CVE-2026-48851

Name: CVE-2026-48851
Creator: NVD / NIST
Published: 2026-05-25T21:16:35.4+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 3.1/10EPSS 0.22%

Last modified Jun 17, 2026

CVE-2026-48851 is a low-severity vulnerability rated 3.1/10 on the CVSS scale. PuTTY 0.77 before 0.84 uses a copy of the PuTTY icon as a trust indication for TELNET data but the trust status is not cleared between proxy authentication and the main session.. EPSS estimates a 0.22% chance of exploitation in the next 30 days.

Description

PuTTY 0.77 before 0.84 uses a copy of the PuTTY icon as a trust indication for TELNET data but the trust status is not cleared between proxy authentication and the main session.

Metrics

CVSS 3.1

3.1/10

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

EPSS Probability

0.22%

12.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-451

Affected Software

Vendor	Product	Versions
Putty	Putty	>= 0.77, < 0.84

References

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

Timeline

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

Frequently Asked Questions

What is CVE-2026-48851?

PuTTY 0.77 before 0.84 uses a copy of the PuTTY icon as a trust indication for TELNET data but the trust status is not cleared between proxy authentication and the main session.

How severe is CVE-2026-48851?

CVE-2026-48851 has a CVSS score of 3.1/10 (LOW severity). The EPSS model estimates a 0.22% probability of exploitation in the next 30 days.

How do I fix CVE-2026-48851?

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-2026-48851?

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

Scan your code now

Source: NVD / NIST