Unrated severityNVD Advisory· Published Apr 4, 2023· Updated Feb 11, 2025
Envoy forwards invalid Http2/Http3 downstream headers
CVE-2023-27491
Description
Envoy is an open source edge and service proxy designed for cloud-native applications. Compliant HTTP/1 service should reject malformed request lines. Prior to versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9, There is a possibility that non compliant HTTP/1 service may allow malformed requests, potentially leading to a bypass of security policies. This issue is fixed in versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
3<1.26.0, <1.25.3, <1.24.4, <1.23.6, <1.22.9+ 1 more
- (no CPE)range: <1.26.0, <1.25.3, <1.24.4, <1.23.6, <1.22.9
- (no CPE)range: >= 1.25.0, < 1.25.3
Patches
Vulnerability mechanics
References
4- datatracker.ietf.org/doc/html/rfc9113mitrex_refsource_MISC
- datatracker.ietf.org/doc/html/rfc9114mitrex_refsource_MISC
- github.com/envoyproxy/envoy/security/advisories/GHSA-5jmv-cw9p-f9rpmitrex_refsource_CONFIRM
- www.rfc-editor.org/rfc/rfc9110mitrex_refsource_MISC
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