CVE-2026-48851

low

Published 2026-05-25 · Modified 2026-05-27

CVSS v3

3.1

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

CVSS v2

—

VIR risk

3.1

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.

Predictions

Exploit likelihood

42%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2026-48851

vendor Authored 2026-05-27

Vendor advisory: cve@mitre.org — https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/telnet-trust-sigil.html

vendor Authored 2026-05-27

Vendor advisory: cve@mitre.org — https://lists.tartarus.org/pipermail/putty-announce/2026/000042.html

OS impact

OS	Version	Status	Fixed in
debian	bookworm	affected
debian	bullseye	affected
debian	forky	affected
debian	sid	fixed	`0.84-1`
debian	trixie	affected

Application impact

Vendor	Product	Versions	Fixed
putty	putty	`{"startIncluding":"0.77","endExcluding":"0.84"}`	`0.84`

References

CWEs

CWE-451

Verify integrity in audit chain (admin only). AS-IS.