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Fencer Intel
medium 4.8

CVE-2026-73282 json

In ssh in OpenSSH before 10.5, a use-after-free for realloc data can occur if a certain pair of...

published 2mo ago modified 16d ago also EUVD-2026-56891 , GHSA-jwc3-6qvm-4r66 , JLSEC-2026-1328

cvss
4.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 5%
public exploits
0
none known

Summary

In ssh in OpenSSH before 10.5, a use-after-free for realloc data can occur if a certain pair of remote-forwarding operations are concurrent.

Patch / fix

  • julia OpenSSH_jll 10.5.1+0
  • OpenBSD OpenSSH 10.5
  • openssh Debian 14 1:10.5p1-1
  • openssh-gssapi Debian 14 1:10.5p1-1

debian advisories DEBIAN-CVE-2026-73282

  • openssh Ubuntu 22.04 LTS 1:8.9p1-3ubuntu0.17
  • openssh Ubuntu 24.04 LTS 1:9.6p1-3ubuntu13.19
  • openssh Ubuntu 26.04 LTS 1:10.2p1-2ubuntu3.6
  • openssh Ubuntu Pro 14.04 LTS 1:6.6p1-2ubuntu2.13+esm4
  • openssh Ubuntu Pro 16.04 LTS 1:7.2p2-4ubuntu2.10+esm10
  • openssh Ubuntu Pro 18.04 LTS 1:7.6p1-4ubuntu0.7+esm6
  • openssh Ubuntu Pro 20.04 LTS 1:8.2p1-4ubuntu0.13+esm3
  • openssh Ubuntu Pro FIPS-updates 24.04 LTS 1:9.6p1-3ubuntu13.19+Fips1

ubuntu advisories UBUNTU-CVE-2026-73282

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openssh hummingbird 1 10.5p1-1.hum1
  • openssh-keycat hummingbird 1 10.5p1-1.hum1
  • openssh-server hummingbird 1 10.5p1-1.hum1
  • openssh-askpass hummingbird 1 10.5p1-1.hum1
  • openssh-clients hummingbird 1 10.5p1-1.hum1
  • openssh-keysign hummingbird 1 10.5p1-1.hum1
  • openssh-sk-dummy hummingbird 1 10.5p1-1.hum1
  • openssh RHEL 8 8.0p1-33.el8_10

red hat advisories RHSA-2026:76748RHSA-2026:70719RHSA-2026:69266RHSA-2026:69130RHSA-2026:69129

  • openssh Linux Micro 6.1 9.6p1-slfo.1.1_7.1
  • openssh SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 9.6p1-150600.6.52.2
  • openssh-askpass-gnome SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Desktop Applications 15 SP7 9.6p1-150600.6.52.1
  • openssh SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +8 more 8.4p1-150300.3.68.2
  • openssh-askpass-gnome SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 8.4p1-150300.3.68.1
  • openssh Linux Micro 6.0 9.6p1-159998.1.1
  • openssh SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 7.2p2-81.43.1
  • openssh-askpass-gnome SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 7.2p2-81.43.1

suse advisories SUSE-SU-2026:24382-1SUSE-SU-2026:4827-1SUSE-SU-2026:4811-1SUSE-SU-2026:4686-1SUSE-SU-2026:24140-1SUSE-SU-2026:4614-1

  • openssh AlmaLinux 10 9.9p1-27.el10_2.alma.1
  • openssh-keycat AlmaLinux 10 9.9p1-27.el10_2.alma.1
  • openssh-server AlmaLinux 10 9.9p1-27.el10_2.alma.1
  • openssh-askpass AlmaLinux 10 9.9p1-27.el10_2.alma.1
  • openssh-clients AlmaLinux 10 9.9p1-27.el10_2.alma.1
  • openssh-keysign AlmaLinux 10 9.9p1-27.el10_2.alma.1
  • openssh AlmaLinux 9 9.9p1-11.el9_8.alma.1
  • openssh-keycat AlmaLinux 9 9.9p1-11.el9_8.alma.1

almalinux advisories ALSA-2026:69129ALSA-2026:69130ALSA-2026:69266

  • openssh Rocky Linux 9 9.9p1-11.el9_8.rocky.0.1
  • openssh Rocky Linux 10 9.9p1-27.el10_2.rocky.0.1
  • openssh Rocky Linux 8 8.0p1-33.el8_10

rocky linux advisories RLSA-2026:69130RLSA-2026:69129RLSA-2026:69266

  • openssh Alpine 3.24 10.3_p1-r1

alpine advisories ALPINE-CVE-2026-73282

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openssh Azure Linux 3.0 9.8p1-10

azure linux advisories AZL-95538

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Is CVE-2026-73282 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-73282 updated cvss 5.6

openssh: OpenSSH: Information disclosure and data corruption via use-after-free in ssh client

  • Red Hat Enterprise Linux 6 openssh, openssh-ldap, openssh-server, openssh-askpass, openssh-clients, pam_ssh_agent_auth Red Hat Enterprise Linux 7 openssh, openssh-cavs, openssh-ldap, openssh-keycat, openssh-server, openssh-askpass, +3 more Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: workaround, no fix available “Avoid issuing dynamic remote-forwarding commands over active SSH multiplexing connections, or disable socket multiplexing by setting ControlMaster no in ~/.ssh/config.”
  • Red Hat Enterprise Linux AppStream (v. 8) openssh-askpass 8.0p1-33.el8_10
    fixed: vendor fix “Avoid issuing dynamic remote-forwarding commands over active SSH multiplexing connections, or disable socket multiplexing by setting ControlMaster no in ~/.ssh/config.” RHSA-2026:69266
  • Red Hat Enterprise Linux AppStream (v. 9) openssh-askpass 9.9p1-11.el9_8, pam_ssh_agent_auth 0.10.4-8.11.el9_8
    fixed: vendor fix “Avoid issuing dynamic remote-forwarding commands over active SSH multiplexing connections, or disable socket multiplexing by setting ControlMaster no in ~/.ssh/config.” RHSA-2026:69130
  • Red Hat Enterprise Linux AppStream (v. 10) openssh-askpass 9.9p1-27.el10_2, openssh-keysign 9.9p1-27.el10_2
    fixed: vendor fix “Avoid issuing dynamic remote-forwarding commands over active SSH multiplexing connections, or disable socket multiplexing by setting ControlMaster no in ~/.ssh/config.” RHSA-2026:69129
  • Red Hat Enterprise Linux BaseOS (v. 8) openssh 8.0p1-33.el8_10, openssh-cavs 8.0p1-33.el8_10, openssh-ldap 8.0p1-33.el8_10, openssh-keycat 8.0p1-33.el8_10, openssh-server 8.0p1-33.el8_10, openssh-clients 8.0p1-33.el8_10, +1 more
    fixed: vendor fix “Avoid issuing dynamic remote-forwarding commands over active SSH multiplexing connections, or disable socket multiplexing by setting ControlMaster no in ~/.ssh/config.” RHSA-2026:69266
  • Red Hat Enterprise Linux BaseOS (v. 9) openssh 9.9p1-11.el9_8, openssh-keycat 9.9p1-11.el9_8, openssh-server 9.9p1-11.el9_8, openssh-clients 9.9p1-11.el9_8
    fixed: vendor fix “Avoid issuing dynamic remote-forwarding commands over active SSH multiplexing connections, or disable socket multiplexing by setting ControlMaster no in ~/.ssh/config.” RHSA-2026:69130
  • Red Hat Enterprise Linux BaseOS (v. 10) openssh 9.9p1-27.el10_2, openssh-keycat 9.9p1-27.el10_2, openssh-server 9.9p1-27.el10_2, openssh-clients 9.9p1-27.el10_2
    fixed: vendor fix “Avoid issuing dynamic remote-forwarding commands over active SSH multiplexing connections, or disable socket multiplexing by setting ControlMaster no in ~/.ssh/config.” RHSA-2026:69129
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) openssh 9.9p1-7.el10_0.5, openssh-clients 9.9p1-7.el10_0.5
    fixed: vendor fix “Avoid issuing dynamic remote-forwarding commands over active SSH multiplexing connections, or disable socket multiplexing by setting ControlMaster no in ~/.ssh/config.” RHSA-2026:76748
show 3 more
  • Red Hat Hardened Images openssh 10.5p1-1.hum1, openssh-keycat 10.5p1-1.hum1, openssh-server 10.5p1-1.hum1, openssh-askpass 10.5p1-1.hum1, openssh-clients 10.5p1-1.hum1, openssh-keysign 10.5p1-1.hum1, +1 more
    fixed: vendor fix “Avoid issuing dynamic remote-forwarding commands over active SSH multiplexing connections, or disable socket multiplexing by setting ControlMaster no in ~/.ssh/config.” RHSA-2026:70719
  • Red Hat Update Infrastructure 5 rhui5/rhua-rhel9 1790242004, rhui5/installer-rhel9 1790241922
    fixed: vendor fix “Avoid issuing dynamic remote-forwarding commands over active SSH multiplexing connections, or disable socket multiplexing by setting ControlMaster no in ~/.ssh/config.” RHSA-2026:71603
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) openssh-askpass 9.9p1-7.el10_0.5, openssh-keysign 9.9p1-7.el10_0.5 Red Hat Enterprise Linux BaseOS EUS (v. 10.0) openssh 9.9p1-7.el10_0.5, openssh-keycat 9.9p1-7.el10_0.5, openssh-server 9.9p1-7.el10_0.5 Red Hat Update Infrastructure 5 rhui5/cds-rhel9 1790241954, rhui5/haproxy-rhel9 1790241900, rhui5/cds-kubernetes-rhel9 1790241897
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2mo ago

Exploit prediction

0.16% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
OSV 3.1 4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
julia OpenSSH_jll
<10.5.1+0
10.5.1+0

Affected products

  • OpenBSD OpenSSH

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.