CVE-2026-59849
ADVISORY - debianSummary
A flaw was found in libssh. Logic errors in automatic certificate-based public key authentication can cause libssh clients to loop indefinitely when configured certificates are missing or repeatedly rejected by a server, leading to denial of service.
- libssh 0.12.1-1 (bug https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1142537) https://www.libssh.org/2026/07/21/libssh-0-12-1-and-0-11-5-security-releases/ https://www.libssh.org/security/advisories/CVE-2026-59849.txt Fixed by: https://git.libssh.org/projects/libssh.git/commit/?id=d9fef838e27fc740f70d9b825c98b912f3e84b14 (libssh-0.12.1) Fixed by: https://git.libssh.org/projects/libssh.git/commit/?id=2a40a20b4963e033c7c5a21e3dc5ea6572178a20 (libssh-0.12.1) Fixed by: https://git.libssh.org/projects/libssh.git/commit/?id=a540e27659b08828ef61f2910a790f7cf2af9f8d (libssh-0.12.1)
EPSS Score: 0.00236 (0.148)
Common Weakness Enumeration (CWE)
ADVISORY - redhat
Loop with Unreachable Exit Condition ('Infinite Loop')
Debian
CREATED
UPDATED
ADVISORY IDCVE-2026-59849
EXPLOITABILITY SCORE
-
EXPLOITS FOUND
-
COMMON WEAKNESS ENUMERATION (CWE)-
| Package | Type | OS Name | OS Version | Affected Ranges | Fix Versions |
|---|---|---|---|---|---|
| debian/libssh | deb | debian | unstable | <0.12.1-1 | 0.12.1-1 |
| debian/libssh | deb | debian | 14 | <0.12.1-1 | 0.12.1-1 |
| debian/libssh | deb | debian | 11 | >0 | Not yet available |
| debian/libssh | deb | debian | 12 | >0 | Not yet available |
| debian/libssh | deb | debian | 13 | <0.11.5-0+deb13u1 | 0.11.5-0+deb13u1 |
Severity and metrics
No CVSS data available from this advisory.
Alpine
CREATED
UPDATED
ADVISORY IDCVE-2026-59849
EXPLOITABILITY SCORE
-
EXPLOITS FOUND
-
COMMON WEAKNESS ENUMERATION (CWE)-
Ubuntu
CREATED
UPDATED
ADVISORY IDCVE-2026-59849
EXPLOITABILITY SCORE
-
EXPLOITS FOUND
-
COMMON WEAKNESS ENUMERATION (CWE)-
CVSS SCORE
N/AmediumRed Hat
CREATED
UPDATED
ADVISORY IDCVE-2026-59849
EXPLOITABILITY SCORE
1.6
EXPLOITS FOUND
-
COMMON WEAKNESS ENUMERATION (CWE)