CVE-2026-116135 HTTP::Body versions before 1.23_01 for Perl drop mixed-case percent escapes from urlencoded form fields instead of decoding them.
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-116135?
CVE-2026-116135 is a vulnerability, published on 28 Oct 2026.
Official description
HTTP::Body versions before 1.23_01 for Perl drop mixed-case percent escapes from urlencoded form fields instead of decoding them.
The decode table holds only the all-lowercase and all-uppercase spelling of each hex pair, while the escape pattern matches either case. An escape such as %aB finds no entry and is replaced with nothing, joining the bytes on either side. Hex digits in percent escapes are case-insensitive, and conforming decoders return the byte.
A remote attacker can send a field name or value that a conforming decoder in front of the application reads differently, so that pass%aBword reaches the application as password.
Weakness: CWE-178
Which versions are affected by CVE-2026-116135?
How do I fix CVE-2026-116135?
No fix has been published for CVE-2026-116135 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-116135 being exploited?
There is no known exploitation of CVE-2026-116135 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-116135, GHSA-xw3w-872r-g8q5.