CVE-2026-48850
PuTTY and 1 other: Double Free
CVE-2026-48850 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
5.9
medium
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0032
25th percentile
PuTTY 0.72 before 0.84 has a double free in RSA KEX.
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-2026-48850 | 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 |
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