@grpc/grpc-js: safe_regex incorrectly applies partial string matching for patterns with alternation

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-126367
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-13 00:20:12 UTC
Updated2026-11-13 00:20:12 UTC
Description@grpc/grpc-js implements the core functionality of gRPC purely in JavaScript, without a C++ addon. Before 1.13.2, and from 1.14.0 through 1.14.1, the @grpc/grpc-js-xds SafeRegexValueMatcher and PathSafeRegexValueMatcher add start and end anchors without grouping a supplied top-level alternation. An expression intended to match one of several complete values can therefore match a prefix, substring, or suffix. The affected matchers are used for route selection, xDS credential identity matching, and RBAC URL path, principal name, server name, and header rules. An ALLOW policy using an alternation can consequently accept a method, certificate identity, or header value outside the intended set, while a DENY policy becomes broader rather than permissive. This issue is fixed in versions 1.13.2 and 1.14.2.

Risk And Classification

Primary CVSS: v3.1 4.8 MEDIUM from [email protected]

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

Problem Types: CWE-625 | CWE-863 | CWE-625 CWE-625: Permissive Regular Expression | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
3.1CNADECLARED4.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Grpc Grpc-node affected < 1.13.2 Not specified
CNA Grpc Grpc-node affected >= 1.14.0, < 1.14.2 Not specified

References

ReferenceSourceLinkTags
github.com/grpc/grpc-node/commit/3fc3b0ebf7a89d64843a73679951142d33b40cb1 [email protected] github.com
github.com/grpc/grpc-node/releases/tag/@grpc/[email protected] [email protected] github.com
github.com/grpc/grpc-node/releases/tag/@grpc/[email protected] [email protected] github.com
github.com/grpc/grpc-node/commit/57a67e96babcb29b6eabc1833221ccf2fa152d43 [email protected] github.com
github.com/grpc/grpc-node/security/advisories/GHSA-r7hq-q2xm-6c5m [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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