CVE-2026-59845: libssh
CVSS: 5.9v3.1MediumModified
AliasesUBUNTU-CVE-2026-59845DEBIAN-CVE-2026-59845CGA-2mh5-7jc8-j8c3CGA-9w5q-w5qm-7p6xCGA-gvwm-3f33-4wrjCGA-h458-3f59-qmpjCGA-mpxf-cwp5-q886CGA-v294-4vj7-fj4f
Published 21-07-2026Last modified 01-09-2026
Vulnerability summary
CVE-2026-59845 is a medium (CVSS 5.9) vulnerability in libssh. EPSS estimates a 0.10% chance of exploitation in the next 30 days, higher than 0.9% of scored vulnerabilities.
CVSS score
5.9/10
010
Medium · v3.1 (NVD)EPSS score
0.10%
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 16 · Related 12MGASA-2026-0425OPENSUSE-SU-2026:11377-1OPENSUSE-SU-2026:21444-1RHSA-2026:42922RHSA-2026:55855RHSA-2026:62217RHSA-2026:62218SUSE-SU-2026:22940-1SUSE-SU-2026:22948-1SUSE-SU-2026:22956-1SUSE-SU-2026:23056-1SUSE-SU-2026:23168-1SUSE-SU-2026:3302-1SUSE-SU-2026:3330-1SUSE-SU-2026:3463-1USN-8699-1CGA-J55W-WH3Q-GV9G
Timeline
- 21-07-2026PublishedVulnerability first disclosed.
- 01-09-2026Last modifiedVulnerability information updated.
Description
A flaw was found in libssh. When ProxyCommand is used, an unchecked fork() failure can be stored as process ID -1; during cleanup, signals may then be sent across the caller's accessible process tree, leading to local denial of service.
CVSS metrics
4 scores · 4 sources · 1 versionMedium 5.9Preferred score · NVD (NIST)
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:HSources4 sources · 5.3–5.9
- CVE.orgCNA5.3MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:N/I:N/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:H
EPSS trend
Probability
0.10%
Chance of exploitation in the next 30 days
Percentile
1%
Versus all other CVEs
30-day change
0.00 pp
From 0.10% on 19-09-2026
19-09-202619-10-2026
EPSS score0.10%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Chainguard3 products
- libssh< 0.12.1-r0
- libssh-dev< 0.12.1-r0
- libssh2All versions (No fix recorded)
Wolfi3 products
- libssh< 0.12.1-r0
- libssh-dev< 0.12.1-r0
- libssh2All versions (No fix recorded)
Redhat2 products
- enterprise_linux8.0 | 9.0 | 10.0
- hardened_imagesna
Debian1 product
- libsshAll versions (No fix recorded) | < 0.11.5-0+deb13u1 | < 0.12.1-1
Libssh1 product
- libsshna
Ubuntu1 product
- libsshAll versions (No fix recorded) | < 0.9.6-2ubuntu0.22.04.8 | < 0.10.6-2ubuntu0.5 | < 0.11.3-1ubuntu2.1
6 vendors · 11 products
