CVE-2026-48850
Analyzed Analyzed - Analysis Complete
PuTTY RSA Key Exchange Double Free Vulnerability

Publication date: 2026-05-25

Last updated on: 2026-05-27

Assigner: MITRE

Description
PuTTY 0.72 before 0.84 has a double free in RSA KEX.
CVSS Scores
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Meta Information
Published
2026-05-25
Last Modified
2026-05-27
Generated
2026-06-15
AI Q&A
2026-05-26
EPSS Evaluated
2026-06-14
NVD
CVE-2026-48850
EUVD
EUVD-2026-31729
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
putty putty From 0.72 (inc) to 0.84 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-415 The product calls free() twice on the same memory address.
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Executive Summary

This vulnerability is a double free issue in the RSA key exchange (KEX) component of PuTTY versions 0.72 through 0.83. A double free occurs when a program attempts to free the same memory location twice, which can lead to undefined behavior, including crashes or potential exploitation.

Impact Analysis

The impact of this vulnerability is limited to availability, as indicated by the CVSS score. It can cause a denial of service by crashing the application due to improper memory handling. There is no indication that confidentiality or integrity are affected.

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