CVE-2026-48852

PuTTY and 1 other: Reachable Assertion

CVE-2026-48852 is fixed in 5 products on 2 platforms, first by PuTTY CAC 0.84.0.0, released May 25, 2026. It is not reported as exploited. Patch Radar priority: Routine.

RoutineFixed on 2 platforms

CVSS

3.7

low

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0028

19th percentile

PuTTY 0.71 before 0.84 has an assertion failure in ECDSA signature verification.

Where it's fixed

Product	Fixed in	Fix	Released
Windows apps
PuTTY	0.85.0.0	PuTTY 0.85.0.0	Aug 14, 2026
PuTTY CAC	0.84.0.0	PuTTY CAC 0.84.0.0	May 25, 2026
Linux
putty · Debian 14	0.84-1	DEBIAN-CVE-2026-48852	Jun 24, 2026
putty · Fedora 43	0.84-1.fc43	FEDORA-2026-61F53CC218	Jun 1, 2026
putty · opensuse-leap 16.0	0.85-bp160.1.1	OPENSUSE-SU-2026:22127-1	Nov 7, 2026
putty-debuginfo · Fedora 43	0.84-1.fc43	FEDORA-2026-61F53CC218	Jun 1, 2026
putty-debugsource · Fedora 43	0.84-1.fc43	FEDORA-2026-61F53CC218	Jun 1, 2026

Details

Published
May 25, 2026
Weakness
CWE-617: Reachable Assertion
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Vendor advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-48852

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