MediumCVE-2026-126367

    @grpc/grpc-js: safe_regex incorrectly applies partial string matching for patterns with alternation (CVE-2026-126367)

    Published Last modified Sources: EUVD, CVE.org, OSV, Hersteller

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    What is affected, what to do

    @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.

    Update Google Grpc-node to version 1.13.2.

    Affected
    • Google Grpc-node gte 1.14.0, < 1.14.2..*
    • Google Grpc-node lt *..1.13.2
    Fixed in
    • Google Grpc-node 1.13.2

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    4.8

    XIEM Effective CVSS

    Highest available CVSS rating from NVD and vendor data.

    Source: Vendor (CNA), CVSS v3

    4.8

    CVSS v3

    Severity Medium on the scale from 0 to 10.

    Source: EUVD, CVE.org, OSV, Hersteller

    —

    EPSS score

    No value is available for this vulnerability.

    Show all metrics
    Severity
    Medium
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    54.00 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    no public PoC known
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    4.8 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    4.8
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published
    CWE

    CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.

    Read in glossary
    CWE-625, CWE-863

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    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.

    Source: ENISA EUVD, NVD (NIST), OSV (Open Source Vulnerabilities), cvelistv5, CVE.org (MITRE), GitHub Security Advisories

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    grpcgrpc-node
    • ≥ 1.14.0, < 1.14.2
    • < 1.13.2
    • —
    • 1.13.2
    npm@grpc/grpc-js-xds
    • >= 1.14.0, < 1.14.2
    • —
    • < 1.13.2
    • 1.14.0
    • 1.14.2
    • 1.13.2
    • 1.13.2
    • 1.14.2

    Vendors and products

    Weakness classes (CWE)

    • CWE-625Permissive Regular Expression

      Base

      The product uses a regular expression that does not sufficiently restrict the set of allowed values.

      Entry at MITRE CWE-625

    • CWE-863Incorrect Authorization

      Class

      The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

      Entry at MITRE CWE-863

    References & sources

    • github.comgrpc/grpc-node/security/advisories/GHSA-r7hq-q2xm-6c5mx_refsource_CONFIRM, euvd, web
    • github.comgrpc/grpc-node/commit/3fc3b0ebf7a89d64843a73679951142d33b40cb1x_refsource_MISC, euvd, web
    • github.comgrpc/grpc-node/commit/57a67e96babcb29b6eabc1833221ccf2fa152d43x_refsource_MISC, euvd, web
    • github.comgrpc/grpc-node/releases/tag/@grpc/grpc-js-xds@1.13.2x_refsource_MISC, euvd, web
    • github.comgrpc/grpc-node/releases/tag/@grpc/grpc-js-xds@1.14.2x_refsource_MISC, euvd, web
    • github.comgrpc/grpc-nodepackage

    Changes to this CVE

    Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

    1. ReceivedGitHub

      CVSS V3.1: AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

      Weakness type: CWE-625, CWE-863

      Description added or changed

      Show 10 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Descriptionadded
      —
      @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.
      CVSSadded
      —
      AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
      Weakness type (CWE)added
      —
      CWE-625
      Weakness type (CWE)added
      —
      CWE-863
      Affected versions (publisher)added
      —
      New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/126xxx/CVE-2026-126367.json">CVE-2026-126367</a>
      Referenceadded
      —
      https://github.com/grpc/grpc-node/commit/3fc3b0ebf7a89d64843a73679951142d33b40cb1
      Referenceadded
      —
      https://github.com/grpc/grpc-node/commit/57a67e96babcb29b6eabc1833221ccf2fa152d43
      Referenceadded
      —
      https://github.com/grpc/grpc-node/releases/tag/@grpc/grpc-js-xds@1.13.2
      Referenceadded
      —
      https://github.com/grpc/grpc-node/releases/tag/@grpc/grpc-js-xds@1.14.2
      Referenceadded
      —
      https://github.com/grpc/grpc-node/security/advisories/GHSA-r7hq-q2xm-6c5m

      Source identifier: security-advisories@github.com

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