CVE-2026-48743

highpriority · track · 0EPSS 0.003 · 22 %ileDEEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.30% (22nd) EPSS

CVSS 7.5 · high

Is it mine?

22 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · osv · cert_bund

EPSS · scored 2026-10-27

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.35.11, 1.36.7, 1.37.3, and 1.38.1, Envoy can translate a downstream HTTP/3 request that is complete at the transport layer (HEADERS with FIN / headers-only close) but still carries a nonzero Content-Length into a complete upstream HTTP/1 request with unresolved body debt. In an HTTP/1 upstream deployment where the origin replies before reading the declared body and keeps the connection reusable, the beginning of the next Envoy-generated upstream request can be consumed as the first request's body. The remaining bytes are then parsed by the origin as a new HTTP/1 request. This was reproduced as a route-bypass/desync: direct /pwn was denied by Envoy, but the second downstream H3 stream received the response for backend-parsed GET /pwn HTTP/1.1. This vulnerability is fixed in 1.35.11, 1.36.7, 1.37.3, and 1.38.1.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5

v3.17.5highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:Nsecondary · ENISA EU

v3.17.5highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:Nsecondary · security-advisories@github.comexploitability 2.2 · impact 4.7

v3.16.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: no · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-444US

affected products (22)

Products and version ranges known to be affected.

Google Cloud Platform Envoy Proxyall versionscert_bundDEcpe:/a:google:cloud_platform:envoy_proxy
Google Cloud Platform in-cluster Cloud Service Mesh <1.27.9-asm.8all versionscert_bundDE
Google Cloud Platform in-cluster Cloud Service Mesh <1.28.9-asm.2all versionscert_bundDE
Google Cloud Platform in-cluster Cloud Service Mesh <1.29.5-asm.3all versionscert_bundDE
Google Cloud Platform managed Cloud Service Meshall versionscert_bundDEcpe:/a:google:cloud_platform:managed_cloud_service_mesh
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
SUSE openSUSEall versionscert_bundDEcpe:/o:suse:opensuse:-
Google Cloud Platform≤ in-cluster Cloud Service Mesh <1.27.9-asm.8cert_bundDE
Google Cloud Platform≤ in-cluster Cloud Service Mesh <1.28.9-asm.2cert_bundDE
Google Cloud Platform≤ in-cluster Cloud Service Mesh <1.29.5-asm.3cert_bundDE
envoyproxy envoy1.35.0, → 1.35.11enisa_euvdEU
envoyproxy envoy1.36.0, → 1.36.7enisa_euvdEU
envoyproxy envoy1.37.0, → 1.37.3enisa_euvdEU
envoyproxy envoy1.38.0, → 1.38.1enisa_euvdEU
envoyproxy envoy1.35.0 → 1.35.13nvdUScpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*
envoyproxy envoy1.36.0 → 1.36.9nvdUScpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*
envoyproxy envoy1.37.0 → 1.37.5nvdUScpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*
envoyproxy envoy1.38.0 → 1.38.3nvdUScpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*
Bitnami envoy1.35.0 → 1.35.11osvUSpkg:bitnami/envoy
Bitnami envoy1.36.0 → 1.36.7osvUSpkg:bitnami/envoy

showing 20 of 22

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-2048Google Cloud Service Mesh und Envoy Proxy: Mehrere SchwachstellenDeutsch2026-06-23csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Google Cloud Service Mesh und Envoy Proxy ausnutzen, um einen Denial-of-Service-Zustand zu verursachen, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen oder andere, nicht näher bezeichnete Angriffe durchzuführen.
BIT-envoy-2026-48743Envoy: HTTP/3 to HTTP/1 request smuggling via headers-only request with nonzero Content-Length2026-06-30vendor · osvUS
Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.35.11, 1.36.7, 1.37.3, and 1.38.1, Envoy can translate a downstream HTTP/3 request that is complete at the transport layer (HEADERS with FIN / headers-only close) but still carries a nonzero Content-Length into a complete upstream HTTP/1 request with unresolved body debt. In an HTTP/1 upstream deployment where the origin replies before reading the declared body and keeps the connection reusable, the beginning of the next Envoy-generated upstream request can be consumed as the first request's body. The remaining bytes are then parsed by the origin as a new HTTP/1 request. This was reproduced as a route-bypass/desync: direct /pwn was denied by Envoy, but the second downstream H3 stream received the response for backend-parsed GET /pwn HTTP/1.1. This vulnerability is fixed in 1.35.11, 1.36.7, 1.37.3, and 1.38.1.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv cert_bund nvd NVD CVE.org MITRE

published 2026-06-26modified 2026-10-25

references (3)

External citations — patches, advisories, analysis.

scry

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