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CVE-2026-84971

CVE-2026-84971 · Persistent client crash loop via undersized FLE2 insert-update ciphertext in decryption path

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

Improper handling of an unexpected value size in the decryption path of a client-side encryption library can cause a failed internal check that terminates the process using the library. A party able to place a suitably formed encrypted value where an application will decrypt it, or able to control the responses the application receives, may cause that application to stop running.

CVSS 7.1 · High · EPSS 0.3% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • libmongocrypt

    Versions
    • ≥ 1.7.0, < 1.20.4: Affected (semver)

    Update to 1.20.4

  • libmongocrypt Debian:12

    Versions
    • 1.10.0-1
    • 1.10.1-1
    • 1.11.0-1
    • 1.12.0-1
    • 1.13.0-1
    • 1.13.1-1
    • 1.13.2-1
    • 1.16.0-1
    • 1.17.0-1
    • 1.17.3-1
    • 1.18.1-1
    • 1.18.2-1
    • 1.19.0-1
    • 1.19.1-1
    • 1.20.0-1
    • 1.20.1-1
    • 1.20.2-1
    • 1.20.3-1
    • 1.20.4-1
    • 1.7.2-1
    • 1.8.2-1
    • 1.8.4-1
    • 1.9.1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libmongocrypt Debian:13

    Versions
    • 1.13.2-1
    • 1.13.2-1+deb13u1
    • 1.16.0-1
    • 1.17.0-1
    • 1.17.3-1
    • 1.18.1-1
    • 1.18.2-1
    • 1.19.0-1
    • 1.19.1-1
    • 1.20.0-1
    • 1.20.1-1
    • 1.20.2-1
    • 1.20.3-1
    • 1.20.4-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libmongocrypt Debian:14

    Versions
    • 1.13.2-1
    • 1.16.0-1
    • 1.17.0-1
    • 1.17.3-1
    • 1.18.1-1
    • 1.18.2-1
    • 1.19.0-1
    • 1.19.1-1
    • 1.20.0-1
    • 1.20.1-1
    • 1.20.2-1
    • 1.20.3-1
    Affected ranges
    • ECOSYSTEM: < 1.20.4-1

    Update to 1.20.4-1

  • libmongocrypt Ubuntu:22.04:LTS

    Versions
    • 1.2.1-1
    • 1.2.2-1
    • 1.3.0-1
    • 1.3.0-1ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libmongocrypt Ubuntu:24.04:LTS

    Versions
    • 1.7.2-1
    • 1.8.2-1
    • 1.8.4-1
    • 1.8.4-1build2
    • 1.8.4-1build3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libmongocrypt Ubuntu:26.10

    Versions
    • 1.17.0-1
    • 1.19.0-1
    • 1.19.1-1
    • 1.20.0-1
    • 1.20.1-1build1
    • 1.20.2-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libmongocrypt Ubuntu:26.04:LTS

    Versions
    • 1.13.2-1
    • 1.17.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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