Vulnerability · Published May 25, 2026 · Assigned by mitre
CVE-2026-48850
Low 3.7
In plain English
A low-severity double free in PuTTY from PuTTY. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)3.7Low
Exploit odds (30 days)0.3%top 74.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
PuTTY 0.72 before 0.84 has a double free in RSA KEX.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | putty | no fix listed | DEBIAN-CVE-2026-48850 |
| Debian:13 | putty | no fix listed | DEBIAN-CVE-2026-48850 |
| Debian:14 | putty | 0.84-1 | DEBIAN-CVE-2026-48850 |
| Ubuntu:22.04:LTS | putty | no fix listed | UBUNTU-CVE-2026-48850 |
| Ubuntu:24.04:LTS | putty | no fix listed | UBUNTU-CVE-2026-48850 |
| Ubuntu:25.10 | putty | no fix listed | UBUNTU-CVE-2026-48850 |
| Ubuntu:26.04:LTS | putty | no fix listed | UBUNTU-CVE-2026-48850 |
| Ubuntu:26.10 | putty | no fix listed | UBUNTU-CVE-2026-48850 |
Affected products (as reported)
Weakness: CWE-415 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L