Envoy: PROXY Protocol v2 header generator emits "skipped" TLVs, causing 65 KB attacker-controlled spillover into the upstream application stream

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Summary

CVECVE-2026-47692
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-26 18:16:59 UTC
Updated2026-06-26 20:17:15 UTC
DescriptionEnvoy is an open source edge and service proxy designed for cloud-native applications. From 1.34.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, PROXY Protocol v2 header generator emits TLVs beyond the maximum length of 65535 bytes, causing a mismatch between bytes written and the length field in the header. This can result in smuggled bytes on the upstream request. This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3.

Risk And Classification

Primary CVSS: v3.1 4.8 MEDIUM from [email protected]

CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:L

Problem Types: CWE-130 | CWE-130 CWE-130: Improper Handling of Length Parameter Inconsistency

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.8MEDIUMCVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:L
3.1CNADECLARED4.8MEDIUMCVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
Low

CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Envoyproxy Envoy affected >= 1.38.0, < 1.38.3 Not specified
CNA Envoyproxy Envoy affected >= 1.37.0, < 1.37.5 Not specified
CNA Envoyproxy Envoy affected >= 1.36.0, < 1.36.9 Not specified
CNA Envoyproxy Envoy affected >= 1.34.0, < 1.35.13 Not specified

References

ReferenceSourceLinkTags
github.com/envoyproxy/envoy/security/advisories/GHSA-wh36-hm39-mm3r [email protected] github.com
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