HTTP::Headers::ActionPack versions before 0.10 for Perl allow CPU exhaustion via Accept-Language ranges matched as regular expressions

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-113877
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-23 21:17:21 UTC
Updated2026-10-23 23:17:42 UTC
DescriptionHTTP::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.

Risk And Classification

Problem Types: CWE-624 | CWE-624 CWE-624 Executable Regular Expression Error

References

ReferenceSourceLinkTags
github.com/robrwo/perl-HTTP-Headers-ActionPack/commit/77f0deb23f3de872c2... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
metacpan.org/release/RRWO/HTTP-Headers-ActionPack-0.10/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
www.openwall.com/lists/oss-security/2026/10/23/27 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Upgrade to HTTP-Headers-ActionPack 0.10 or later.

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