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CVE-2026-53586

CVE-2026-53586 · libgit2: HTTP transport can leak credentials to an offsite redirect target

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, the built-in HTTP transport in src/libgit2/transports/http.c follows an offsite initial redirect, and handle_remote_auth and handle_auth pass transport->owner->url instead of transport->server.url to the credential callback when the redirected host returns 401 Unauthorized. A callback that scopes credentials to the original trusted URL can therefore return GIT_CREDENTIAL_USERPASS_PLAINTEXT credentials that libgit2 stores in transport->server.cred and sends as an Authorization header to the redirected host. An attacker who controls a trusted Git host or an open redirect on that host can disclose HTTP Basic credentials, personal access tokens, or equivalent credentials. This issue is fixed in versions 1.8.6 and 1.9.5.

CVSS 6.5 · Medium · EPSS 0.3% · 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: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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