CVE-2026-48850: Putty

Medium severity, CVSS 5.9. EPSS: 0.4% chance of exploitation in the next 30 days.

PuTTY 0.72 before 0.84 has a double free in RSA KEX.

Affected products

• Putty Putty: from 0.72, before 0.84 (fixed in 0.84)

Published 2026-05-25. Last modified 2026-07-24.