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TI-2026-36115 Aliases CVE-2026-48850GHSA-c27j-mcjp-93gg

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

Priority LOW 26CWE-415Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-415 and the CVSS impact.

Summary

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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0032 25th percentileScored 2026-11-07
Fix Fixed PuTTY (PuTTY): 0.84

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
PuTTYPuTTY0.72 to before 0.840.84Patch availableCNA
  • PuTTY VendorPuTTY Affected 0.72 to before 0.84 Fixed in 0.84 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:putty:putty:*:*:*:*:*:*:*:*0.72 to before 0.84VulnerablePuTTY
  • cpe:2.3:a:putty:putty:*:*:*:*:*:*:*:* Versions 0.72 to before 0.84 Vulnerable ·PuTTY

Remediation

  • Fix · CNA PuTTY (PuTTY) Fixed in 0.84

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    PuTTY 0.84

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2026-36117 PuTTY 0.71 before 0.84 has an assertion failure in ECDSA signature verification.Priority LOW 17
    • TI-2026-36116 PuTTY 0.77 before 0.84 uses a copy of the PuTTY icon as a trust indication for TELNET…Priority LOW 15
    Show all 3 records →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-48850
  2. 2026-10-03 Alias added: GHSA-c27j-mcjp-93gg

References

Patch 1

Other 1

  • TI-2002-01283 Multiple SSH2 servers and clients do not properly handle large packets or large fields… CVSS 2.0HIGH 10.0
  • TI-2023-26623 The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6… CVSS 3.1MEDIUM 5.9
  • TI-2017-04321 The ssh_agent_channel_data function in PuTTY before 0.68 allows remote attackers to have… CVSS 3.0CRITICAL 9.8
  • TI-2026-03565 PuTTY Ed25519 Signature ecc-ssh.c eddsa_verify signature verification CVSS 4.0MEDIUM 6.3
  • TI-2002-01281 Multiple SSH2 servers and clients do not properly handle packets or data elements with… CVSS 2.0HIGH 10.0
  • TI-2004-00914 Integer signedness error in the ssh2_rdpkt function in PuTTY before 0.56 allows remote… CVSS 2.0HIGH 10.0
See all 35 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences