CVE catalog
CVE-2026-48743
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
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.30% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Cpe | envoy | Not reported | 1.35.13 | fixed |
| Cpe | envoy | Not reported | 1.36.9 | fixed |
| Cpe | envoy | Not reported | 1.37.5 | fixed |
| Cpe | envoy | Not reported | 1.38.3 | fixed |
| Cpe | envoy | Not reported | 1.38.3 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Cpe | envoy | cpe | Not reported | 1.35.13 | Not reported | Not reported | Not reported |
| Cpe | envoy | cpe | Not reported | 1.36.9 | Not reported | Not reported | Not reported |
| Cpe | envoy | cpe | Not reported | 1.37.5 | Not reported | Not reported | Not reported |
| Cpe | envoy | cpe | Not reported | 1.38.3 | Not reported | Not reported | Not reported |
| Cpe | envoy | cpe | Not reported | 1.38.3 | Not reported | NVD-CVE-2026-48743 | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11141-1.json]
- [https://github.com/envoyproxy/envoy/security/advisories/GHSA-8phg-2h2q-jgxf]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-48743]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48743.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2048.json]
[CERT-Bund public advisories] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]