CVE-2026-113877 HTTP::Headers::ActionPack versions before 0.10 for Perl allow CPU exhaustion via Accept-Language ranges matched as regular expressions.
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-113877?
CVE-2026-113877 is a vulnerability, published on 23 Oct 2026.
Official 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.
Weakness: CWE-624
Which versions are affected by CVE-2026-113877?
How do I fix CVE-2026-113877?
Upgrade to a fixed version.
Is CVE-2026-113877 being exploited?
There is no known exploitation of CVE-2026-113877 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-113877, GHSA-q4hv-hfj9-x4r5.