Is CVE-2026-48852 in the CISA KEV catalog?

No. CVE-2026-48852 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-48852?

CVE-2026-48852 has a CVSS v3 base score of 3.7 (LOW).

What is the EPSS score for CVE-2026-48852?

CVE-2026-48852 has an EPSS score of 0.27% (19th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-48852?

Upgrade putty on debian unstable to 0.84-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2026-48852

LOW

3.7

CVSS v3

NVD

Description

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

CWE-617

How to fix

Remediation Available

puttyDebian

Fixed in:0.84-1CVE-2026-48852

PuTTYWindows application

Affected:0.71 0.84Fixed in:0.84Simon Tatham

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

0.27%probability of exploitation in 30 days

19thpercentile

Low risk: more likely to be exploited than 19% of all known CVEs.

References

Patch1

chiark.greenend.org.uk

Release Notes1

lists.tartarus.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-27.