What is CVE-2026-55203?

CVE-2026-55203 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. HAProxy - Integer Overflow in FCGI Demux Record Length Field

Which CVE IDs does CVE-2026-55203 cover?

CVE-2026-55203 covers the following CVE IDs: CVE-2026-55203. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-55203?

CVE-2026-55203 has a CVSS v3 base score of 7.5, published by Microsoft Security Response Center (MSRC).

CVE-2026-55203HighCVSS 7.5

HAProxy - Integer Overflow in FCGI Demux Record Length Field

Vendor

Microsoft Security Response Center (MSRC)

Published

June 30, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-55203 →