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CVE-2026-55233

nvd nist
Published: Jul 10, 2026Modified: Jul 14, 2026

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7.5
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploitability: 3.9 / Impact: 3.6
Source: security-advisories@github.com (Secondary)

Description

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 headers to upstream servers, constructing the header in the stream proxy protocol v2 patch can write beyond the bounds of the allocated buffer, causing the worker process to crash and resulting in a denial of service. Only configurations that explicitly enable PROXY protocol v2 for upstream connections are impacted. This issue is fixed in version 1.29.2.5.

Affected (1)

Products: Openresty: Openresty
Openresty
1 product
Openresty
Configuration A
1 vulnerable
Vulnerable SoftwareAffected Versions
Openresty
From 1.29.2.1 to 1.29.2.5

Related CWEs

CWE-787
Out-of-bounds Write
The product writes data past the end, or before the beginning, of the intended buffer.

References (2)

Source: security-advisories@github.com
Patch
Source: security-advisories@github.com
MitigationVendor Advisory

Timeline

No history available yet.