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.
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Affected Vendors & Products
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History
Mon, 13 Jul 2026 19:30:00 +0000
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Fri, 10 Jul 2026 22:45:00 +0000
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Openresty
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Fri, 10 Jul 2026 20:45:00 +0000
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| 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. | |
| Title | OpenResty: Buffer overflow when writing PROXY protocol v2 header to upstream | |
| Weaknesses | CWE-787 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-07-10T19:59:59.530Z
Updated: 2026-07-13T18:10:43.893Z
Reserved: 2026-06-16T16:44:00.623Z
Link: CVE-2026-55233
Updated: 2026-07-13T18:10:38.903Z
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