PT-2026-55077 · Bitnami · Haproxy

Published 2026-06-30 · Updated 2026-06-30

OSV

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.

Related Identifiers

BIT-HAPROXY-2026-33555

Affected Products

Haproxy

References · 7

• https://osv.dev/vulnerability/BIT-haproxy-2026-33555 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33555 · Security Note
• https://github.com/haproxy/haproxy/commit/05a295441c621089ffa4318daf0dbca2dd756a84 · Note
• https://haproxy.com/documentation/haproxy-aloha/changelog · Note
• https://haproxy.org · Note
• https://r3verii.github.io/cve/2026/04/14/haproxy-h3-standalone-fin-smuggling.html · Note
• https://mail-archive.com/[e-mail]/msg46752.html · Note