Is CVE-2026-4115 actively exploited?

No active exploitation of CVE-2026-4115 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-4115 be exploited remotely?

Yes. CVE-2026-4115 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-4115?

CVE-2026-4115 has a CVSS score of 3.7 (LOW).

HOME VULNERABILITIESCVE-2026-4115

LOW

CVE-2026-4115

CWE-345Published: March 22, 2026· Updated: Mar 23, 2026

3.7

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:1.4th

Official Description

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, responded in a very professional manner and quickly released a patch for the affected product. However, at the moment there is no proof that this flaw might have any real-world impact.

NVD Source

Technical Analysis

CVE-2026-4115 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.