CVE-2026-115822 Starman versions before 0.4019 for Perl allow CPU exhaustion via quadratic regex backtracking when parsing chunked request bodies.
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-115822?
CVE-2026-115822 is a vulnerability, published on 25 Oct 2026.
Official description
Starman versions before 0.4019 for Perl allow CPU exhaustion via quadratic regex backtracking when parsing chunked request bodies.
Starman decodes chunked request bodies before calling the application, matching each chunk-size line with `s/^(([0-9a-fA-F]+).*\015\012)//`. A line of hex digits followed by a bare LF and then CRLF never matches, because `.` does not match LF, and each failed attempt backtracks in time quadratic in the length of the hex run. Nothing limits the length of the line.
A remote attacker can exhaust worker CPU by sending such requests to any route.
Weakness: CWE-1333
Which versions are affected by CVE-2026-115822?
How do I fix CVE-2026-115822?
Upgrade to a fixed version.
Is CVE-2026-115822 being exploited?
There is no known exploitation of CVE-2026-115822 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-115822, GHSA-2826-qw6w-9h42, UBUNTU-CVE-2026-115822.