CVE-2026-48851

Residual Trust Status Leak in PuTTY Telnet Sessions

Published May 25, 2026 CVSS 3.1 · 3.1 Low EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Residual Trust Status Leak in PuTTY Telnet Sessions
Type Values Removed Values Added
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.
First Time appeared Putty
Putty putty
Weaknesses CWE-451
CPEs cpe:2.3:a:putty:putty:*:*:*:*:*:*:*:*
Vendors & Products Putty
Putty putty
References
Metrics cvssV3_1

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

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
May 26, 2026, 12:40 PM
Reserved
May 25, 2026, 8:16 PM
Status
Analyzed
Published
May 25, 2026, 9:16 PM
Modified
Jul 24, 2026, 10:10 AM