CVE-2026-26310 — MEDIUM (5.9)

Q: How severe is CVE-2026-26310?

CVE-2026-26310 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-26310?

Check the references section above for vendor advisories and patch information. Affected products include: Envoyproxy Envoy.

Vulnerability Description

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.

CVSS Score

5.9

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Envoyproxy	Envoy	< 1.34.13

Related Weaknesses (CWE)

CWE-20

References

https://github.com/envoyproxy/envoy/security/advisories/GHSA-3cw6-2j68-868pExploitVendor Advisory

FAQ

What is CVE-2026-26310?

CVE-2026-26310 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 ca...

How severe is CVE-2026-26310?

CVE-2026-26310 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-26310?

Check the references section above for vendor advisories and patch information. Affected products include: Envoyproxy Envoy.