CVE-2026-48850

Name: CVE-2026-48850
Creator: NVD / NIST
Published: 2026-05-25T21:16:35.267+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.9/10EPSS 0.32%

Last modified Jun 17, 2026

CVE-2026-48850 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. PuTTY 0.72 before 0.84 has a double free in RSA KEX.. EPSS estimates a 0.32% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

5.9/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.32%

23.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-415

Affected Software

Vendor	Product	Versions
Putty	Putty	>= 0.72, < 0.84

References

https://lists.tartarus.org/pipermail/putty-announce/2026/000042.htmlRelease Notes
https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/rsakex-double-free.htmlPatch, Vendor Advisory

Timeline

Published: May 25, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-48850?

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

How severe is CVE-2026-48850?

CVE-2026-48850 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 0.32% probability of exploitation in the next 30 days.

How do I fix CVE-2026-48850?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-48850?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST