CVE-2026-59843
ADVISORY - debianSummary
A flaw was found in libssh. A remote authenticated peer can advertise a zero maximum packet size in SSH_MSG_CHANNEL_OPEN, causing later channel writes to loop indefinitely and consume CPU, leading to denial of service.
- libssh 0.12.2-1 https://www.libssh.org/2026/07/28/libssh-0-12-2-security-release/ https://www.libssh.org/security/advisories/CVE-2026-59843.txt Fixed by: https://git.libssh.org/projects/libssh.git/commit/?id=3f785905760d2e2a87037285ab85b37b9924e409 (libssh-0.12.2) Fixed by: https://git.libssh.org/projects/libssh.git/commit/?id=006ddd503566ee13e00db42bc111e898388f8664 (libssh-0.12.2)
EPSS Score: 0.00506 (0.404)
Common Weakness Enumeration (CWE)
Debian
CREATED
UPDATED
ADVISORY IDCVE-2026-59843
EXPLOITABILITY SCORE
-
EXPLOITS FOUND
-
COMMON WEAKNESS ENUMERATION (CWE)-
| Package | Type | OS Name | OS Version | Affected Ranges | Fix Versions |
|---|---|---|---|---|---|
| debian/libssh | deb | debian | 14 | <0.12.2-1 | 0.12.2-1 |
| debian/libssh | deb | debian | 11 | >0 | Not yet available |
| debian/libssh | deb | debian | 13 | <0.11.5-0+deb13u1 | 0.11.5-0+deb13u1 |
| debian/libssh | deb | debian | unstable | <0.12.2-1 | 0.12.2-1 |
| debian/libssh | deb | debian | 12 | >0 | Not yet available |
Severity and metrics
No CVSS data available from this advisory.
Alpine
CREATED
UPDATED
ADVISORY IDCVE-2026-59843
EXPLOITABILITY SCORE
-
EXPLOITS FOUND
-
COMMON WEAKNESS ENUMERATION (CWE)-
Ubuntu
CREATED
UPDATED
ADVISORY IDCVE-2026-59843
EXPLOITABILITY SCORE
-
EXPLOITS FOUND
-
COMMON WEAKNESS ENUMERATION (CWE)-
CVSS SCORE
N/AmediumRed Hat
CREATED
UPDATED
ADVISORY IDCVE-2026-59843
EXPLOITABILITY SCORE
2.8
EXPLOITS FOUND
-
COMMON WEAKNESS ENUMERATION (CWE)-