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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.

Published: May 25, 2026Updated: May 26, 2026 Sources: CVE List
NVD MITRE
3.1CVSS
LOW

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 Score
0.0%
Top 91.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:HPR:NUI:RS:UC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None

Weaknesses

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

Affected Products

PuTTY
PuTTY

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://lists.tartarus.org/pipermail/putty-announce/2026/000042.html
lists.tartarus.org
https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/telnet-trust-sigil.html
chiark.greenend.org.uk

Timeline

Published
May 25, 2026
Last Updated
May 26, 2026

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