CVE-2026-59999: openbsd openssh Use of Less Trusted Source
CVSS: 7.5v3.1HighAnalyzed
AliasesALPINE-CVE-2026-59999UBUNTU-CVE-2026-59999DEBIAN-CVE-2026-59999
Published 08-07-2026Last modified 08-07-2026
Vulnerability summary
CVE-2026-59999 is a high (CVSS 7.5) Use of Less Trusted Source vulnerability in openbsd openssh. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 4.6% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
0.16%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 12 · Related 5Timeline
- 08-07-2026PublishedVulnerability first disclosed.
- 08-07-2026Last modifiedVulnerability information updated.
Description
In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not.
CVSS metrics
5 scores · 5 sources · 1 versionHigh 7.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:NSources5 sources · 5.9–7.5
- CVE.orgCNA5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:NDiffers
- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS trend
Probability
0.16%
Chance of exploitation in the next 30 days
Percentile
5%
Versus all other CVEs
30-day change
0.00 pp
From 0.16% on 19-09-2026
19-09-202619-10-2026
EPSS score0.16%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu2 products
- opensshAll versions (No fix recorded) | < 1:7.6p1-4ubuntu0.7+esm6 | < 1:8.2p1-4ubuntu0.13+esm3 | < 1:8.9p1-3ubuntu0.16 | < 1:8.9p1-3ubuntu0.16+Fips3 | < 1:9.6p1-3ubuntu13.18 | < 1:9.6p1-3ubuntu13.18+Fips1 | < 1:10.2p1-2ubuntu3.4
- openssh-ssh1All versions (No fix recorded)
Alpine1 product
- openssh< 10.3_p1-r1
Debian1 product
- opensshAll versions (No fix recorded) | < 1:10.4p1-1
Openbsd1 product
- openssh< 10.4
4 vendors · 5 products
References
10 links- marc.info?l=openssh-unix-dev&m=178333966933090&w=2Release Notes
