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CVE-2026-96749

CVE-2026-96749 · Heap out-of-bounds write via signed size overflow in BSON document encoding

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

An integer overflow in the BSON document encoding component of the MongoDB Python Driver's bundled native extension may occur when a single document is built from an unusually large amount of caller-supplied data. Size arithmetic is performed in a signed 32-bit type, and the guard meant to catch the overflow is written in a form whose behavior is not defined by the C language standard. A party with no privileges who can place a very large value into data that an application encodes may, depending on how the native extension was built, cause a write outside the bounds of an allocated buffer inside the application's own process.

CVSS 7.5 · High · EPSS 0.1% · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • python driver

    Versions
    • ≥ 1.9.0, < 4.18.2: Affected (semver)

    Update to 4.18.2

  • pymongo Debian:12

    Versions
    • 3.11.0-1
    • 3.11.0-1+deb12u1
    • 4.10.1-1
    • 4.10.1-2
    • 4.10.1-3
    • 4.10.1-4
    • 4.10.1-5
    • 4.10.1-6
    • 4.15.3-1
    • 4.15.3-2
    • 4.15.4-1
    • 4.15.4-2
    • 4.15.5-1
    • 4.16.0-1
    • 4.17.0-1
    • 4.18.1-1
    • 4.18.2-1
    • 4.7.3-1
    • 4.7.3-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pymongo Debian:13

    Versions
    • 4.10.1-6
    • 4.15.3-1
    • 4.15.3-2
    • 4.15.4-1
    • 4.15.4-2
    • 4.15.5-1
    • 4.16.0-1
    • 4.17.0-1
    • 4.18.1-1
    • 4.18.2-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pymongo Debian:14

    Versions
    • 4.10.1-6
    • 4.15.3-1
    • 4.15.3-2
    • 4.15.4-1
    • 4.15.4-2
    • 4.15.5-1
    • 4.16.0-1
    • 4.17.0-1
    • 4.18.1-1
    Affected ranges
    • ECOSYSTEM: < 4.18.2-1

    Update to 4.18.2-1

  • pymongo PyPI

    Versions
    • 0.1.1pre
    • 0.1.2pre
    • 0.10
    • 0.10.1
    • 0.10.2
    • 0.10.3
    • 0.11
    • 0.11.1
    • 0.11.2
    • 0.11.3
    • 0.12
    • 0.13
    • 0.14
    • 0.14.1
    • 0.14.2
    • 0.15
    • 0.15.1
    • 0.15.2
    • 0.16
    • 0.1pre
    • 0.2pre
    • 0.3.1pre
    • 0.3pre
    • 0.4pre
    • 0.5.1pre
    • 0.5.2pre
    • 0.5.3pre
    • 0.5pre
    • 0.6
    • 0.7
    • 0.7.1
    • 0.7.2
    • 0.8
    • 0.8.1
    • 0.9
    • 0.9.1
    • 0.9.2
    • 0.9.3
    • 0.9.4
    • 0.9.5
    • 0.9.6
    • 0.9.7
    • 1.0
    • 1.1
    • 1.1.1
    • 1.1.2
    • 1.10
    • 1.10.1
    • 1.11
    • 1.2
    • 1.2.1
    • 1.3
    • 1.4
    • 1.5
    • 1.5.1
    • 1.5.2
    • 1.6
    • 1.7
    • 1.8
    • 1.8.1
    • 1.9
    • 2.0
    • 2.0.1
    • 2.1
    • 2.1.1
    • 2.2
    • 2.2.1
    • 2.3
    • 2.4
    • 2.4.1
    • 2.4.2
    • 2.5
    • 2.5.1
    • 2.5.2
    • 2.6
    • 2.6.1
    • 2.6.2
    • 2.6.3
    • 2.7
    • 2.7.1
    • 2.7.2
    • 2.8
    • 2.8.1
    • 2.9
    • 2.9.1
    • 2.9.2
    • 2.9.3
    • 2.9.4
    • 2.9.5
    • 3.0
    • 3.0.1
    • 3.0.2
    • 3.0.3
    • 3.1
    • 3.1.1
    • 3.10.0
    • 3.10.1
    • 3.11.0
    • 3.11.1
    • 3.11.2
    • 3.11.3
    • 3.11.4
    • 3.12.0
    • 3.12.1
    • 3.12.2
    • 3.12.3
    • 3.13.0
    • 3.2
    • 3.2.1
    • 3.2.2
    • 3.3.0
    • 3.3.1
    • 3.4.0
    • 3.5.0
    • 3.5.1
    • 3.6.0
    • 3.6.1
    • 3.7.0
    • 3.7.1
    • 3.7.2
    • 3.8.0
    • 3.9.0
    • 4.0
    • 4.0.1
    • 4.0.2
    • 4.1.0
    • 4.1.1
    • 4.10.0
    • 4.10.1
    • 4.11
    • 4.11.1
    • 4.11.2
    • 4.11.3
    • 4.12.0
    • 4.12.1
    • 4.13.0
    • 4.13.0.dev0
    • 4.13.1
    • 4.13.2
    • 4.14.0
    • 4.14.1
    • 4.15.0
    • 4.15.1
    • 4.15.2
    • 4.15.3
    • 4.15.4
    • 4.15.5
    • 4.16.0
    • 4.16.0.dev0
    • 4.17.0
    • 4.18.0
    • 4.18.1
    • 4.2.0
    • 4.3.2
    • 4.3.3
    • 4.4.0
    • 4.4.0b0
    • 4.4.1
    • 4.5.0
    • 4.6.0
    • 4.6.1
    • 4.6.2
    • 4.6.3
    • 4.7.0
    • 4.7.1
    • 4.7.2
    • 4.7.3
    • 4.8.0
    • 4.8.0b0
    • 4.9
    • 4.9.1
    • 4.9.2
    Affected ranges
    • ECOSYSTEM: < 4.18.2

    Update to 4.18.2

  • pymongo Ubuntu:14.04:LTS

    Versions
    • 2.6-1
    • 2.6.2-1
    • 2.6.3-1
    • 2.6.3-1build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pymongo Ubuntu:Pro:16.04:LTS

    Versions
    • 3.0.3-1
    • 3.2-1
    • 3.2-1build1
    • 3.2-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pymongo Ubuntu:Pro:18.04:LTS

    Versions
    • 3.4.0-1build2
    • 3.6.1+dfsg1-1
    • 3.6.1+dfsg1-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pymongo Ubuntu:20.04:LTS

    Versions
    • 3.7.1-1.1
    • 3.7.1-1.1build1
    • 3.10.1-0ubuntu2
    • 3.10.1-0ubuntu2.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pymongo Ubuntu:22.04:LTS

    Versions
    • 3.11.0-1build2
    • 3.11.0-1build3
    • 3.11.0-1build4
    • 3.11.0-1ubuntu0.22.04.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pymongo Ubuntu:24.04:LTS

    Versions
    • 3.11.0-1build6
    • 3.11.0-1build7
    • 3.11.0-1build8
    • 3.11.0-1ubuntu0.24.04.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pymongo Ubuntu:26.10

    Versions
    • 4.16.0-1build1
    • 4.17.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pymongo Ubuntu:26.04:LTS

    Versions
    • 4.10.1-6
    • 4.15.3-1
    • 4.15.3-2
    • 4.15.5-1
    • 4.16.0-1
    • 4.16.0-1build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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