CVE-2026-13221 Affecting miniperl-5.38 package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-MINIMOSLATEST-MINIPERL538-18020468
- published20 Jul 2026
- disclosed13 Jul 2026
Introduced: 13 Jul 2026
NewCVE-2026-13221 (opens in a new tab)How to fix?
There is no fixed version for Minimos:latest miniperl-5.38.
NVD Description
Note: Versions mentioned in the description apply only to the upstream miniperl-5.38 package and not the miniperl-5.38 package as distributed by Minimos.
See How to fix? for Minimos:latest relevant fixed versions and status.
Perl versions through 5.43.9 produce silently incorrect regular expression matches when an alternation of more than 65535 fixed string branches is compiled into a trie in Perl_study_chunk.
When such branches are combined into a trie, the delta between the first branch and the shared tail is stored in a 16-bit field. A branch count above 65535 overflows the field, and the trie's match decision table is truncated with no warning or error.
A pattern of this shape produces false positive matches (matching strings it should not) and false negative matches (failing to match strings it should). When such a pattern gates an access or filtering decision, the result is wrong.
References
- https://www.cve.org/CVERecord?id=CVE-2026-13221
- https://github.com/advisories/GHSA-whhx-pv66-xhgq
- https://osv.dev/vulnerability/MINI-h79w-p96m-84m7
- https://osv.dev/vulnerability/CVE-2026-13221
- https://github.com/Perl/perl5/commit/03f74bbbd3a68350d926ee93d56ee4808c28c4c7.patch
- https://github.com/Perl/perl5/issues/23388
- http://www.openwall.com/lists/oss-security/2026/07/13/5