CVE-2026-48852
PuTTY 0.71 before 0.84 has an assertion failure in ECDSA signature verification.
Published Updated
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putty vulnerabilities
Vulnerabilities published for putty in the last 30 days: 0. Listed in the KEV catalogue: 0.
Vulnerabilities: 6
CVE-2026-48851
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.
Published UpdatedCVE-2026-48850
PuTTY 0.72 before 0.84 has a double free in RSA KEX.
Published UpdatedPuTTY Ed25519 Signature ecc-ssh.c eddsa_verify signature verification
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 level of complexity. The exploitability is told to be difficult. The exploit is now public and may be used. The real existence of this vulnerability is still doubted at the moment. The patch is identified as af996b5ec27ab79bae3882071b9d6acf16044549. It is advisable to implement a patch to correct this issue. The vendor was contacted early, respond
Published UpdatedCVE-2021-33500
PuTTY before 0.75 on Windows allows remote servers to cause a denial of service (Windows GUI hang) by telling the PuTTY window to change its title repeatedly at high speed, which results in many SetWindowTextA or SetWindowTextW calls. NOTE: the same attack methodology may affect some OS-level GUIs on Linux or other platforms for similar reasons.
Published UpdatedCVE-2019-17067
PuTTY before 0.73 on Windows improperly opens port-forwarding listening sockets, which allows attackers to listen on the same port to steal an incoming connection.
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