CVE catalog

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.

[CVE catalog]

Severity: Low · CVSS 3.1CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
Published: May 25, 2026, 8:16:31 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.22% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	putty	sid	`0.85-3`	fixed
Debian	putty	forky	`0.85-3`	fixed
Debian	putty	trixie	`0.83-3`	vulnerable
Debian	putty	bookworm	`0.78-2+deb12u2`	vulnerable
Debian	putty	bookworm-security	`0.78-2+deb12u1`	vulnerable
Cpe	putty	Not reported	Not reported	vulnerable
Cpe	putty	Not reported	`0.84`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	putty	source	sid	`0.84-1`	not yet assigned	Not reported	Not reported
Debian	putty	source	forky	`0.84-1`	not yet assigned	Not reported	Not reported
Debian	putty	source	trixie	`(unfixed)`	not yet assigned	Not reported	Not reported
Debian	putty	source	bookworm	`(unfixed)`	not yet assigned	Not reported	Not reported
Cpe	putty	cpe	Not reported	`0.84`	Not reported	Not reported	Not reported

Notes

[trixie] putty: Minor issue [bookworm] putty: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[pterm]Affected
Source package: [putty]
Details (4)
- 0.78-2+deb12u2 · amd64 · bookworm
  Affected
  nvd · putty · debian · bookworm; nvd · putty · debian · 12
- 0.78-2+deb12u2 · arm64 · bookworm
  Affected
  nvd · putty · debian · bookworm; nvd · putty · debian · 12
- 0.78-2+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · putty · debian · bookworm; nvd · putty · debian · 12
- 0.78-2+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · putty · debian · bookworm; nvd · putty · debian · 12
[putty]Affected
Details (4)
- 0.78-2+deb12u2 · amd64 · bookworm
  Affected
  nvd · putty · debian · bookworm; nvd · putty · debian · 12
- 0.78-2+deb12u2 · arm64 · bookworm
  Affected
  nvd · putty · debian · bookworm; nvd · putty · debian · 12
- 0.78-2+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · putty · debian · bookworm; nvd · putty · debian · 12
- 0.78-2+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · putty · debian · bookworm; nvd · putty · debian · 12
[putty-doc]Affected
Source package: [putty]
Details (4)
- 0.78-2+deb12u2 · all · bookworm
  Affected
  nvd · putty · debian · bookworm; nvd · putty · debian · 12
- 0.78-2+deb12u2 · all · bookworm
  Affected
  nvd · putty · debian · bookworm; nvd · putty · debian · 12
- 0.78-2+deb12u1 · all · bookworm-security
  Affected
  nvd · putty · debian · bookworm; nvd · putty · debian · 12
- 0.78-2+deb12u1 · all · bookworm-security
  Affected
  nvd · putty · debian · bookworm; nvd · putty · debian · 12
[putty-tools]Affected
Source package: [putty]
Details (4)
- 0.78-2+deb12u2 · amd64 · bookworm
  Affected
  nvd · putty · debian · bookworm; nvd · putty · debian · 12
- 0.78-2+deb12u2 · arm64 · bookworm
  Affected
  nvd · putty · debian · bookworm; nvd · putty · debian · 12
- 0.78-2+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · putty · debian · bookworm; nvd · putty · debian · 12
- 0.78-2+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · putty · debian · bookworm; nvd · putty · debian · 12

[Debian 13 (Trixie)]

[pterm]Affected
Source package: [putty]
Details (2)
- 0.83-3 · amd64 · trixie
  Affected
  nvd · putty · debian · 13
- 0.83-3 · arm64 · trixie
  Affected
  nvd · putty · debian · 13
[putty]Affected
Details (2)
- 0.83-3 · amd64 · trixie
  Affected
  nvd · putty · debian · 13
- 0.83-3 · arm64 · trixie
  Affected
  nvd · putty · debian · 13
[putty-doc]Affected
Source package: [putty]
Details (2)
- 0.83-3 · all · trixie
  Affected
  nvd · putty · debian · 13
- 0.83-3 · all · trixie
  Affected
  nvd · putty · debian · 13
[putty-tools]Affected
Source package: [putty]
Details (2)
- 0.83-3 · amd64 · trixie
  Affected
  nvd · putty · debian · 13
- 0.83-3 · arm64 · trixie
  Affected
  nvd · putty · debian · 13

Observed: Oct 23, 2026, 10:02:46 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]