What is CVE-2026-48851?

CVE-2026-48851 is a low-severity vulnerability in Putty, classified under User Interface (UI) Misrepresentation of Critical Information. CVSS score: 3.1/10. Published 2026-05-25.

How severe is CVE-2026-48851?

Low severity. CVSS v3 base score is 3.1 out of 10.

Vulnerability in Putty

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.

EPSS: 0.000 (10.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N.

Affected products

Putty — versions 0.77

Weakness classification (CWE)

CWE-451 — User Interface (UI) Misrepresentation of Critical Information

References

cve@mitre.org (Release Notes)
cve@mitre.org (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-48851?: CVE-2026-48851 is a low-severity vulnerability in Putty, classified under User Interface (UI) Misrepresentation of Critical Information. CVSS score: 3.1/10. Published 2026-05-25.
How severe is CVE-2026-48851?: Low severity. CVSS v3 base score is 3.1 out of 10.