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TI-2026-00733 Aliases CVE-2026-0967GHSA-6jpg-fr24-wpvf

Libssh: libssh: denial of service via inefficient regular expression processing

Priority LOW 24CWE-1333Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 4 fixed, 2 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-1333.

Summary

A flaw was found in libssh. A remote attacker, by controlling client configuration files or known_hosts files, could craft specific hostnames that when processed by the `match_pattern()` function can lead to inefficient regular expression backtracking. This can cause timeouts and resource exhaustion, resulting in a Denial of Service (DoS) for the client.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00231 14th percentileScored 2026-11-07
Fix Partial Red Hat: 2 advisoriesRed Hat: 4 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Red HatRed Hat Enterprise Linux 10—0.12.0-2.el10Patch availableCNA
Red HatRed Hat Enterprise Linux 9—0.10.4-18.el9Patch availableCNA
Red HatRed Hat Enterprise Linux 9—0.10.4-18.el9Patch availableCNA
Red HatRed Hat Enterprise Linux 6——Not affectedCNA
Red HatRed Hat Enterprise Linux 7——Not affectedCNA
Red HatRed Hat Enterprise Linux 8——No fix listedCNA
Red HatRed Hat Hardened Images——Not affectedCNA
Red HatRed Hat OpenShift Container Platform 4——No fix listedCNA
Red HatRed Hat OpenShift Container Platform 4——No fix listedCNA
  • Red Hat Enterprise Linux 10 VendorRed Hat Affected — Fixed in 0.12.0-2.el10 Patch available CNA
  • Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 0.10.4-18.el9 Patch available CNA
  • Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 0.10.4-18.el9 Patch available CNA
  • Red Hat Enterprise Linux 6 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Red Hat Hardened Images VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat OpenShift Container Platform 4 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Red Hat OpenShift Container Platform 4 VendorRed Hat Affected — Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:*up to 0.11.3Vulnerablelibssh
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*9.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*10.0VulnerableRed Hat
  • cpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:* Versions up to 0.11.3 Vulnerable ·libssh
  • cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Red Hat

Remediation

Red Hat 2 advisories

  • RHSA-2026:18683 Released 2026-05-19 · Red Hat rating Moderate
    libssh security update
    • Red Hat Enterprise Linux AppStream (v. 9) libssh-devel-0.10.4-18.el9
    • Red Hat Enterprise Linux BaseOS (v. 9) libssh-0.10.4-18.el9, libssh-config-0.10.4-18.el9
  • RHSA-2026:18160 Released 2026-05-19 · Red Hat rating Moderate
    libssh security update
    • Red Hat Enterprise Linux AppStream (v. 10) libssh-devel-0.12.0-2.el10
    • Red Hat Enterprise Linux BaseOS (v. 10) libssh-0.12.0-2.el10, libssh-config-0.12.0-2.el10

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 and 5 more products — RHSA-2026:18160

    5 records Highest priority Priority MEDIUM 1 MEDIUM, 4 LOW

    Other records, highest priority first

    • TI-2026-00732 Libssh: libssh: denial of service via zero-length input in ssh_get_hexa()Priority MEDIUM 43
    • TI-2026-00730 Libssh: improper sanitation of paths received from scp serversPriority LOW 28
    • TI-2026-00734 Libssh: libssh: denial of service due to malformed sftp messagePriority LOW 16
    Show all 5 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat OpenShift Container Platform 4AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:18160
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:18683
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:18160
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:18683
Not affected: 3 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Hardened Images

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-0967
  2. 2026-10-03 Alias added: GHSA-6jpg-fr24-wpvf

References

Advisory 4

Other 1

  • TI-2019-08259 Underflow in PHP-FPM can lead to RCE KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-10530 Code injection in [UNKNOWN] RichFaces KEVCVSS 3.1CRITICAL 9.8
  • TI-2014-05975 GNU Bash through 4.3 bash43-025 processes trailing strings after certain malformed… KEVCVSS 3.1CRITICAL 9.8
  • TI-2014-05157 GNU Bash through 4.3 processes trailing strings after function definitions in the values… KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-23530 Sudo before 1.9.17p1 allows local users to obtain root access because /etc/nsswitch.conf… KEVCVSS 3.1CRITICAL 9.3
  • TI-2021-17490 mod_proxy SSRF KEVCVSS 3.1CRITICAL 9.0
See all 1955 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences