How severe is CVE-2026-59999?

CVE-2026-59999 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-59999 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-59999?

CVE-2026-59999 affects Openbsd Openssh. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-59999?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-59999 published?

CVE-2026-59999 was published on 2026-07-08 and last updated on 2026-07-09.

CVE-2026-59999

CVE-2026-59999 is a medium-severity vulnerability in Openbsd Openssh with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-348.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-348
Affected product: Openbsd Openssh
Published: 2026-07-08
Last modified: 2026-07-09

Description

In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not.

Frequently asked questions

What is CVE-2026-59999?: In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not.
How severe is CVE-2026-59999?: CVE-2026-59999 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-59999 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-59999?: CVE-2026-59999 affects Openbsd Openssh. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-59999?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-59999 published?: CVE-2026-59999 was published on 2026-07-08 and last updated on 2026-07-09.

References

Affected products (1)

cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*

More vulnerabilities in Openbsd Openssh

CVE-2003-0786 — Critical (CVSS 10.0): The SSH1 PAM challenge response authentication in OpenSSH 3.7.1 and 3.7.1p1, when Privilege Separation is disabled,…
CVE-2003-0693 — Critical (CVSS 10.0): A "buffer management error" in buffer_append_space of buffer.c for OpenSSH before 3.7 may allow remote attackers to…
CVE-2002-0640 — Critical (CVSS 10.0): Buffer overflow in sshd in OpenSSH 2.3.1 through 3.3 may allow remote attackers to execute arbitrary code via a large…
CVE-2001-0144 — Critical (CVSS 10.0): CORE SDI SSH1 CRC-32 compensation attack detector allows remote attackers to execute arbitrary commands on an SSH…
CVE-2000-0999 — Critical (CVSS 10.0): Format string vulnerabilities in OpenBSD ssh program (and possibly other BSD-based operating systems) allow attackers…
CVE-2000-0525 — Critical (CVSS 10.0): OpenSSH does not properly drop privileges when the UseLogin option is enabled, which allows local users to execute…

All CVEs affecting Openbsd Openssh →

Other CWE-348 vulnerabilities

CVE-2026-48772 — Critical (CVSS 10.0): ProxySQL is a proxy for MySQL and its forks, as well as PostgreSQL. In versions 2.0.0 through 3.0.8, the ProxySQL MySQL…
CVE-2026-58122 — Critical (CVSS 9.1): Hermes WebUI before 0.51.307 contains an authentication bypass vulnerability that allows unauthenticated remote…
CVE-2026-12249 — Critical (CVSS 9.0): An issue was discovered in Canonical ADSys upstream versions through v0.16.2. During Active Directory Certificate…
CVE-2025-69240 — High (CVSS 8.8): Raytha CMS allows an attacker to spoof `X-Forwarded-Host` or `Host` headers to attacker controlled domain. The attacker…
CVE-2025-55292 — High (CVSS 8.2): Meshtastic is an open source mesh networking solution. In the current Meshtastic architecture, a Node is identified by…
CVE-2026-64619 — High (CVSS 7.5): FileCodeBox before 2.4 contains a rate-limit bypass vulnerability in the IPRateLimit class that allows unauthenticated…

Browse all CWE-348 vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

112.124.67.212 (ipv4-addr)
121.43.118.194 (ipv4-addr)
121.41.164.195 (ipv4-addr)
121.40.46.184 (ipv4-addr)
121.40.44.247 (ipv4-addr)
112.124.59.13 (ipv4-addr)
112.124.57.236 (ipv4-addr)
47.99.44.122 (ipv4-addr)