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

Quick assessment

Affected
n/a PuTTY
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PuTTY是Simon Tatham个人开发者的一套免费的Telnet、Rlogin和SSH客户端软件。该软件主要用于对Linux系统进行远程管理。 PuTTY 0.83版本存在数据伪造问题漏洞，该漏洞源于Ed25519签名处理组件中的加密签名验证不当，可能导致远程攻击。

CVSS 3.7 · Low EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
n/a PuTTY 0.83 affected
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I. Basic Information for CVE-2026-4115

Vulnerability Information
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Vulnerability Title
PuTTY Ed25519 Signature ecc-ssh.c eddsa_verify signature verification
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
PuTTY 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PuTTY是Simon Tatham个人开发者的一套免费的Telnet、Rlogin和SSH客户端软件。该软件主要用于对Linux系统进行远程管理。 PuTTY 0.83版本存在数据伪造问题漏洞，该漏洞源于Ed25519签名处理组件中的加密签名验证不当，可能导致远程攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- PuTTY 0.83 cpe:2.3:a:putty:putty:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-4115

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III. Intelligence Information for CVE-2026-4115

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Patches & Fixes for CVE-2026-4115 (1)

Vendor Advisories for CVE-2026-4115 (3)

Proof of Concept for CVE-2026-4115 (2)

Other References for CVE-2026-4115 (1)

Same Patch Batch · n/a · 2026-03-22 · 7 CVEs total

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IV. Related Vulnerabilities

Same product: PuTTY
Same vendor: n/a
Same weakness: CWE-347

V. Comments for CVE-2026-4115

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