Medium severity6.5NVD Advisory· Published Jul 21, 2026· Updated Sep 1, 2026
CVE-2026-59843
CVE-2026-59843
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
18- cpe:2.3:a:redhat:hardened_images:-:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
- osv-coords11 versionspkg:apk/chainguard/libsshpkg:apk/chainguard/libssh-devpkg:apk/chainguard/libssh2pkg:apk/wolfi/libsshpkg:apk/wolfi/libssh-devpkg:apk/wolfi/libssh2pkg:rpm/almalinux/libsshpkg:rpm/almalinux/libssh-configpkg:rpm/almalinux/libssh-develpkg:rpm/opensuse/libssh&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/libssh&distro=openSUSE%20Tumbleweed
< 0.12.2-r0+ 10 more
- (no CPE)range: < 0.12.2-r0
- (no CPE)range: < 0.12.2-r0
- (no CPE)range: < 0
- (no CPE)range: < 0.12.2-r0
- (no CPE)range: < 0.12.2-r0
- (no CPE)range: < 0
- (no CPE)range: < 0.12.0-3.el10_2
- (no CPE)range: < 0.12.0-3.el10_2
- (no CPE)range: < 0.12.0-3.el10_2
- (no CPE)range: < 0.11.5-160000.1.1
- (no CPE)range: < 0.11.5-1.2
Patches
Vulnerability mechanics
References
6- access.redhat.com/errata/RHSA-2026:42922nvdVendor Advisory
- access.redhat.com/security/cve/CVE-2026-59843nvdVendor Advisory
- bugzilla.redhat.com/show_bug.cginvdIssue TrackingVendor Advisory
- access.redhat.com/errata/RHSA-2026:55855nvd
- access.redhat.com/errata/RHSA-2026:62217nvd
- access.redhat.com/errata/RHSA-2026:62218nvd
News mentions
1- Libssh: Eleven Vulnerabilities Disclosed Together, Including Auth Bypass and DoSVypr Intelligence · Jul 21, 2026