Out-of-bounds Write Affecting openresty/openresty package, versions [1.27.1.1,1.29.2.5)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published11 Jul 2026
- disclosed10 Jul 2026
- creditUnknown
Introduced: 10 Jul 2026
CVE-2026-55233 (opens in a new tab)How to fix?
Upgrade openresty/openresty to version 1.29.2.5 or higher.
Overview
Affected versions of this package are vulnerable to Out-of-bounds Write in the process of constructing the PROXY protocol v2 header for upstream connections. An attacker can cause the worker process to crash and disrupt service availability by sending specially crafted requests when PROXY protocol v2 is enabled for upstream servers. This is only exploitable if the configuration explicitly enables PROXY protocol v2 for upstream connections.