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TI-2026-74644 Aliases CVE-2026-110925GHSA-h54q-2vm3-97qv

OpenSSH passes unescaped username characters into the shell via %u

Priority LOW 24CWE-78Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
Low · Low · None
Fix status
Partial Red Hat: 1 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-78.

Summary

OpenSSH affects Red Hat Hardened Images and Red Hat Enterprise Linux 8. A username entered on the ssh command line can keep '$' or a non-trailing backslash, and when ProxyCommand or Match exec expands %u, those characters are passed into the shell (CWE-78). An unauthenticated remote attacker needs a user to take an action, and the impact is limited to confidentiality and integrity.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

A flaw was found in OpenSSH. A username entered on the ssh command line can still contain '$' or a non-trailing backslash. When a configuration expands %u inside ProxyCommand or Match exec, those characters are passed into the shell.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00236 13th percentileScored 2026-10-20
Fix Partial Red Hat: 1 advisoryRed Hat: 1 fixed, 1 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 Hardened Images—10.5p1-1.2.hum1Patch availableCNA
Red HatRed Hat Enterprise Linux 10——Not affectedCNA
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 Enterprise Linux 9——Not affectedCNA
Red HatRed Hat Hardened Images——Not affectedCNA
Red HatRed Hat OpenShift Container Platform 4——Not affectedCNA
Red HatRed Hat OpenShift Container Platform 4——Not affectedCNA
  • Red Hat Hardened Images VendorRed Hat Affected — Fixed in 10.5p1-1.2.hum1 Patch available CNA
  • Red Hat Enterprise Linux 10 VendorRed Hat Affected — Fixed in — Not affected 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 Enterprise Linux 9 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat Hardened Images VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat OpenShift Container Platform 4 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat OpenShift Container Platform 4 VendorRed Hat Affected — Fixed in — Not affected CNA

CPE names CNA · 7

CPEVersionsRoleVendor
cpe:/a:redhat:hummingbird:11—Red Hat
cpe:/o:redhat:enterprise_linux:1010—Red Hat
cpe:/o:redhat:enterprise_linux:66—Red Hat
cpe:/o:redhat:enterprise_linux:77—Red Hat
cpe:/o:redhat:enterprise_linux:88—Red Hat
cpe:/o:redhat:enterprise_linux:99—Red Hat
cpe:/a:redhat:openshift:44—Red Hat
  • cpe:/a:redhat:hummingbird:1 Versions 1 — ·Red Hat
  • cpe:/o:redhat:enterprise_linux:10 Versions 10 — ·Red Hat
  • cpe:/o:redhat:enterprise_linux:6 Versions 6 — ·Red Hat
  • cpe:/o:redhat:enterprise_linux:7 Versions 7 — ·Red Hat
  • cpe:/o:redhat:enterprise_linux:8 Versions 8 — ·Red Hat
  • cpe:/o:redhat:enterprise_linux:9 Versions 9 — ·Red Hat
  • cpe:/a:redhat:openshift:4 Versions 4 — ·Red Hat

Remediation

Red Hat Hardened Images is fixed in 10.5p1-1.2.hum1 by RHSA-2026:82247. The sources list no fixed version for Red Hat Enterprise Linux 8.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Red Hat 1 advisory

  • RHSA-2026:82247 Released 2026-10-13 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images openssh-10.5p1-1.2.hum1@aarch64, openssh-10.5p1-1.2.hum1@s390x, openssh-10.5p1-1.2.hum1@src +19

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-2026:82247

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2026-74643 Path traversal in OpenSSH sftp lets a server write outside the target directoryPriority LOW 29
    • TI-2026-74645 OpenSSH shared compression dictionary leaks plaintext across channelsPriority LOW 24
    Show all 3 records → Advisory →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 8AffectedNo fix yet
Red Hat Hardened ImagesFixed RHSA-2026:82247
Not affected: 7 products
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 9
  • Red Hat Hardened Images
  • Red Hat OpenShift Container Platform 4
  • Red Hat OpenShift Container Platform 5

Timeline

  1. 2026-10-15 Threatist record created from CVE-2026-110925
  2. 2026-10-16 Alias added: GHSA-h54q-2vm3-97qv
  3. 2026-10-16 Fix available: RHSA-2026:82247 · Red Hat
  4. 2026-10-16 Fix available: Red Hat Hardened Images · Red Hat
  5. 2026-10-16 CVSS score added · Red Hat
  6. 2026-10-20 Affected versions changed · CNA
  7. 2026-10-20 Affected versions changed · Red Hat
  8. 2026-11-04 Affected versions changed · Red Hat

References

Advisory 1

Other 2

  • TI-2019-15875 Protection mechanism failure in Jenkins Pipeline: Groovy Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-15874 Protection mechanism failure in Jenkins Script Security Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-08259 Underflow in PHP-FPM can lead to RCE KEVCVSS 3.1CRITICAL 9.8
  • TI-2019-05363 Code injection in Elastic Kibana KEVCVSS 3.1CRITICAL 10.0
  • TI-2019-03949 Out-of-bounds write in ESXi and Horizon DaaS KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-16080 A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153… KEVCVSS 3.1CRITICAL 9.8
See all 7413 →

Sources

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