CPANSA-perl-2026-13221: perl vulnerability
| Publisher |
giterlizzi |
Document category |
csaf_security_advisory |
| Initial release date |
2026-07-13T00:00:00 |
Engine |
CSAF Perl Toolkit 0.26 |
| Current release date |
2026-07-13T00:00:00 |
Build Date |
|
| Current version |
1 |
Status |
final |
| CVSS v3.1 Base Score |
9.1
|
Severity |
|
| Original language |
|
Language |
en |
| Also referred to |
|
Vulnerability Description
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.
Vulnerabilities
CVE-2026-13221
Vulnerability DescriptionPerl 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.
| Weakness |
CWE-190 : Integer Overflow or Wraparound
|
Product status
Known affected
| Product |
Score |
| perl greater than 0 and less than 5.40.5 |
|
| perl greater than or equal 5.41.0 and less than 5.42.3 |
|
| perl greater than or equal 5.43.0 and less than 5.43.10 |
|
Fixed
- perl greater than or equal 5.40.5 and less than 5.43.10
- perl greater than or equal 5.42.3 and less than 5.43.0
- perl greater than or equal 5.43.10
giterlizzi
Namespace: https://github.com/giterlizzi/
gdt@cpan.org
References
Revision history
| Version |
Date of the revision |
Summary of the revision |
| 1 |
Mon Jul 13 00:00:00 2026 |
First release |
Sharing rules
TLP:WHITE
For the TLP version see: https://www.first.org/tlp/