PuTTY 0.72 before 0.84 has a double free in RSA KEX.

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
PuTTY PuTTY unaffected
Version Status Constraints
0.72 affected < 0.84

No data.

No data.

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No data.

Project Subscriptions

Vendors Products
Putty Subscribe
Putty Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://lists.tartarus.org/pipermail/putty-announce/2026/000042.html cve-icon
https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/rsakex-double-free.html cve-icon
History

Mon, 25 May 2026 21:45:00 +0000

Type Values Removed Values Added
Title PuTTY RSA Key Exchange Double-Free Vulnerability

Mon, 25 May 2026 20:45:00 +0000

Type Values Removed Values Added
Description PuTTY 0.72 before 0.84 has a double free in RSA KEX.
First Time appeared Putty
Putty putty
Weaknesses CWE-415
CPEs cpe:2.3:a:putty:putty:*:*:*:*:*:*:*:*
Vendors & Products Putty
Putty putty
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-05-25T20:13:58.605Z

Reserved: 2026-05-25T20:13:58.149Z

Link: CVE-2026-48850

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-25T21:30:06Z

Weaknesses