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CVE-2026-47692

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

Medium4.8EPSS 0.22%
Published
Updated
Reserved
Assigned by
GitHub_M

Description

Envoy 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.

Scores

CVSS scores of CVE-2026-47692, by who scored it
Scored byCVSSScoreVector
GitHub_MCNA (assigner)3.1Medium4.8CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:L
NVDNVD · Analyzed3.1Medium4.3CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS (exploitation in 30 days)
0.22% · top 88% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.8.

Weakness

Affected products

  • envoyproxy · envoy

    • affected >= 1.38.0, < 1.38.3
    • affected >= 1.37.0, < 1.37.5
    • affected >= 1.36.0, < 1.36.9
    • affected >= 1.34.0, < 1.35.13

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .