CVE-2026-47207 json
Envoy crashes if multiple unexpected ext_proc responses are packed into one gRPC message
published 2026-06-26 4 mo ago modified 2026-10-25 14 d ago also BIT-envoy-2026-47207 , EUVD-2026-39826 , GHSA-68cv-hq5f-g6xv
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 38%
- public exploits
- 0
- none known
Summary
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, Envoy crashes if an ext_proc server sends a single gRPC message containing multiple, specially crafted ProcessingResponse messages. This can occur when the first response in the batch causes the gRPC stream object to be destroyed, leading to a use-after-free error when Envoy attempts to process subsequent responses in the same gRPC message. This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3.
Patch / fix
- bitnami envoy 1.35.13, 1.36.9, 1.37.5, 1.38.3
- envoyproxy envoy 1.35.13, 1.36.9, 1.37.5, 1.38.3
- istioctl openSUSE Tumbleweed 1.30.2-1.1
opensuse advisories openSUSE-SU-2026:11141-1
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 4 mo ago
Exploit prediction
0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/envoyproxy/envoy/security/advisories/GHSA-68cv-hq5f-g6xv referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| OSV | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | envoy | >=1.34.0, <1.35.13 >=1.36.0, <1.36.9 >=1.37.0, <1.37.5 >=1.38.0, <1.38.3 |
1.35.13 1.36.9 1.37.5 1.38.3 |
Affected products
- envoyproxy envoy
Classification
- Weakness
-
- CWE-416 Use After Free
References
-
github.com
/envoyproxy/envoy/security/advisories/GHSA-68cv-hq5f-g6xv
exploit, vendor-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-47207
web
Sources
- CVE List CVE-2026-47207
- NVD CVE-2026-47207
- OSV BIT-envoy-2026-47207
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.