# CVE-2025-34457: direwolf: wb2osz/direwolf (Dire Wolf) versions up to and including 1.8.1, prior to commit 694c954, contain a stack-based buffer...

CVE-2025-34457 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2025-34457, released December 22, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-34457
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0051
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 22, 2025

## Description

wb2osz/direwolf (Dire Wolf) versions up to and including 1.8.1, prior to commit 694c954, contain a stack-based buffer overflow vulnerability in the function kiss_rec_byte() located in src/kiss_frame.c. When processing crafted KISS frames that reach the maximum allowed frame length (MAX_KISS_LEN), the function appends a terminating FEND byte without reserving sufficient space in the stack buffer. This results in an out-of-bounds write followed by an out-of-bounds read during the subsequent call to kiss_unwrap(), leading to stack memory corruption or application crashes. This vulnerability may allow remote unauthenticated attackers to trigger a denial-of-service condition.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | direwolf Debian 13.5 (trixie) | 1.7+dfsg-2+deb13u1 | [DEBIAN-CVE-2025-34457](https://patchblox.com/security/data/fix/linux/debian-cve-2025-34457.md) | Dec 22, 2025 |
| Linux | direwolf Debian 14 | 1.8.1+dfsg-2 | [DEBIAN-CVE-2025-34457](https://patchblox.com/security/data/fix/linux/debian-cve-2025-34457.md) | Dec 22, 2025 |
| Linux | direwolf Fedora 43 | 1.8.1-1.fc43 | [FEDORA-2025-793E1E1341](https://patchblox.com/security/data/fix/linux/fedora-2025-793e1e1341.md) | Dec 24, 2025 |
| Linux | direwolf-debuginfo Fedora 43 | 1.8.1-1.fc43 | [FEDORA-2025-793E1E1341](https://patchblox.com/security/data/fix/linux/fedora-2025-793e1e1341.md) | Dec 24, 2025 |
| Linux | direwolf-debugsource Fedora 43 | 1.8.1-1.fc43 | [FEDORA-2025-793E1E1341](https://patchblox.com/security/data/fix/linux/fedora-2025-793e1e1341.md) | Dec 24, 2025 |
| Linux | direwolf-doc Fedora 43 | 1.8.1-1.fc43 | [FEDORA-2025-793E1E1341](https://patchblox.com/security/data/fix/linux/fedora-2025-793e1e1341.md) | Dec 24, 2025 |

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Data as of 2026-11-08T19:12:23Z 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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