Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2026-55654
Red Hat Red Hat Enterprise Linux 10 — Openssh: heap out-of-bounds read in red hat enterprise linux versions of openssh gssapi indicator cleanup due to missing null sentinel termination
AV AC PR UI S C I A CVSS EPSS %ile KEV
N H N N U N N L 3.7 .0065 49.5 —
AFFECTED
Product Versions Fixed
Red Hat Enterprise Linux 10 unspecified 0:9.9p1-25.el10_2
Red Hat Enterprise Linux 9 unspecified 0:9.9p1-9.el9_8
Red Hat Enterprise Linux 9 unspecified 0:9.9p1-9.el9_8
Red Hat Hardened Images unspecified 10.3p1-6.hum1
Red Hat Update Infrastructure 5 unspecified 1786435483
Red Hat Update Infrastructure 5 unspecified 1786533529
Red Hat Update Infrastructure 5 unspecified 1787135742
Red Hat Update Infrastructure 5 unspecified 1787241260
Red Hat Enterprise Linux 6 unspecified —
Red Hat Enterprise Linux 7 unspecified —
+ 3 more
TIMELINE
Jun 16 Reserved by redhat
Jun 23 EXPLOIT PUBLISHED — CVE-2026-55654 (Red Hat Enterprise Linux 10). Public exploit reference added.
Jun 23 Published (CNA: redhat)
Aug 12 EXPLOIT PUBLISHED — CVE-2026-55654 (Red Hat Enterprise Linux 10). Public exploit reference added.
Aug 21 EXPLOIT PUBLISHED — CVE-2026-55654 (Red Hat Enterprise Linux 10). Public exploit reference added.
Aug 25 EXPLOIT PUBLISHED — CVE-2026-55654 (Red Hat Enterprise Linux 10). Public exploit reference added.
Sep 1 EXPLOIT PUBLISHED — CVE-2026-55654 (Red Hat Enterprise Linux 10). Public exploit reference added.
Sep 23 EXPLOIT PUBLISHED — CVE-2026-55654 (Red Hat Enterprise Linux 10). Public exploit reference added.
Sep 24 EXPLOIT PUBLISHED — CVE-2026-55654 (Red Hat Enterprise Linux 10). Public exploit reference added.
Description
A flaw was found in OpenSSH. This vulnerability, a heap out-of-bounds read, occurs during the cleanup of GSSAPI (Generic Security Service Application Programming Interface) indicators when a trailing NULL termination is missing in the auth-indicators array. A remote attacker, under specific configurations involving GSSAPI authentication and a Kerberos environment, could exploit this to cause the SSH authentication path to crash or abort. This leads to a denial of service (DoS), impacting the availability of the SSH service.
Lifecycle
Complete event history — 9 events, chronological
| Date | Event | Detail |
|---|
| June 16, 2026 | Reserved | Reserved by redhat |
| June 23, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-55654 (Red Hat Enterprise Linux 10). Public exploit reference added. |
| June 23, 2026 | Published | Published (CNA: redhat) |
| August 12, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-55654 (Red Hat Enterprise Linux 10). Public exploit reference added. |
| August 21, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-55654 (Red Hat Enterprise Linux 10). Public exploit reference added. |
| August 25, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-55654 (Red Hat Enterprise Linux 10). Public exploit reference added. |
| September 1, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-55654 (Red Hat Enterprise Linux 10). Public exploit reference added. |
| September 23, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-55654 (Red Hat Enterprise Linux 10). Public exploit reference added. |
| September 24, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-55654 (Red Hat Enterprise Linux 10). Public exploit reference added. |
Affected
Affected products and packages — 13 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | — | 0:9.9p1-25.el10_2 |
| Red Hat | Red Hat Enterprise Linux 9 | — | — | 0:9.9p1-9.el9_8 |
| Red Hat | Red Hat Enterprise Linux 9 | — | — | 0:9.9p1-9.el9_8 |
| Red Hat | Red Hat Hardened Images | — | — | 10.3p1-6.hum1 |
| Red Hat | Red Hat Update Infrastructure 5 | — | — | 1786435483 |
| Red Hat | Red Hat Update Infrastructure 5 | — | — | 1786533529 |
| Red Hat | Red Hat Update Infrastructure 5 | — | — | 1787135742 |
| Red Hat | Red Hat Update Infrastructure 5 | — | — | 1787241260 |
| Red Hat | Red Hat Enterprise Linux 6 | — | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-55654 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
