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.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| SHAY | perl | unaffected |
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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.
Tue, 26 May 2026 00:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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 |
|
Projects
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MITRE
Status: PUBLISHED
Assigner: CPANSec
Published:
Updated: 2026-05-25T23:53:27.812Z
Reserved: 2026-05-12T08:15:41.456Z
Link: CVE-2026-8376
Vulnrichment
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NVD
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Redhat
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OpenCVE Enrichment
Updated: 2026-05-26T01:30:15Z