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CVE-2026-4115

3.7 · LOW

A vulnerability was detected in PuTTY 0.83.

Published Mar 22, 2026CWE-345EPSS 0.24%

Overview

CVE-2026-4115 is a low-severity vulnerability. It was published on March 22, 2026 and has a CVSS 3.1 base score of 3.7 (LOW).

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.tartarus.org/?p=simon/putty.git;a=commitdiff;h=af996b5ec27ab79bae3882071b9d6acf16044549GitHubgithub.com/py-thok/putty-ed25519-malleability-s-plus-lGitHubgithub.com/py-thok/putty-ed25519-malleability-s-plus-l/blob/main/poc.pyRefvuldb.com/?ctiid.352429Refvuldb.com/?id.352429Refvuldb.com/?submit.775576Refwww.chiark.greenend.org.uk/~sgtatham/putty/wishlist/eddsa-overlarge-s.htmlRefwww.rfc-editor.org/rfc/rfc8032#section-8.4Refwww.openwall.com/lists/oss-security/2026/05/24/11

How CyberStrike helps

Frequently asked questions

What is CVE-2026-4115?

CVE-2026-4115 is a low-severity vulnerability. It was published on March 22, 2026 and has a CVSS 3.1 base score of 3.7 (LOW).

How severe is CVE-2026-4115?

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-4115?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-4115?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-4115 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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