CVE-2026-55203 (GCVE-0-2026-55203)
Vulnerability from cvelistv5
Published
2026-06-18 16:05
Modified
2026-07-14 21:33
Severity ?
9.0 (Critical) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:L/SI:H/SA:N
7.5 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N
CWE
  • CWE-190 - Integer Overflow or Wraparound
Summary
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.
References
Impacted products
Vendor Product Version
haproxy haproxy Version: 0   ≤ 3.4.0
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