# CVE-2026-48852: PuTTY and 1 other: Reachable Assertion

CVE-2026-48852 is fixed in 5 products on 2 platforms, first by PuTTY CAC 0.84.0.0, released May 25, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-48852
- Priority: Routine
- CVSS: 3.7 (low)
- EPSS: 0.0028
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 25, 2026
- Weakness: CWE-617: Reachable Assertion
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-48852

## Description

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

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | PuTTY | 0.85.0.0 | [PuTTY 0.85.0.0](https://patchblox.com/security/data/fix/windows-app/putty.putty-0.85.0.0.md) | Aug 14, 2026 |
| Windows apps | PuTTY CAC | 0.84.0.0 | [PuTTY CAC 0.84.0.0](https://patchblox.com/security/data/fix/windows-app/nomorefood.putty-cac-0.84.0.0.md) | May 25, 2026 |
| Linux | putty Debian 14 | 0.84-1 | [DEBIAN-CVE-2026-48852](https://patchblox.com/security/data/fix/linux/debian-cve-2026-48852.md) | Jun 24, 2026 |
| Linux | putty Fedora 43 | 0.84-1.fc43 | [FEDORA-2026-61F53CC218](https://patchblox.com/security/data/fix/linux/fedora-2026-61f53cc218.md) | Jun 1, 2026 |
| Linux | putty opensuse-leap 16.0 | 0.85-bp160.1.1 | [OPENSUSE-SU-2026:22127-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22127-1.md) | Nov 7, 2026 |
| Linux | putty-debuginfo Fedora 43 | 0.84-1.fc43 | [FEDORA-2026-61F53CC218](https://patchblox.com/security/data/fix/linux/fedora-2026-61f53cc218.md) | Jun 1, 2026 |
| Linux | putty-debugsource Fedora 43 | 0.84-1.fc43 | [FEDORA-2026-61F53CC218](https://patchblox.com/security/data/fix/linux/fedora-2026-61f53cc218.md) | Jun 1, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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