gRPC JavaScript Implementation Vulnerability in gRPC-xds by Google
CVE-2026-126367

4.8MEDIUM

Key Information:

Vendor

Grpc

Status
Grpc-node
Vendor
CVE Published:
12 November 2026

What is CVE-2026-126367?

A vulnerability exists in the gRPC JavaScript implementation where the SafeRegexValueMatcher and PathSafeRegexValueMatcher improperly handle regular expressions. Specifically, these matchers add start and end anchors without correctly grouping a provided top-level alternation. As a result, expressions intended to match complete values can inadvertently match prefixes, substrings, or suffixes. This flaw impacts route selection, xDS credential identity matching, and various RBAC rules for URL paths and headers, potentially allowing unauthorized access through misplaced ALLOW or DENY policies. The issue has been addressed in versions 1.13.2 and 1.14.2, which include the necessary fixes.

Affected Version(s)

grpc-node < 1.13.2 < 1.13.2

grpc-node >= 1.14.0, < 1.14.2 < 1.14.0, 1.14.2

References

https://github.com/grpc/grpc-node/security/advisories/GHS...
x_refsource_CONFIRM
https://github.com/grpc/grpc-node/commit/3fc3b0ebf7a89d64...
x_refsource_MISC
https://github.com/grpc/grpc-node/commit/57a67e96babcb29b...
x_refsource_MISC

CVSS V3.1

Score:
4.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.