Crash for scoped ip address in Envoy during DNS
Priority LOW 33CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.
Summary
Envoy is a high-performance edge/middle/service proxy. Prior to 1.37.1, 1.36.5, 1.35.8, and 1.34.13, calling Utility::getAddressWithPort with a scoped IPv6 addresses causes a crash. This utility is called in the data plane from the original_src filter and the dns filter. This vulnerability is fixed in 1.37.1, 1.36.5, 1.35.8, and 1.34.13.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00437 38th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed envoy (envoyproxy): 1.37.1, 1.36.5, 1.35.9 +1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| envoyproxy | envoy | 1.37.0 to before 1.37.1; 1.36.0 to before 1.36.5; 1.35.0 to before 1.35.9; before 1.34.13 | 1.37.1, 1.36.5, 1.35.9, 1.34.13 | Patch available | CNA |
| — | github.com/envoyproxy/envoy (Go) | — | — | No fix listed | GHSA-3cw6-2j68-868p |
| — | github.com/envoyproxy/envoy (Go) | 1.36.0 – 1.36.4 | — | No fix listed | GHSA-3cw6-2j68-868p |
| — | github.com/envoyproxy/envoy (Go) | 1.35.0 – 1.35.8 | — | No fix listed | GHSA-3cw6-2j68-868p |
| — | github.com/envoyproxy/envoy (Go) | up to 1.34.12 | — | No fix listed | GHSA-3cw6-2j68-868p |
- envoy Vendorenvoyproxy Affected 1.37.0 to before 1.37.1; 1.36.0 to before 1.36.5; 1.35.0 to before 1.35.9; before 1.34.13 Fixed in 1.37.1, 1.36.5, 1.35.9, 1.34.13 Patch available CNA
- github.com/envoyproxy/envoy (Go) Vendor— Affected — Fixed in — No fix listed GHSA-3cw6-2j68-868p
- github.com/envoyproxy/envoy (Go) Vendor— Affected 1.36.0 – 1.36.4 Fixed in — No fix listed GHSA-3cw6-2j68-868p
- github.com/envoyproxy/envoy (Go) Vendor— Affected 1.35.0 – 1.35.8 Fixed in — No fix listed GHSA-3cw6-2j68-868p
- github.com/envoyproxy/envoy (Go) Vendor— Affected up to 1.34.12 Fixed in — No fix listed GHSA-3cw6-2j68-868p
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* | before 1.34.13; 1.35.0 to before 1.35.8; 1.36.0 to before 1.36.5 | Vulnerable | envoyproxy |
| cpe:2.3:a:envoyproxy:envoy:1.37.0:*:*:*:*:*:*:* | 1.37.0 | Vulnerable | envoyproxy |
- cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* Versions before 1.34.13; 1.35.0 to before 1.35.8; 1.36.0 to before 1.36.5 Vulnerable ·envoyproxy
- cpe:2.3:a:envoyproxy:envoy:1.37.0:*:*:*:*:*:*:* Versions 1.37.0 Vulnerable ·envoyproxy
Remediation
- Fix · CNA envoy (envoyproxy) Fixed in 1.37.1, 1.36.5, 1.35.9, 1.34.13
Timeline
- 2026-10-02 Threatist record created from CVE-2026-26310
- 2026-10-03 Alias added: GHSA-3cw6-2j68-868p
References
More envoyproxy Envoy vulnerabilities
- TI-2026-79288 Out-of-bounds write in Google Brotli decoder KEVCVSS 4.0CRITICAL 9.2
- TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
- TI-2024-20001 HTTP/2: CPU exhaustion due to CONTINUATION frame flood CVSS 3.1HIGH 7.5
- TI-2024-18524 HTTP/2: memory exhaustion due to CONTINUATION frame flood CVSS 3.1HIGH 7.5
- TI-2023-12215 Envoy client may fake the header `x-envoy-original-path` CVSS 3.1CRITICAL 9.1
- TI-2023-18002 Envoy vulnerable to OAuth2 credentials exploit with permanent validity CVSS 3.1CRITICAL 9.8
Sources
- CVE-2026-26310 · CVE Program
- CVE-2026-26310 · NVD
- FIRST EPSS
- GHSA-3cw6-2j68-868p · GitHub Advisory Database · CC BY 4.0
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