No exploitation reportedFix available

CVE-2026-106553

Q: Is CVE-2026-106553 actively exploited?

Active exploitation of CVE-2026-106553 has not been confirmed. Its EPSS score was 0.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2026-106553?

CVE-2026-106553 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

No exploitation reported by the sources we read.

Published2026-10-06
Fixed in10.6
WeaknessCWE-669

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In sshd in OpenSSH before 10.6, credentials can incorrectly persist after failure of a GSSAPIAuthentication authentication attempt.

Timeline

dates in UTC

2026-10-0621:17CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-106553?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-106553?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

OpenSSH

Branch	Affected	Fixed in	Source
10.6	< 10.6	10.6	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

CVE-2026-106553 Red Hat Product Security22 products fixed · 42 known affected
openssh: OpenSSH: Credential disclosure via failed GSSAPI authentication
openssh as a component of Red Hat Enterprise Linux 10 · openssh-askpass as a component of Red Hat Enterprise Linux 10 · openssh-clients as a component of Red Hat Enterprise Linux 10 · +39 more
RHSA-2026:84849 Red Hat Product Security22 products fixed
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Full record on NVD

Fix

Update OpenSSH to 10.6
Vendor fix Red Hat Product Security RHSA-2026:84849 · 22 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
Workaround from the vendor Red Hat Product Security RHSA-2026:84849 · 22 productsSet GSSAPIAuthentication to no in the sshd configuration (e.g. /etc/ssh/sshd_config) and reload or restart the sshd service. This flaw only occurs when GSSAPI authentication is enabled, which is not the default configuration, so deployments that do not rely on GSSAPI authentication can disable it t…
No fix available, says the vendor Red Hat Product Security CVE-2026-106553 · 42 productsAffected

Advisories and patches

www.openssh.orgRelease Notes

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2026-10-07
OpenCVESSVC decisionnone—
CNACVSS 3.12.2read 2026-10-23
NVDCVSS 3.17.5read 2026-10-23
CNAweakness (CWE)CWE-669read 2026-10-23
FIRST EPSSEPSS score0.1 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published: 2026-10-06
Last Modified: 2026-10-13
NVD status: Analyzed

Frequently asked questions

What is CVE-2026-106553?

In sshd in OpenSSH before 10.6, credentials can incorrectly persist after failure of a GSSAPIAuthentication authentication attempt.

Is CVE-2026-106553 actively exploited?

Active exploitation of CVE-2026-106553 has not been confirmed. Its EPSS score was 0.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-106553?

CVE-2026-106553 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

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