Medium [CVE-2026-59850] use-after-free via data callbacks on closed channels
This medium-severity Red Hat Linux advisory covers CVE-2026-59850 affecting Red Hat Enterprise Linux 10, Red Hat Hardened Images, Red Hat Enterprise Linux 8.
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Summary
A flaw was found in libssh. If data packets are processed after a channel is closed, channel data callbacks can be invoked after the associated data has already been freed, leading to crashes or possible use-after-free conditions.
Red Hat severity: Moderate — CVSS 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L). Weakness: CWE-416.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Hardened Images; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Red Hat fixing advisory: RHSA-2026:55855, RHSA-2026:42922.
Affected products named by the advisory: Red Hat package: libssh.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
- libssh-0:0.12.0-3.el10_2
- libssh-main-0.12.1-4.hum1
- RHSA-2026:55855
- RHSA-2026:42922
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
Mitigation checklist
- Manually verify the channel is not closed inside your channel data callbacks.
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
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