What’s Vulnerable › Vulnerabilities

CVE-2026-48850

• Severity: medium (CVSS 5.9 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-415

Description

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

Affected products

• PuTTY: from 0.72 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/rsakex-double-free.html

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