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CVE-2026-0966

CVE-2026-0966 · Libssh: libssh: denial of service via zero-length input in ssh_get_hexa()

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

A flaw was found in libssh. The API function `ssh_get_hexa()` is vulnerable to a denial of service when processing zero-length input. This can be exploited remotely by an attacker during GSSAPI (Generic Security Service Application Program Interface) authentication if the server's logging verbosity is set to `SSH_LOG_PACKET (3)` or higher. Successful exploitation could lead to a self-Denial of Service of the per-connection daemon process.

CVSS 6.5 · Medium · EPSS 0.6% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • red hat enterprise linux 10

    Versions
    • ≥ 0:0.12.0-2.el10: Not affected (rpm)

    No fix published

  • red hat enterprise linux 9

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

    No fix published

  • red hat hardened images

    Versions
    • ≥ 0.12.0-1.1.hum1: Not affected (rpm)

    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 hardened images

    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
    • 0.10.6-0+deb12u2
    Affected ranges
    • ECOSYSTEM: < 0.10.6-0+deb12u3

    Update to 0.10.6-0+deb12u3

  • libssh Debian:13

    Versions
    • 0.11.2-1
    • 0.11.2-1+deb13u1
    • 0.11.3-1
    Affected ranges
    • ECOSYSTEM: < 0.11.5-0+deb13u1

    Update to 0.11.5-0+deb13u1

  • libssh Debian:14

    Versions
    • 0.11.2-1
    • 0.11.3-1
    Affected ranges
    • ECOSYSTEM: < 0.12.0-1

    Update to 0.12.0-1

  • libssh Ubuntu:Pro:16.04:LTS

    Versions
    • 0.6.3-3ubuntu3
    • 0.6.3-4.1
    • 0.6.3-4.2
    • 0.6.3-4.2ubuntu1
    • 0.6.3-4.3
    • 0.6.3-4.3ubuntu0.1
    • 0.6.3-4.3ubuntu0.2
    • 0.6.3-4.3ubuntu0.5
    • 0.6.3-4.3ubuntu0.6
    • 0.6.3-4.3ubuntu0.6+esm1
    • 0.6.3-4.3ubuntu0.6+esm2
    • 0.6.3-4.3ubuntu0.6+esm3
    Affected ranges
    • ECOSYSTEM: < 0.6.3-4.3ubuntu0.6+esm4

    Update to 0.6.3-4.3ubuntu0.6+esm4

  • 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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