2026-05-27T18:04:00.329Z
Reserved: 2026-05-12T08:15:41.456Z
Link: CVE-2026-8376
Updated: 2026-05-26T03:06:00.816Z
Status : Modified
Published: 2026-05-26T00:16:57.150
Modified: 2026-05-27T19:16:24.767
Link: CVE-2026-8376
No data.
OpenCVE Enrichment
Updated: 2026-05-26T03:00:13Z