Affected: AlmaLinux:9: perl, AlmaLinux:9: perl-Attribute-Handlers, AlmaLinux:9: perl-AutoLoader, AlmaLinux:9: perl-AutoSplit, AlmaLinux:9: perl-B, AlmaLinux:9: perl-Benchmark, AlmaLinux:9: perl-Class-Struct, AlmaLinux:9: perl-Config-Extensions, AlmaLinux:9: perl-DBM_Filter, AlmaLinux:9: perl-Devel-Peek and 90 more

Perl is a high-level programming language that is commonly used for system administration utilities and web programming.

Security Fix(es):

* perl: Perl: Incorrect regular expression processing via large regular expressions (CVE-2026-13221)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Perl versions before 5.40.5-RC1, from 5.41.0 before 5.42.3-RC1, from 5.43.0 before 5.43.10 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.

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.

Affected: openEuler:24.03-LTS-SP1: perl

Perl 5 is a highly capable, feature-rich programming language with over 30 years of development. Perl 5 runs on over 100 platforms from portables to mainframes and is suitable for both rapid prototyping and large scale development projects. Security Fix(es):

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.(CVE-2026-13221)

Security update for perl

perl: Perl: Incorrect regular expression processing via large regular expressions perl: Perl: Information disclosure via integer overflow in pack/unpack operations

Affected: Rocky Linux:9: perl

Perl is a high-level programming language that is commonly used for system administration utilities and web programming.

Security Fix(es):

* perl: Perl: Incorrect regular expression processing via large regular expressions (CVE-2026-13221)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Security update for perl

Affected: Ubuntu:Pro:14.04:LTS: perl, Ubuntu:Pro:16.04:LTS: perl, Ubuntu:Pro:18.04:LTS: perl, Ubuntu:Pro:20.04:LTS: perl, Ubuntu:22.04:LTS: perl, Ubuntu:24.04:LTS: perl, Ubuntu:26.04:LTS: perl

Perl versions before 5.40.5-RC1, from 5.41.0 before 5.42.3-RC1, from 5.43.0 before 5.43.10 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.

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Perl ausnutzen, um einen Denial of Service Angriff durchzuführen oder vertrauliche Informationen offenzulegen.