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CVE-2026-73282: In ssh in OpenSSH before 10.5, a use-after-free for realloc data can occur if a certain pair of remote-forward

28
Routine
MEDIUM 4.8REMOTEWATCHLISTUPGRADE

CVE-2026-73282 is a medium-severity flaw (CVSS 4.8) affecting openssh. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

  • Remotely exploitable, no login, no user action
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score4.8 (Medium)
Attack vectorNetwork (remote)
Attack complexityHigh
Privileges neededNone
User interactionNone
EPSS exploit chance0.2% (top 95%)
CISA exploited listNo
WeaknessCWE-416
Published2026-08-11
Last modified2026-10-23
Publisher (CNA): MITRE · Vendor: openbsd

Am I affected?

Timeline

openbsd openssh UPGRADE
Affected: < 10.5
Fixed in: 10.5
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy openssh || rpm -q openssh || openssh --version
2. UPGRADE to 10.5 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade openssh
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade openssh
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Related CVEs

References

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