CVE-2026-4115 PuTTY Ed25519 Signature ecc-ssh.c eddsa_verify signature verification

A vulnerability was detected in PuTTY 0.83. Affected is the function eddsaverify 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 hi...

CVE-2026-4115

PuTTY 0.83 is affected by CVE-2026-4115 in the Ed25519 Signature Handler (eddsa_verify in crypto/ecc-ssh.c). The vulnerability causes improper verification of cryptographic signatures. Exploitation may be performed remotely, but the attack is described as high complexity with low exploitability. ...