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CVE-2026-59843 on CTRL-OS 26.05

Aliases: CVE-2026-59843

Packages: libssh

Status: Plausible

Advisory Information

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.

Updates

2026-07-28 15:51 CEST

Metadata changes:

  • Status for package libssh: “Plausible” (e4af1cf93dd485cb924c1a7f0f0a314be95d6544)

Comment:

This Finding goes back to Plausible since it ended-up not being resolved in the release as previously claimed by upstream.

Upstream libssh states:

we managed to miss one of the fixes for CVE-2026-59843 so this is a fixup release including this missing commit

— https://www.libssh.org/2026/07/28/libssh-0-12-2-security-release/

(Amended on: 2026-07-28 15:52 CEST)

2026-07-22 16:14 CEST

Metadata changes:

  • Status for package libssh: “In Progress” (e4af1cf93dd485cb924c1a7f0f0a314be95d6544)

2026-07-21 16:03 CEST

Metadata changes:

  • Status for package libssh: “Plausible”

2026-07-21 16:03 CEST

Metadata changes:

  • Status for package libssh: “New”