CVE-2026-0967: A flaw was found in libssh

Q: How do I fix CVE-2026-0967?

libssh: upgrade to newer than 0.11.3; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2026-0967 being exploited?

CVE-2026-0967 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-0967 affect?

CVE-2026-0967 affects libssh, enterprise linux. Severity is medium (CVSS 5.5). A flaw was found in libssh. A remote attacker, by controlling client configuration files or known_hosts files, could craft specific hostnames that when processed by the `match_pattern()` function can lead to inefficient regular expression b

Q: How urgent is CVE-2026-0967?

Priority 28/100. On your watchlist

Routine

MEDIUM 5.5WATCHLISTUPGRADEMITIGATE

CVE-2026-0967 is a medium-severity flaw (CVSS 5.5) affecting libssh, enterprise linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw was found in libssh. A remote attacker, by controlling client configuration files or known_hosts files, could craft specific hostnames that when processed by the `match_pattern()` function can lead to inefficient regular expression backtracking. This can cause timeouts and resource exhaustion, resulting in a Denial of Service (DoS) for the client.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-1333
Published	2026-03-26
Last modified	2026-09-01

Publisher (CNA): Red Hat, Inc. · Vendor: libssh · redhat

Last updated 2026-09-01 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-26 21:17 UTCPublished CVE record published
2026-09-01 13:18 UTCUpdated Record last modified

libssh libssh UPGRADE

Affected: <= 0.11.3

Fixed in: newer than 0.11.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy libssh || rpm -q libssh || libssh --version

2. UPGRADE to newer than 0.11.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade libssh

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade libssh

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

redhat enterprise linux MITIGATE

Affected: 9.0 · 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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.

Quick answers

How do I fix CVE-2026-0967?

libssh: upgrade to newer than 0.11.3; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-0967 being exploited?

CVE-2026-0967 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-0967 affect?

CVE-2026-0967 affects libssh, enterprise linux. Severity is medium (CVSS 5.5). A flaw was found in libssh. A remote attacker, by controlling client configuration files or known_hosts files, could craft specific hostnames that when processed by the `match_pattern()` function can lead to inefficient regular expression b

How urgent is CVE-2026-0967?

Priority 28/100. On your watchlist

Related CVEs

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CVE-2026-59842 LOW 3.7 DOWNGRADE MITIGATE A flaw was found in libssh
CVE-2026-15370 MEDIUM 6.7 UPGRADE MITIGATE A flaw was found in libssh
CVE-2026-59847 MEDIUM 5.9 UPGRADE MITIGATE A flaw was found in libssh

References

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