| Name | CVE-2026-33555 |
| Description | An issue was discovered in HAProxy before 3.3.6. The HTTP/3 parser does not check that the received body length matches a previously announced content-length when the stream is closed via a frame with an empty payload. This can cause desynchronization issues with the backend server and could be used for request smuggling. The earliest affected version is 2.6. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| haproxy (PTS) | bullseye | 2.2.9-2+deb11u6 | vulnerable |
| bullseye (security) | 2.2.9-2+deb11u7 | vulnerable | |
| bookworm, bookworm (security) | 2.6.12-1+deb12u3 | vulnerable | |
| trixie (security), trixie | 3.0.11-1+deb13u2 | vulnerable | |
| forky, sid | 3.2.15-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| haproxy | source | (unstable) | 3.2.15-1 |
Fixed by: https://git.haproxy.org/?p=haproxy-3.2.git;a=commit;h=7ab4ae974c434e62896b3c68b7b485b9dceb7a25 (v3.2.15)
Fixed by: https://git.haproxy.org/?p=haproxy-3.0.git;a=commit;h=425b969d6ea4114f4ae260f57802c65ccafc319c (v3.0.19)
Fixed by: https://git.haproxy.org/?p=haproxy-2.6.git;a=commit;h=3d8388d089170f8544c4a43bf0575f296c885f94 (v2.6.25)