CVE-2026-33555

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.
NVD Severity
unknown
Other trackers
CVE, NVD, CERT, CVE Details, CIRCL, Arch Linux, Debian, Red Hat, Ubuntu, Gentoo, SUSE (Bugzilla), SUSE (CVE), Mageia
Mailing lists
oss-security, full-disclosure, bugtraq
Exploits
Exploit DB, Metasploit
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
cve@mitre.org https://github.com/haproxy/haproxy/commit/05a295441c621089ffa4318daf0dbca2dd756a84
cve@mitre.org https://www.haproxy.com/documentation/haproxy-aloha/changelog/
cve@mitre.org https://www.haproxy.org
cve@mitre.org https://www.mail-archive.com/haproxy@formilux.org/msg46752.html
cve@mitre.org https://r3verii.github.io/cve/2026/04/14/haproxy-h3-standalone-fin-smuggling.html

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:* haproxy >= 2.6.0 < 3.3.6

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
haproxy edge-main 3.2.19-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.2.18-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.2.17-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.2.16-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.2.15-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.2.14-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.2.13-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.2.12-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.2.11-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.2.10-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.2.9-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.2.8-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.2.7-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.2.6-r1 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.2.6-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.2.5-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.2.4-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.2.3-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.2.2-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.2.1-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.2.0-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.0.10-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.0.9-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.0.8-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.0.7-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy edge-main 3.0.6-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.23-main 3.2.21-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.23-main 3.2.20-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.23-main 3.2.19-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.23-main 3.2.18-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.23-main 3.2.17-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.23-main 3.2.16-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.23-main 3.2.15-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.23-main 3.2.14-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.23-main 3.2.13-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.23-main 3.2.12-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.23-main 3.2.11-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.23-main 3.2.10-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.22-main 3.2.21-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.22-main 3.2.20-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.22-main 3.2.19-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.22-main 3.2.18-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.22-main 3.2.17-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.22-main 3.2.16-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.22-main 3.2.15-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.22-main 3.2.14-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.22-main 3.2.13-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.22-main 3.2.12-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.22-main 3.2.11-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.22-main 3.2.10-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.22-main 3.2.9-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.22-main 3.2.8-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.22-main 3.2.7-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.22-main 3.2.6-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.22-main 3.2.5-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.22-main 3.2.4-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.22-main 3.2.3-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.22-main 3.2.2-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.22-main 3.2.1-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.21-main 3.0.25-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.21-main 3.0.24-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.21-main 3.0.23-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.21-main 3.0.22-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.21-main 3.0.21-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.21-main 3.0.20-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.21-main 3.0.19-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.21-main 3.0.18-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.21-main 3.0.17-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.21-main 3.0.16-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.21-main 3.0.15-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.21-main 3.0.14-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.21-main 3.0.13-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.21-main 3.0.12-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.21-main 3.0.11-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.21-main 3.0.10-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.21-main 3.0.9-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.21-main 3.0.8-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.21-main 3.0.7-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.21-main 3.0.6-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.20-main 2.8.22-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.20-main 2.8.21-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.20-main 2.8.20-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.20-main 2.8.19-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.20-main 2.8.18-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.20-main 2.8.17-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.20-main 2.8.16-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.20-main 2.8.15-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.20-main 2.8.14-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.20-main 2.8.13-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.20-main 2.8.11-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.19-main 2.8.16-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.19-main 2.8.15-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.19-main 2.8.14-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.19-main 2.8.13-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
haproxy 3.19-main 2.8.11-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable