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CVE-2026-84963

CVE-2026-84963 · Silent field truncation via unchecked int cast of huge JSON string values in JSON-to-BSON parser

This page contains facts from public vulnerability sources. Check the original advisory before updating.

An incorrect numeric conversion in the JSON parsing component of the MongoDB C Driver's BSON library may cause an unusually large text value to be silently shortened, or the corresponding field to be omitted, while the parsing operation still reports success and returns no error. An unauthenticated party who can supply the input processed by an application that uses this component may cause that application to hold data that does not match what was submitted, which may result in unintended alteration of data.

CVSS 6.3 · Medium · EPSS 0.3% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • c driver

    Versions
    • ≥ 1.10.0, < 1.30.9: Affected (semver)
    • ≥ 2.0.0, < 2.5.2: Affected (semver)

    Update to 1.30.9; Update to 2.5.2

  • mongo-c-driver Debian:12

    Versions
    • 1.23.1-1
    • 1.23.1-1+deb12u1
    • 1.23.1-1+deb12u2
    • 1.23.1-1+deb12u3
    • 1.24.1-1
    • 1.24.2-1
    • 1.24.3-1
    • 1.24.4-1
    • 1.25.0-1
    • 1.25.1-1
    • 1.25.2-1
    • 1.25.4-1
    • 1.25.4-1.1~exp1
    • 1.26.0-1
    • 1.26.0-1.1
    • 1.26.0-1.1~exp1
    • 1.26.1-1
    • 1.26.2-1
    • 1.27.0-1
    • 1.27.1-1
    • 1.27.2-1
    • 1.27.3-1
    • 1.27.4-1
    • 1.27.5-1
    • 1.27.6-1
    • 1.28.0-1
    • 1.28.1-1
    • 1.29.0-1
    • 1.29.1-1
    • 1.29.2-1
    • 1.30.0-1
    • 1.30.1-1
    • 1.30.2-1
    • 1.30.3-1
    • 1.30.4-1
    • 2.0.2-1
    • 2.1.0-1
    • 2.1.1-1
    • 2.1.2-1
    • 2.2.0-1
    • 2.2.1-1
    • 2.2.2-1
    • 2.2.3-1
    • 2.2.4-1
    • 2.3.0-1
    • 2.3.1-1
    • 2.3.2-1
    • 2.3.3-1
    • 2.4.0-1
    • 2.5.0-1
    • 2.5.1-1
    • 2.5.2-1
    • 2.5.3-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • mongo-c-driver Debian:13

    Versions
    • 1.30.4-1
    • 1.30.4-1+deb13u1
    • 1.30.4-1+deb13u2
    • 1.30.4-1+deb13u3
    • 2.0.2-1
    • 2.1.0-1
    • 2.1.1-1
    • 2.1.2-1
    • 2.2.0-1
    • 2.2.1-1
    • 2.2.2-1
    • 2.2.3-1
    • 2.2.4-1
    • 2.3.0-1
    • 2.3.1-1
    • 2.3.2-1
    • 2.3.3-1
    • 2.4.0-1
    • 2.5.0-1
    • 2.5.1-1
    • 2.5.2-1
    • 2.5.3-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • mongo-c-driver Debian:14

    Versions
    • 1.30.4-1
    • 2.0.2-1
    • 2.1.0-1
    • 2.1.1-1
    • 2.1.2-1
    • 2.2.0-1
    • 2.2.1-1
    • 2.2.2-1
    • 2.2.3-1
    • 2.2.4-1
    • 2.3.0-1
    • 2.3.1-1
    • 2.3.2-1
    • 2.3.3-1
    • 2.4.0-1
    • 2.5.0-1
    • 2.5.1-1
    Affected ranges
    • ECOSYSTEM: < 2.5.2-1

    Update to 2.5.2-1

  • mongo-c-driver Ubuntu:Pro:20.04:LTS

    Versions
    • 1.15.0-1
    • 1.15.1-1
    • 1.15.2-1
    • 1.16.0-1
    • 1.16.1-1
    • 1.16.1-1build1
    • 1.16.1-1build2
    • 1.16.1-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • mongo-c-driver Ubuntu:Pro:22.04:LTS

    Versions
    • 1.18.0-1
    • 1.19.1-1
    • 1.19.2-1
    • 1.20.0-1
    • 1.20.0-1build1
    • 1.20.1-1
    • 1.21.0-1
    • 1.21.0-1build1
    • 1.21.0-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • mongo-c-driver Ubuntu:Pro:24.04:LTS

    Versions
    • 1.24.3-1
    • 1.24.4-1
    • 1.25.1-1
    • 1.25.2-1
    • 1.25.4-1
    • 1.26.0-1
    • 1.26.0-1.1ubuntu1
    • 1.26.0-1.1ubuntu2
    • 1.26.0-1.1ubuntu2+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • mongo-c-driver Ubuntu:26.10

    Versions
    • 2.2.2-1
    • 2.3.1-1
    • 2.3.2-1
    • 2.3.3-1build1
    • 2.5.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • mongo-c-driver Ubuntu:26.04:LTS

    Versions
    • 1.30.4-1ubuntu1
    • 2.2.0-1
    • 2.2.1-1
    • 2.2.2-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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