AIKIDO-2026-593205
openresty is vulnerable to Out-of-bounds Write
75
High Risk
This Affects:
openrestyTL;DR
OpenResty's stream module includes an upstream PROXY protocol v2 patch that builds a binary protocol header before forwarding a connection to an upstream server. When a deployment is configured to emit PROXY protocol v2 to upstreams, the header serialization advances a write pointer through address-family and Type-Length-Value fields without fully validating the remaining space in the preallocated buffer. This lets the routine write past the buffer boundary, which results in a denial of service. The fix adds bounds enforcement so header bytes are only written when sufficient buffer space remains.
Who does this affect?
You are affected if you are running a version in the vulnerable range and your configuration explicitly enables PROXY protocol v2 for upstream connections.
Background info
openresty is vulnerable to Out-of-bounds Write in versions 1.29.2.1 - 1.29.2.4.
How to fix this
Upgrade the openresty/openresty library to the patch version.
Links
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SOC 2Compliant
ISO 27001Compliant