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
02 Description
Openssh: heap out-of-bounds read in red hat enterprise linux versions of openssh gssapi indicator cleanup due to missing null sentinel termination
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 0.65% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 50.6% of scored records. A rank, not a probability.
- NVD base score
- 3.7 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
- NVD analysis status
- Modified. NVD last modified this record on 2026-09-24.
- Red Hat severity
- Low. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-06-23 03:37Z4 MO AGO
- Last updated
- 2026-09-24 22:41Z1 MO AGO
- Reserved
- 2026-06-16
- Assigning CNA
- redhat
- Record state
- PUBLISHED
- Severity
- Low (CVSS 3.7)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
- Weaknesses
- CWE-125Out-of-bounds ReadBase
- Data version
- 5.2
- Document digest
- ecb5d39dd9af13fb462c8c39058e348310836a494085c3ad934ba2e081ba1a45
05 Affected products
06 References
- access.redhat.comRHSA-2026:36759https://access.redhat.com/errata/RHSA-2026:36759
- access.redhat.comRHSA-2026:47756https://access.redhat.com/errata/RHSA-2026:47756
- access.redhat.comRHSA-2026:47757https://access.redhat.com/errata/RHSA-2026:47757
- access.redhat.comRHSA-2026:54387https://access.redhat.com/errata/RHSA-2026:54387
- access.redhat.comRHSA-2026:58981https://access.redhat.com/errata/RHSA-2026:58981
- access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-55654
- bugzilla.redhat.comRHBZ#2462493https://bugzilla.redhat.com/show_bug.cgi?id=2462493
07 Fixed in
AlmaLinux 9
- openssh Fixed in 9.9p1-9.el9_8.alma.1
- openssh-askpass Fixed in 9.9p1-9.el9_8.alma.1
- openssh-clients Fixed in 9.9p1-9.el9_8.alma.1
- openssh-keycat Fixed in 9.9p1-9.el9_8.alma.1
- openssh-server Fixed in 9.9p1-9.el9_8.alma.1
- pam_ssh_agent_auth Fixed in 0.10.4-7.9.el9_8.alma.1
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 10
- openssh Fixed in 9.9p1-25.el10_2.alma.1
- openssh-askpass Fixed in 9.9p1-25.el10_2.alma.1
- openssh-clients Fixed in 9.9p1-25.el10_2.alma.1
- openssh-keycat Fixed in 9.9p1-25.el10_2.alma.1
- openssh-keysign Fixed in 9.9p1-25.el10_2.alma.1
- openssh-server Fixed in 9.9p1-25.el10_2.alma.1
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 9
- openssh Fixed in 9.9p1-9.el9_8.alma.1
- openssh-askpass Fixed in 9.9p1-9.el9_8.alma.1
- openssh-clients Fixed in 9.9p1-9.el9_8.alma.1
- openssh-keycat Fixed in 9.9p1-9.el9_8.alma.1
- openssh-server Fixed in 9.9p1-9.el9_8.alma.1
- pam_ssh_agent_auth Fixed in 0.10.4-7.9.el9_8.alma.1
Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 10
- openssh Fixed in 9.9p1-25.el10_2.alma.1
- openssh-askpass Fixed in 9.9p1-25.el10_2.alma.1
- openssh-clients Fixed in 9.9p1-25.el10_2.alma.1
- openssh-keycat Fixed in 9.9p1-25.el10_2.alma.1
- openssh-keysign Fixed in 9.9p1-25.el10_2.alma.1
- openssh-server Fixed in 9.9p1-25.el10_2.alma.1
Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- openssh No fix yet
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- openssh Fixed in 1:10.4p1-5
- openssh-gssapi No fix yet
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- openssh-ssh1 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- openssh-ssh1 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- openssh-ssh1 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- openssh-ssh1 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 25.10
- openssh No fix yet
- openssh-ssh1 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.04 LTS
- openssh-ssh1 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.10
- openssh-ssh1 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.