CVE-2026-48852: Putty vulnerability

Putty · Putty

PuTTY 0.71 before 0.84 has an assertion failure in ECDSA signature verification.

3.7 CVSS 3.1 Low EPSS 0.35% · top 73.5% CWE-617 · CWE-617

3.7CVSS 3.1 base score

0.35%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

2References

24 Jul 2026Last modified by NVD

Description

PuTTY 0.71 before 0.84 has an assertion failure in ECDSA signature verification.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Putty Putty

References

Link	Tags
https://lists.tartarus.org/pipermail/putty-announce/2026/000042.html	Release Notes
https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/ecdsa-remotely-triggerable-assertion.html	PatchVendor Advisory

Track CVE-2026-48852 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2004-1008Putty vulnerabilityInteger signedness error in the ssh2_rdpkt function in PuTTY before 0.56 allows remote attackers to execute arbitrary code via a SSH2_MSG_DEBUG packe…EPSS 7.4%10 Jan 2005 10.0CVE-2002-1357Cisco ios memory buffer overflow vulnerabilityMultiple SSH2 servers and clients do not properly handle packets or data elements with incorrect length specifiers, which may allow remote attackers …EPSS 9.8%23 Dec 2002 10.0CVE-2002-1358Cisco ios improper input validation vulnerabilityMultiple SSH2 servers and clients do not properly handle lists with empty elements or strings, which may allow remote attackers to cause a denial of …EPSS 5.8%23 Dec 2002 10.0CVE-2002-1359SSH2 implementations mishandle large packets, enabling DoS and possible code executionMultiple SSH2 servers and clients fail to properly handle large packets or large fields, leading to buffer overflow conditions. The flaw was demonstr…EPSS 80%analysed23 Dec 2002 10.0CVE-2002-1360Cisco ios improper input validation vulnerabilityMultiple SSH2 servers and clients do not properly handle strings with null characters in them when the string length is specified by a length field, …EPSS 6.1%23 Dec 2002 9.8CVE-2019-17067Putty allocation without limits vulnerabilityPuTTY before 0.73 on Windows improperly opens port-forwarding listening sockets, which allows attackers to listen on the same port to steal an incomi…EPSS 1.6%1 Oct 2019 9.8CVE-2019-9895Putty memory buffer overflow vulnerabilityIn PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow exists in any kind of server-to-client forwarding.EPSS 2.6%21 Mar 2019 9.8CVE-2019-9898Putty vulnerabilityPotential recycling of random numbers used in cryptography exists within PuTTY before 0.71.EPSS 3.9%21 Mar 2019

Source: NIST National Vulnerability Database (record CVE-2026-48852), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.