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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 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 PRO
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:5acaf471b2b1b4b744ef7ce13401351e0c949056e3992db8577bbba7f64e2a57
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"openresty","vendor":"openresty","versions":[{"status":"affected","version":">= 1.29.2.1, < 1.29.2.5"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:dca43d6c617978cc9a66ac9cf788aa8de58f76a31ea2188d12f3ef4412429b0d · sha256:cba086b5e8b3dbaa… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:dca43d6c617978cc9a66ac9cf788aa8de58f76a31ea2188d12f3ef4412429b0d · sha256:cba086b5e8b3dbaa… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-787","description":"CWE-787: Out-of-bounds Write","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:dca43d6c617978cc9a66ac9cf788aa8de58f76a31ea2188d12f3ef4412429b0d · sha256:cba086b5e8b3dbaa… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/openresty/openresty/commit/5c56ad2958a2dad8b2cc99f4987b8642cbc647d1","tags":["x_refsource_MISC"],"url":"https://github.com/openresty/openresty/commit/5c56ad2958a2dad8b2cc99f4987b8642cbc647d1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:dca43d6c617978cc9a66ac9cf788aa8de58f76a31ea2188d12f3ef4412429b0d · sha256:cba086b5e8b3dbaa… · /containers/cna/references/1
{"name":"https://github.com/openresty/openresty/security/advisories/GHSA-wx83-v28q-68gx","tags":["x_refsource_CONFIRM"],"url":"https://github.com/openresty/openresty/security/advisories/GHSA-wx83-v28q-68gx"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:dca43d6c617978cc9a66ac9cf788aa8de58f76a31ea2188d12f3ef4412429b0d · sha256:cba086b5e8b3dbaa… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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