# PuTTY vulnerabilities

Source: https://junglewise.ai/threats/technologies/putty  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/putty.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 5 vulnerabilities in PuTTY: 0 in the last 7 days and 0 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-48852, was published on 25 May 2026.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 5 (0 critical, 0 exploited in the wild)

## About PuTTY

PuTTY is a free and open-source terminal emulator, serial console and network file transfer application.

## Latest PuTTY vulnerabilities

- [CVE-2026-48852: PuTTY assertion failure in ECDSA signature verification](https://junglewise.ai/threats/cve-2026-48852-putty-assertion-failure-in-ecdsa-signature-verification) (low, CVSS 3.7, published 25 May 2026)
- [CVE-2026-48851: PuTTY trust sigil spoofing in Telnet and Rlogin sessions](https://junglewise.ai/threats/cve-2026-48851-putty-trust-sigil-spoofing-in-telnet-and-rlogin-sessions) (low, CVSS 3.1, published 25 May 2026)
- [CVE-2026-48850: PuTTY double free in RSA KEX](https://junglewise.ai/threats/cve-2026-48850-putty-double-free-in-rsa-kex) (low, CVSS 3.7, published 25 May 2026)
- [CVE-2026-4115: PuTTY Ed25519 signature malleability in eddsa_verify](https://junglewise.ai/threats/cve-2026-4115-putty-ed25519-signature-malleability-in-eddsa-verify) (low, CVSS 3.7, published 22 Mar 2026)
- [CVE-2023-48795: OpenSSH and others SSH prefix truncation vulnerability (Terrapin)](https://junglewise.ai/threats/cve-2023-48795-openssh-and-others-ssh-prefix-truncation-vulnerability-terrapin) (medium, CVSS 5.9, published 18 Dec 2023)

## Most severe PuTTY vulnerabilities

- [CVE-2023-48795: OpenSSH and others SSH prefix truncation vulnerability (Terrapin)](https://junglewise.ai/threats/cve-2023-48795-openssh-and-others-ssh-prefix-truncation-vulnerability-terrapin) (medium, CVSS 5.9, published 18 Dec 2023)
- [CVE-2026-48852: PuTTY assertion failure in ECDSA signature verification](https://junglewise.ai/threats/cve-2026-48852-putty-assertion-failure-in-ecdsa-signature-verification) (low, CVSS 3.7, published 25 May 2026)
- [CVE-2026-48850: PuTTY double free in RSA KEX](https://junglewise.ai/threats/cve-2026-48850-putty-double-free-in-rsa-kex) (low, CVSS 3.7, published 25 May 2026)
- [CVE-2026-4115: PuTTY Ed25519 signature malleability in eddsa_verify](https://junglewise.ai/threats/cve-2026-4115-putty-ed25519-signature-malleability-in-eddsa-verify) (low, CVSS 3.7, published 22 Mar 2026)
- [CVE-2026-48851: PuTTY trust sigil spoofing in Telnet and Rlogin sessions](https://junglewise.ai/threats/cve-2026-48851-putty-trust-sigil-spoofing-in-telnet-and-rlogin-sessions) (low, CVSS 3.1, published 25 May 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "PuTTY vulnerabilities", https://junglewise.ai/threats/technologies/putty, 9 November 2026.