CVE-2026-55203

Name
CVE-2026-55203
Description
HAProxy through 3.4.0, fixed in commit 5985276, contains an integer overflow vulnerability in the fcgi_conn structure's drl field that allows buffer misparse as new FCGI record headers. When contentLength is 65535 and paddingLength is 1 or more, the drl field wraps to 0, causing incorrect record consumption and allowing malicious FastCGI backends to desynchronize the FCGI framing parser, potentially causing request routing errors, response smuggling, or memory safety issues.
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
disclosure@vulncheck.com https://github.com/haproxy/haproxy/commit/5985276735777634d8c85f1d73bb7764aab0d6dd
disclosure@vulncheck.com https://www.vulncheck.com/advisories/haproxy-integer-overflow-in-fcgi-demux-record-length-field

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:* haproxy >= None <= 3.4.0

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
haproxy edge-main 3.4.0-r0 Milan P. Stanić <mps@arvanta.net> possibly vulnerable
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 edge-main 2.1.4-r0 None possibly vulnerable
haproxy 3.24-main 3.4.0-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 3.22-main 2.1.4-r0 None 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 3.21-main 2.1.4-r0 None 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 3.20-main 2.1.4-r0 None 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
haproxy 3.19-main 2.1.4-r0 None possibly vulnerable