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CVE-2025-8277

CVE-2025-8277 · Libssh: memory exhaustion via repeated key exchange in libssh

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

A flaw was found in libssh's handling of key exchange (KEX) processes when a client repeatedly sends incorrect KEX guesses. The library fails to free memory during these rekey operations, which can gradually exhaust system memory. This issue can lead to crashes on the client side, particularly when using libgcrypt, which impacts application stability and availability.

CVSS 3.1 · Low · EPSS 0.4% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • red hat enterprise linux 9

    Versions
    • ≥ 0:0.10.4-18.el9: Not affected (rpm)

    No fix published

  • red hat enterprise linux 10

    No fix published

  • red hat enterprise linux 6

    No fix published

  • red hat enterprise linux 7

    No fix published

  • red hat enterprise linux 8

    No fix published

  • red hat openshift container platform 4

    No fix published

  • libssh Debian:12

    Versions
    • 0.10.5-2
    • 0.10.5-3
    • 0.10.5-3+hurd.1
    • 0.10.6-0+deb12u1
    Affected ranges
    • ECOSYSTEM: < 0.10.6-0+deb12u2

    Update to 0.10.6-0+deb12u2

  • libssh Debian:13

    Versions
    • 0.11.2-1
    Affected ranges
    • ECOSYSTEM: < 0.11.2-1+deb13u1

    Update to 0.11.2-1+deb13u1

  • libssh Debian:14

    Versions
    • 0.11.2-1
    Affected ranges
    • ECOSYSTEM: < 0.11.3-1

    Update to 0.11.3-1

  • libssh Ubuntu:Pro:18.04:LTS

    Versions
    • 0.7.5-1
    • 0.8.0~20170825.94fa1e38-1
    • 0.8.0~20170825.94fa1e38-1build1
    • 0.8.0~20170825.94fa1e38-1ubuntu0.1
    • 0.8.0~20170825.94fa1e38-1ubuntu0.2
    • 0.8.0~20170825.94fa1e38-1ubuntu0.5
    • 0.8.0~20170825.94fa1e38-1ubuntu0.6
    • 0.8.0~20170825.94fa1e38-1ubuntu0.7
    • 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm3
    • 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm4
    • 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm5
    Affected ranges
    • ECOSYSTEM: < 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm6

    Update to 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm6

  • libssh Ubuntu:Pro:20.04:LTS

    Versions
    • 0.9.0-1ubuntu1
    • 0.9.0-1ubuntu4
    • 0.9.0-1ubuntu5
    • 0.9.3-2ubuntu1
    • 0.9.3-2ubuntu2
    • 0.9.3-2ubuntu2.1
    • 0.9.3-2ubuntu2.2
    • 0.9.3-2ubuntu2.3
    • 0.9.3-2ubuntu2.4
    • 0.9.3-2ubuntu2.5
    • 0.9.3-2ubuntu2.5+esm1
    • 0.9.3-2ubuntu2.5+esm2
    Affected ranges
    • ECOSYSTEM: < 0.9.3-2ubuntu2.5+esm3

    Update to 0.9.3-2ubuntu2.5+esm3

  • libssh Ubuntu:22.04:LTS

    Versions
    • 0.9.6-1
    • 0.9.6-1build1
    • 0.9.6-2
    • 0.9.6-2build1
    • 0.9.6-2ubuntu0.22.04.1
    • 0.9.6-2ubuntu0.22.04.2
    • 0.9.6-2ubuntu0.22.04.3
    • 0.9.6-2ubuntu0.22.04.4
    • 0.9.6-2ubuntu0.22.04.5
    Affected ranges
    • ECOSYSTEM: < 0.9.6-2ubuntu0.22.04.6

    Update to 0.9.6-2ubuntu0.22.04.6

  • libssh Ubuntu:24.04:LTS

    Versions
    • 0.10.5-3ubuntu1
    • 0.10.5-3ubuntu2
    • 0.10.6-2
    • 0.10.6-2build1
    • 0.10.6-2build2
    • 0.10.6-2ubuntu0.1
    • 0.10.6-2ubuntu0.2
    Affected ranges
    • ECOSYSTEM: < 0.10.6-2ubuntu0.3

    Update to 0.10.6-2ubuntu0.3

  • libssh Ubuntu:25.10

    Versions
    • 0.11.1-1
    • 0.11.1-2
    • 0.11.2-1
    • 0.11.2-1build1
    • 0.11.2-1ubuntu0.1
    Affected ranges
    • ECOSYSTEM: < 0.11.2-1ubuntu0.2

    Update to 0.11.2-1ubuntu0.2

Original sources

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