Vulnerability in Putty
CVE-2026-4115
A vulnerability was detected in PuTTY 0.83. Affected is the function eddsa_verify of the file crypto/ecc-ssh.c of the component Ed25519 Signature Handler. The manipulation results in improper verification of cryptographic signature. The at…
EPSS: 0.000 (3.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Putty — versions 0.83
- N/a Putty — versions 0.83
Weakness classification (CWE)
References
- cna@vuldb.com (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- cna@vuldb.com (signature, Permissions Required, permissions-required, VDB Entry)
- cna@vuldb.com (VDB Entry, Third Party Advisory, third-party-advisory)
- cna@vuldb.com (related, Third Party Advisory)
- cna@vuldb.com (related, Third Party Advisory)
- cna@vuldb.com (Exploit, exploit)
- cna@vuldb.com (Permissions Required, patch)
- cna@vuldb.com (Technical Description, related)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2026-4115?
- CVE-2026-4115 is a low-severity vulnerability in Putty, classified under Insufficient Verification of Data Authenticity. CVSS score: 3.7/10. Published 2026-03-22.
- How severe is CVE-2026-4115?
- Low severity. CVSS v3 base score is 3.7 out of 10.