5.9

CVE-2026-48850: putty Double Free

Analyzed
AliasesUBUNTU-CVE-2026-48850DEBIAN-CVE-2026-48850
Published 25-05-2026Last modified 26-05-2026

Vulnerability summary

CVE-2026-48850 is a medium (CVSS 5.9) Double Free vulnerability in putty. EPSS estimates a 0.32% chance of exploitation in the next 30 days, higher than 25.1% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 3.7, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.9/10
010
Medium · v3.1 (NVD)
EPSS score
0.32%
0%100%
Low · -0.09 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
OPENSUSE-SU-2026:12168-1OPENSUSE-SU-2026:22127-1

Timeline

  1. 25-05-2026
    PublishedVulnerability first disclosed.
  2. 26-05-2026
    Last modifiedVulnerability information updated.

Description

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

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.32%

Chance of exploitation in the next 30 days

Percentile

25%

Versus all other CVEs

30-day change

Decrease -0.09 pp

From 0.41% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Debian1 product
  • puttyAll versions (No fix recorded) | < 0.84-1
Putty1 product
Ubuntu1 product
  • puttyAll versions (No fix recorded)

3 vendors · 3 products

References

5 links