ECDSA Signature Verification Failure in PuTTY

Publication date: 2026-05-25

Last updated on: 2026-05-27

Assigner: MITRE

Description

PuTTY 0.71 before 0.84 has an assertion failure in ECDSA signature verification.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-05-25

Last Modified

2026-05-27

Generated

2026-07-06

AI Q&A

2026-05-26

EPSS Evaluated

2026-07-04

NVD

CVE-2026-48852

EUVD

EUVD-2026-31735

Affected Vendors & Products

Vendor	Product	Version / Range
putty	putty	From 0.71 (inc) to 0.84 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-617	The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.

Attack-Flow Graph

Executive Summary

This vulnerability is an assertion failure in the ECDSA signature verification process in PuTTY versions 0.71 through 0.83. An assertion failure typically means that the software encounters an unexpected condition that causes it to stop or behave incorrectly during the verification of ECDSA signatures.

Impact Analysis

The impact of this vulnerability is limited to availability, as indicated by the CVSS score. It could cause PuTTY to crash or become unavailable during ECDSA signature verification, but it does not affect confidentiality or integrity.

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