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CVE-2026-53585

CVE-2026-53585 · libgit2: Unbounded Memory Allocation via Delta Object Result-Size Header

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

libgit2 is a portable C implementation of the Git core methods provided as a linkable library with a solid API, allowing to build Git functionality into your application. Prior to 1.8.6 and 1.9.5, git_delta_apply in src/libgit2/delta.c trusts the attacker-controlled res_sz value parsed by hdr_sz from a delta object header and passes that amount to git__malloc before validating delta instructions. Malicious pack data supplied through git_clone, git_fetch, git_remote_fetch, git_indexer_append, or a local attacker-supplied repository can use a very small multi-level OFS_DELTA chain to retain extremely large allocations and exhaust memory. This issue is fixed in versions 1.8.6 and 1.9.5.

CVSS 5.3 · Medium · EPSS 0.4% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • libgit2

    Versions
    • < 1.8.6: Affected
    • >= 1.9.0, < 1.9.5: Affected

    No fix published

  • libgit2 Debian:12

    Versions
    • 1.5.1+ds-1
    • 1.5.1+ds-1+deb12u1
    Affected ranges
    • ECOSYSTEM: < 1.5.1+ds-1+deb12u2

    Update to 1.5.1+ds-1+deb12u2

  • libgit2 Debian:13

    Versions
    • 1.9.0+ds-2
    Affected ranges
    • ECOSYSTEM: < 1.9.0+ds-2+deb13u1

    Update to 1.9.0+ds-2+deb13u1

  • libgit2 Debian:14

    Versions
    • 1.9.0+ds-2
    • 1.9.1+ds-1
    • 1.9.2+ds-1
    • 1.9.2+ds-2
    • 1.9.2+ds-3
    • 1.9.2+ds-4
    • 1.9.2+ds-5
    • 1.9.2+ds-6
    • 1.9.2+ds-7
    • 1.9.2+ds-8
    • 1.9.2+ds-9
    • 1.9.3+ds-1
    • 1.9.4+ds-1
    Affected ranges
    • ECOSYSTEM: < 1.9.6+ds-1

    Update to 1.9.6+ds-1

  • libgit2 Ubuntu:Pro:14.04:LTS

    Versions
    • 0.19.0-2
    • 0.19.0-2ubuntu0.4
    • 0.19.0-2ubuntu0.4+esm1
    Affected ranges
    • ECOSYSTEM: < 0.19.0-2ubuntu0.4+esm2

    Update to 0.19.0-2ubuntu0.4+esm2

  • libgit2 Ubuntu:Pro:16.04:LTS

    Versions
    • 0.22.2-2
    • 0.23.1-1
    • 0.24.1-2
    • 0.24.1-2ubuntu0.2
    • 0.24.1-2ubuntu0.2+esm1
    • 0.24.1-2ubuntu0.2+esm2
    Affected ranges
    • ECOSYSTEM: < 0.24.1-2ubuntu0.2+esm3

    Update to 0.24.1-2ubuntu0.2+esm3

  • libgit2 Ubuntu:Pro:18.04:LTS

    Versions
    • 0.25.1+really0.24.6-1
    • 0.26.0+dfsg.1-1.1
    • 0.26.0+dfsg.1-1.1build1
    • 0.26.0+dfsg.1-1.1ubuntu0.2
    • 0.26.0+dfsg.1-1.1ubuntu0.2+esm1
    Affected ranges
    • ECOSYSTEM: < 0.26.0+dfsg.1-1.1ubuntu0.2+esm2

    Update to 0.26.0+dfsg.1-1.1ubuntu0.2+esm2

  • libgit2 Ubuntu:Pro:20.04:LTS

    Versions
    • 0.27.7+dfsg.1-0.2build1
    • 0.28.3+dfsg.1-1
    • 0.28.3+dfsg.1-1ubuntu1
    • 0.28.4+dfsg.1-2
    • 0.28.4+dfsg.1-2ubuntu0.1
    Affected ranges
    • ECOSYSTEM: < 0.28.4+dfsg.1-2ubuntu0.1+esm1

    Update to 0.28.4+dfsg.1-2ubuntu0.1+esm1

  • libgit2 Ubuntu:Pro:22.04:LTS

    Versions
    • 1.1.0+dfsg.1-4
    • 1.1.0+dfsg.1-4.1
    • 1.1.0+dfsg.1-4.1build1
    • 1.1.0+dfsg.1-4.1ubuntu0.1
    Affected ranges
    • ECOSYSTEM: < 1.1.0+dfsg.1-4.1ubuntu0.1+esm1

    Update to 1.1.0+dfsg.1-4.1ubuntu0.1+esm1

  • libgit2 Ubuntu:24.04:LTS

    Versions
    • 1.5.1+ds-1ubuntu1
    • 1.7.1+ds-2ubuntu1
    • 1.7.2+ds-1ubuntu1
    • 1.7.2+ds-1ubuntu2
    • 1.7.2+ds-1ubuntu3
    Affected ranges
    • ECOSYSTEM: < 1.7.2+ds-1ubuntu3.1

    Update to 1.7.2+ds-1ubuntu3.1

  • libgit2 Ubuntu:26.04:LTS

    Versions
    • 1.9.0+ds-2ubuntu2
    • 1.9.1+ds-1ubuntu1
    Affected ranges
    • ECOSYSTEM: < 1.9.1+ds-1ubuntu1.1

    Update to 1.9.1+ds-1ubuntu1.1

Original sources

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