Putty CVE Vulnerabilities
By Putty — 4 known vulnerabilities
Critical
0
High
0
Medium
0
Low
4
None
0
All Putty CVEs
CVE-2026-48852
3.7
low
PuTTY 0.71 before 0.84 has an assertion failure in ECDSA signature verification.
May 25, 2026
CVE-2026-48851
3.1
low
PuTTY 0.77 before 0.84 uses a copy of the PuTTY icon as a trust indication for TELNET data but the trust status is not cleared between proxy authentication and the main session.
May 25, 2026
CVE-2026-48850
3.7
low
PuTTY 0.72 before 0.84 has a double free in RSA KEX.
May 25, 2026
CVE-2026-4115
3.7
low
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 attack may be performed from remote. The attack requires a high
Mar 22, 2026