CVE-2026-55654
published 2026-06-23CVE-2026-55654: A flaw was found in OpenSSH. This vulnerability, a heap out-of-bounds read, occurs during the cleanup of GSSAPI (Generic Security Service Application…
PriorityP418low3.7CVSS 3.1
AVNACHPRNUINSUCNINAL
EPSS
0.65%
51.0th percentile
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.
Affected
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
CVSS provenance
nvdv3.13.7LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
vendor_redhat3.7LOW
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
Red Hat
openssh: Heap out-of-bounds read in Red Hat Enterprise Linux versions of OpenSSH GSSAPI indicator cleanup due to missing NULL sentinel termination
vendor_redhat·2026-06-22·CVSS 3.7
CVE-2026-55654 [LOW] CWE-125 openssh: Heap out-of-bounds read in Red Hat Enterprise Linux versions of OpenSSH GSSAPI indicator cleanup due to missing NULL sentinel termination
openssh: Heap out-of-bounds read in Red Hat Enterprise Linux versions of OpenSSH GSSAPI indicator cleanup due to missing NULL sentinel termination
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.
Statement: This flaw is rated Low. A heap out-of-bounds read in OpenSSH's GSSAPI authentication component can lead to a d
GHSA
A flaw was found in OpenSSH.
ghsa_unreviewed·2026-06-23
CVE-2026-55654 [LOW] CWE-125 A flaw was found in OpenSSH.
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.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-55654 openssh: Heap out-of-bounds read in Red Hat Enterprise Linux versions of OpenSSH GSSAPI indicator cleanup due to missing NULL sentinel termination [fedora-all]
bugzilla·2026-09-24·CVSS 3.7
CVE-2026-55654 [LOW] CVE-2026-55654 openssh: Heap out-of-bounds read in Red Hat Enterprise Linux versions of OpenSSH GSSAPI indicator cleanup due to missing NULL sentinel termination [fedora-all]
CVE-2026-55654 openssh: Heap out-of-bounds read in Red Hat Enterprise Linux versions of OpenSSH GSSAPI indicator cleanup due to missing NULL sentinel termination [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
AI_ONLY_REPORT
package: openssh-10.2p1-10.1.hum1
Summary: Heap out-of-bounds read in GSSAPI indicator cleanup: missing
trailing `NULL` termination in the GSSAPI auth-indicators array allows
sentinel-based consumers to read past the allocated pointer array and may
trigger an invalid free during cleanup.
Requirements to exploit: An attacker needs network access to SSH on
`openssh-10.2p1-10.1.hum1`
Bugzilla
CVE-2026-55654 openssh: Heap out-of-bounds read in Red Hat Enterprise Linux versions of OpenSSH GSSAPI indicator cleanup due to missing NULL sentinel termination
bugzilla·2026-04-26
CVE-2026-55654 [LOW] CVE-2026-55654 openssh: Heap out-of-bounds read in Red Hat Enterprise Linux versions of OpenSSH GSSAPI indicator cleanup due to missing NULL sentinel termination
CVE-2026-55654 openssh: Heap out-of-bounds read in Red Hat Enterprise Linux versions of OpenSSH GSSAPI indicator cleanup due to missing NULL sentinel termination
AI_ONLY_REPORT
package: openssh-10.2p1-10.1.hum1
Summary: Heap out-of-bounds read in GSSAPI indicator cleanup: missing
trailing `NULL` termination in the GSSAPI auth-indicators array allows
sentinel-based consumers to read past the allocated pointer array and may
trigger an invalid free during cleanup.
Requirements to exploit: An attacker needs network access to SSH on
`openssh-10.2p1-10.1.hum1` built with GSSAPI support and deployed with
`GSSAPIAuthentication yes`; in this tree that option defaults to disabled.
The Kerberos environment must provide a ticket containing at least one
authenticated `auth-indicators` value, and execu
https://access.redhat.com/errata/RHSA-2026:36759https://access.redhat.com/errata/RHSA-2026:47756https://access.redhat.com/errata/RHSA-2026:47757https://access.redhat.com/errata/RHSA-2026:54387https://access.redhat.com/errata/RHSA-2026:58981https://access.redhat.com/security/cve/CVE-2026-55654https://bugzilla.redhat.com/show_bug.cgi?id=2462493
2026-06-23
Published