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TI-2026-27523 Aliases CVE-2026-35387GHSA-hpxh-vgmp-3qp6

OpenSSH before 10.3 can use unintended ECDSA algorithms.

Priority LOW 28CWE-670Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
High · Low · None
Fix status
Partial Red Hat: 28 fixed, 3 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.

Summary

OpenSSH before 10.3 can use unintended ECDSA algorithms. Listing of any ECDSA algorithm in PubkeyAcceptedAlgorithms or HostbasedAcceptedAlgorithms is misinterpreted to mean all ECDSA algorithms.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00241 15th percentileScored 2026-11-07
Fix Partial OpenSSH (OpenBSD): 10.3Red Hat: 17 advisoriesRed Hat: 28 fixed, 3 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
OpenBSDOpenSSHbefore 10.310.3Patch availableCNA
  • OpenSSH VendorOpenBSD Affected before 10.3 Fixed in 10.3 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*before 10.3VulnerableOpenBSD
  • cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:* Versions before 10.3 Vulnerable ·OpenBSD

Remediation

  • Fix · CNA OpenSSH (OpenBSD) Fixed in 10.3

Red Hat 17 advisories

  • RHSA-2026:74674 Released 2026-10-01 · Red Hat rating Important
    Red Hat AI Base Images 3.4.3 (Neuron)
    • Red Hat OpenShift AI 3.4 registry.redhat.io/rhai/base-image-neuron-rhel9
  • RHSA-2026:58981 Released 2026-08-24 · Red Hat rating Critical
    Red Hat Update Infrastructure 5.3 Technology Preview security update
    • Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-kubernetes-tp-rhel9, registry.redhat.io/rhui5/installer-tp-rhel9, registry.redhat.io/rhui5/rhua-tp-rhel9
  • RHSA-2026:25096 Released 2026-06-10 · Red Hat rating Important
    Red Hat AI Inference Server Model Optimization Tools 3.2.2 (cuda)
    • Red Hat AI Inference Server 3.2 registry.redhat.io/rhaiis/model-opt-cuda-rhel9
Show 14 more Red Hat advisories
  • RHSA-2026:22564 Released 2026-06-03 · Red Hat rating Important
    openssh update
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) openssh-askpass-8.7p1-38.el9_4.8, pam_ssh_agent_auth-0.10.4-5.38.el9_4.8
    • Red Hat Enterprise Linux BaseOS EUS (v.9.4) openssh-8.7p1-38.el9_4.8, openssh-clients-8.7p1-38.el9_4.8, openssh-keycat-8.7p1-38.el9_4.8 +1
  • RHSA-2026:22648 Released 2026-06-02 · Red Hat rating Important
    openssh security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) openssh-askpass-8.7p1-30.el9_2.11, pam_ssh_agent_auth-0.10.4-5.30.el9_2.11
    • Red Hat Enterprise Linux BaseOS E4S (v.9.2) openssh-8.7p1-30.el9_2.11, openssh-clients-8.7p1-30.el9_2.11, openssh-keycat-8.7p1-30.el9_2.11 +1
  • RHSA-2026:22329 Released 2026-06-01 · Red Hat rating Important
    openssh security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.4) openssh-8.0p1-7.el8_4.2, openssh-clients-8.0p1-7.el8_4.2, openssh-server-8.0p1-7.el8_4.2
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) openssh-8.0p1-7.el8_4.2, openssh-clients-8.0p1-7.el8_4.2, openssh-server-8.0p1-7.el8_4.2
  • RHSA-2026:21398 Released 2026-05-27 · Red Hat rating Important
    openssh security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) openssh-askpass-8.0p1-15.el8_6.5
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) openssh-askpass-8.0p1-15.el8_6.5
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) openssh-askpass-8.0p1-15.el8_6.5
    • Red Hat Enterprise Linux BaseOS AUS (v.8.6) openssh-8.0p1-15.el8_6.5, openssh-cavs-8.0p1-15.el8_6.5, openssh-clients-8.0p1-15.el8_6.5 +4
    • Red Hat Enterprise Linux BaseOS E4S (v.8.6) openssh-8.0p1-15.el8_6.5, openssh-cavs-8.0p1-15.el8_6.5, openssh-clients-8.0p1-15.el8_6.5 +4
    • Red Hat Enterprise Linux BaseOS TUS (v.8.6) openssh-8.0p1-15.el8_6.5, openssh-cavs-8.0p1-15.el8_6.5, openssh-clients-8.0p1-15.el8_6.5 +4
  • RHSA-2026:21298 Released 2026-05-27 · Red Hat rating Important
    openssh security update
    • Red Hat Enterprise Linux BaseOS E4S (v.8.8) openssh-8.0p1-20.el8_8.4, openssh-clients-8.0p1-20.el8_8.4, openssh-server-8.0p1-20.el8_8.4
    • Red Hat Enterprise Linux BaseOS TUS (v.8.8) openssh-8.0p1-20.el8_8.4, openssh-clients-8.0p1-20.el8_8.4, openssh-server-8.0p1-20.el8_8.4
  • RHSA-2026:21275 Released 2026-05-27 · Red Hat rating Critical
    Red Hat Update Infrastructure 5.1 security update
    • Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-rhel9, registry.redhat.io/rhui5/haproxy-rhel9, registry.redhat.io/rhui5/installer-rhel9 +1
  • RHSA-2026:19219 Released 2026-05-19 · Red Hat rating Important
    openssh security update
    • Red Hat Enterprise Linux AppStream (v. 9) openssh-askpass-9.9p1-7.el9_8, pam_ssh_agent_auth-0.10.4-7.7.el9_8
    • Red Hat Enterprise Linux BaseOS (v. 9) openssh-9.9p1-7.el9_8, openssh-clients-9.9p1-7.el9_8, openssh-keycat-9.9p1-7.el9_8 +1
  • RHSA-2026:19069 Released 2026-05-19 · Red Hat rating Important
    openssh security update
    • Red Hat Enterprise Linux AppStream (v. 10) openssh-askpass-9.9p1-23.el10_2, openssh-keysign-9.9p1-23.el10_2
    • Red Hat Enterprise Linux BaseOS (v. 10) openssh-9.9p1-23.el10_2, openssh-clients-9.9p1-23.el10_2, openssh-keycat-9.9p1-23.el10_2 +1
  • RHSA-2026:16059 Released 2026-05-11 · Red Hat rating Important
    openssh security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) openssh-askpass-8.7p1-45.el9_6.3, pam_ssh_agent_auth-0.10.4-5.45.el9_6.3
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) openssh-8.7p1-45.el9_6.3, openssh-clients-8.7p1-45.el9_6.3, openssh-keycat-8.7p1-45.el9_6.3 +1
  • RHSA-2026:14937 Released 2026-05-07 · Red Hat rating Important
    A Subscription Management tool for finding and reporting Red Hat product usage
    • Red Hat Discovery 2 registry.redhat.io/discovery/discovery-server-rhel9, registry.redhat.io/discovery/discovery-ui-rhel9
  • RHSA-2026:13383 Released 2026-05-04 · Red Hat rating Important
    openssh security update
    • Red Hat Enterprise Linux AppStream (v. 8) openssh-askpass-8.0p1-29.el8_10
    • Red Hat Enterprise Linux BaseOS (v. 8) openssh-8.0p1-29.el8_10, openssh-cavs-8.0p1-29.el8_10, openssh-clients-8.0p1-29.el8_10 +4
  • RHSA-2026:13381 Released 2026-05-04 · Red Hat rating Important
    openssh security update
    • Red Hat Enterprise Linux AppStream (v. 9) openssh-askpass-8.7p1-49.el9_7, pam_ssh_agent_auth-0.10.4-5.49.el9_7
    • Red Hat Enterprise Linux BaseOS (v. 9) openssh-8.7p1-49.el9_7, openssh-clients-8.7p1-49.el9_7, openssh-keycat-8.7p1-49.el9_7 +1
  • RHSA-2026:13380 Released 2026-05-04 · Red Hat rating Important
    openssh security update
    • Red Hat Enterprise Linux AppStream (v. 10) openssh-askpass-9.9p1-14.el10_1, openssh-keysign-9.9p1-14.el10_1
    • Red Hat Enterprise Linux BaseOS (v. 10) openssh-9.9p1-14.el10_1, openssh-clients-9.9p1-14.el10_1, openssh-keycat-9.9p1-14.el10_1 +1
  • RHSA-2026:12389 Released 2026-04-30 · Red Hat rating Important
    openssh security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) openssh-askpass-9.9p1-7.el10_0.3, openssh-keysign-9.9p1-7.el10_0.3
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) openssh-9.9p1-7.el10_0.3, openssh-clients-9.9p1-7.el10_0.3, openssh-keycat-9.9p1-7.el10_0.3 +1

Fixed in the same release

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

  • Release ·

    OpenBSD OpenSSH 10.3

    5 records Highest priority Priority LOW 5 LOW

    Other records, highest priority first

    • TI-2026-27521 In OpenSSH before 10.3, a file downloaded by scp may be installed setuid or setgid, an…Priority LOW 38
    • TI-2026-27522 In OpenSSH before 10.3, command execution can occur via shell metacharacters in a…Priority LOW 37
    • TI-2026-27550 OpenSSH before 10.3 mishandles the authorized_keys principals option in uncommon…Priority LOW 35
    Show all 5 records →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 7AffectedNo fix yet: Fix deferred
Red Hat OpenShift Container Platform 4AffectedNo fix yet: Fix deferred
Red Hat AI Inference Server 3.2Fixed RHSA-2026:25096
Red Hat Discovery 2Fixed RHSA-2026:14937
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:13380, RHSA-2026:19069
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:13383
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:13381, RHSA-2026:19219
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2026:21398
Red Hat Enterprise Linux AppStream E4S (v.8.6)Fixed RHSA-2026:21398
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:22648
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:12389
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2026:22564
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:16059
Red Hat Enterprise Linux AppStream TUS (v.8.6)Fixed RHSA-2026:21398
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:13380, RHSA-2026:19069
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:13383
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:13381, RHSA-2026:19219
Red Hat Enterprise Linux BaseOS AUS (v.8.4)Fixed RHSA-2026:22329
Red Hat Enterprise Linux BaseOS AUS (v.8.6)Fixed RHSA-2026:21398
Red Hat Enterprise Linux BaseOS E4S (v.8.6)Fixed RHSA-2026:21398
Red Hat Enterprise Linux BaseOS E4S (v.8.8)Fixed RHSA-2026:21298
Red Hat Enterprise Linux BaseOS E4S (v.9.2)Fixed RHSA-2026:22648
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:12389
Red Hat Enterprise Linux BaseOS EUS (v.9.4)Fixed RHSA-2026:22564
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2026:16059
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)Fixed RHSA-2026:22329
Red Hat Enterprise Linux BaseOS TUS (v.8.6)Fixed RHSA-2026:21398
Red Hat Enterprise Linux BaseOS TUS (v.8.8)Fixed RHSA-2026:21298
Red Hat OpenShift AI 3.4Fixed RHSA-2026:74674
Red Hat Update Infrastructure 5Fixed RHSA-2026:21275, RHSA-2026:58981
Not affected: 22 products
  • Red Hat Discovery 2
  • Red Hat Enterprise Linux AppStream AUS (v.8.4)
  • Red Hat Enterprise Linux AppStream AUS (v.8.6)
  • Red Hat Enterprise Linux AppStream E4S (v.8.6)
  • Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • Red Hat Enterprise Linux AppStream EUS (v.9.4)
  • Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)
  • Red Hat Enterprise Linux AppStream TUS (v.8.6)
  • Red Hat Enterprise Linux AppStream TUS (v.8.8)
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4)
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6)
  • Red Hat Enterprise Linux BaseOS E4S (v.8.6)
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4)
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6)
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6)
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8)
  • Red Hat Update Infrastructure 5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-35387
  2. 2026-10-03 Alias added: GHSA-hpxh-vgmp-3qp6

References

Advisory 2

Other 1

  • TI-2023-19792 The PKCS#11 feature in ssh-agent in OpenSSH before 9.3p2 has an insufficiently… CVSS 3.1CRITICAL 9.8
  • TI-2024-05929 Openssh: regresshion - race condition in ssh allows rce/dos CVSS 3.1HIGH 8.1
  • TI-2023-10601 OpenSSH server (sshd) 9.1 introduced a double-free vulnerability during… CVSS 3.1MEDIUM 6.5
  • TI-2018-11033 OpenSSH through 7.7 is prone to a user enumeration vulnerability due to not delaying… CVSS 3.1MEDIUM 5.9
  • TI-2016-08105 Untrusted search path vulnerability in ssh-agent.c in ssh-agent in OpenSSH before 7.4… CVSS 3.1HIGH 7.3
  • TI-2023-28040 In ssh in OpenSSH before 9.6, OS command injection might occur if a user name or host… CVSS 3.1MEDIUM 6.5
See all 145 →

Sources

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