CVE-2026-59849
Last modified
CVE-2026-59849 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 0.19% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Libssh | Libssh | All versions |
| Redhat | Hardened Images | All versions |
| Redhat | Enterprise Linux | 10.0 |
References
- https://access.redhat.com/errata/RHSA-2026:42922Issue Tracking
- https://access.redhat.com/security/cve/CVE-2026-59849Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2498182Issue Tracking, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-59849?
How severe is CVE-2026-59849?
How do I fix CVE-2026-59849?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-59843A flaw was found in libssh. A remote authenticated peer can …6.5
- CVE-2026-59844A flaw was found in libssh. A remote authenticated client ca…6.5
- CVE-2026-59845A flaw was found in libssh. When ProxyCommand is used, an un…5.9
- CVE-2026-59846A flaw was found in libssh. A malicious username expanded th…3.9
- CVE-2026-59847A flaw was found in libssh. Incorrect AES-GCM finalization c…7.5
- CVE-2026-59848A flaw was found in libssh. A malicious SFTP server can send…5.3
- CVE-2026-5985A security flaw has been discovered in code-projects Simple …7.3
- CVE-2026-59850A flaw was found in libssh. If data packets are processed af…7.5
- CVE-2026-59851A flaw was found in libssh. On servers with GSSAPIKeyExchang…8.8
- CVE-2026-59853SiYuan is an open-source personal knowledge management syste…6.5
- CVE-2026-59854SiYuan is an open-source personal knowledge management syste…4.9
- CVE-2026-59855SiYuan is an open-source personal knowledge management syste…8.6
Are you affected by CVE-2026-59849?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST