What’s Vulnerable › Vulnerabilities

CVE-2026-48852

• Severity: low (CVSS 3.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-25 · updated 2026-07-24
• Weakness: CWE-617

Description

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

Affected products

• PuTTY: from 0.71 before 0.84 — fixed in 0.84

How to fix

Upgrade to a fixed version: PuTTY 0.84. Check the vendor advisory for mitigations.

References

• https://lists.tartarus.org/pipermail/putty-announce/2026/000042.html
• https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/ecdsa-remotely-triggerable-assertion.html

Get alerted when CVE-2026-48852 or the next vulnerability affects your stack