Buffer overflow in Openresty
CVE-2026-55233
OpenResty is a high performance web platform. From 1.29.2.1 to before 1.29.2.5, an out-of-bounds write vulnerability exists in the upstream PROXY protocol v2 implementation. When OpenResty is configured to send PROXY protocol version 2 hea…
Vulnerability class: Buffer Overflow
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Openresty — versions >= 1.29.2.1, < 1.29.2.5
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-55233?
- CVE-2026-55233 is a high-severity vulnerability in Openresty, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2026-07-10.
- How severe is CVE-2026-55233?
- High severity. CVSS v3 base score is 7.5 out of 10.