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
CriticalCVSS 9.8
EPSS 0.60%
- Published
- Updated
- Exploit status
- No public exploit known
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.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| cpan HTTP-Body | < 1.23_01 | 1.23_01 |
| debian/libhttp-body-perl(Debian:12) | All versions | No fix listed |
| debian/libhttp-body-perl(Debian:12) | = 1.22-2 | No fix listed |
| debian/libhttp-body-perl(Debian:12) | = 1.23-1 | No fix listed |
| debian/libhttp-body-perl(Debian:12) | = 1.24.01-1 | No fix listed |
| debian/libhttp-body-perl(Debian:13) | All versions | No fix listed |
| debian/libhttp-body-perl(Debian:13) | = 1.23-1 | No fix listed |
| debian/libhttp-body-perl(Debian:13) | = 1.24.01-1 | No fix listed |
| debian/libhttp-body-perl(Debian:14) | < 1.24.01-1 | 1.24.01-1 |
| debian/libhttp-body-perl(Debian:14) | = 1.23-1 | No fix listed |
| ubuntu/libhttp-body-perl(Ubuntu:22.04) | All versions | No fix listed |
| ubuntu/libhttp-body-perl(Ubuntu:24.04) | All versions | No fix listed |
| ubuntu/libhttp-body-perl(Ubuntu:26.04) | All versions | No fix listed |
| ubuntu/libhttp-body-perl(Ubuntu:26.10) | All versions | No fix listed |
References
- Red Hat CVE page mitigation vendor-advisory
- Red Hat Bugzilla 2563041 issue-tracking
- www.cve.org
- nvd.nist.gov
- github.com patch
- metacpan.org release-notes
- www.rfc-editor.org
- Debian Security Tracker CVE-2026-116135 vendor-advisory
- Ubuntu CVE tracker vendor-advisory
- bugs.debian.org issue-tracking