HTTP::Headers::ActionPack versions before 0.10 for Perl allow CPU exhaustion via Accept-Language ranges matched as regular expressions
What fixes it
- 0.10CVE List
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
Reports 3
3 outlets mention it. Reports are not confirmation; each links to its source.
- 🚨 CVE-2026-113877 HTTP::Headers::ActionPack versions before 0.10 for Perl allow CPU exhaustion via Accept-Language ranges matched as regular expressions. _language_match interpolates each Accept-LanguTelegram: CVE Notify, 23 Oct 2026
- @infosec.skyfleet.blue: CVE-2026-113877: HTTP::Headers::ActionPack versions before 0.10 for Perl allow CPU exhaustion via Accept-Language ranges matched as regular expressionsBluesky: CVE posts, 23 Oct 2026
- CVE-2026-113877: HTTP::Headers::ActionPack versions before 0.10 for Perl allow CPU exhaustion via Accept-Language ranges matched as regular expressionsoss-security, 23 Oct 2026
Description
HTTP::Headers::ActionPack versions before 0.10 for Perl allow CPU exhaustion via Accept-Language ranges matched as regular expressions.
_language_match interpolates each Accept-Language range into the pattern /^$range\-/i without escaping it, so regular expression syntax in the header reaches the regex engine. A 12-byte range such as (a?|b?){26}z backtracks for seconds, and each increment of the quantifier doubles the time. An invalid range such as ( fails to compile.
A remote attacker can exhaust CPU, or make choose_language die, in any application that passes an untrusted Accept-Language header to it.
Text from CVE List
Affected versions 1
- Productaffected: all versions before 0.10CVE List