Answer in brief
CVE-2026-59849 records a Low severity (CVSS 3.1) vulnerability in Libssh: libssh: denial of service via automatic certificate authentication loop. The current sources do not mark it as known exploited. Affected software not mapped in the current feed; confirm the named product and version against your inventory.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 3.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
Affected software not mapped in the current feed; confirm the named product and version against your inventory.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:libssh:libssh:0.12.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:redhat:hardened_images:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:arm64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:x64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux:10.2:*:*:*:*:*:arm64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux:10.2:*:*:*:*:*:x64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_els:10.2:*:*:*:*:*:arm64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_els:10.2:*:*:*:*:*:x64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_eus:10.2:*:*:*:*:*:arm64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_eus:10.2:*:*:*:*:*:x64:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:10.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:10.2:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_els:10.2:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:10.2:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:10.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:10.2:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_els:10.2:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:10.2:*:*:*:*:*:*:* | Not reported | Not reported |
Published upstream
Jul 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 19, 2026
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.
Quoted source text, attributed separately from HOL analysis.