# CVE-2026-6521: wireshark: OpenFlow v5 protocol dissector infinite loops in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service

CVE-2026-6521 is fixed in 5 products on 1 platform, first by DEBIAN-CVE-2026-6521, released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-6521
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0014
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 30, 2026

## Description

OpenFlow v5 protocol dissector infinite loops in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | wireshark Debian 13.5 (trixie) | 4.4.15-0+deb13u1 | [DEBIAN-CVE-2026-6521](https://patchblox.com/security/data/fix/linux/debian-cve-2026-6521.md) | May 15, 2026 |
| Linux | wireshark Debian 14 | 4.6.5-1 | [DEBIAN-CVE-2026-6521](https://patchblox.com/security/data/fix/linux/debian-cve-2026-6521.md) | May 15, 2026 |
| Linux | wireshark sles 15.7 | 4.6.7-150700.21.11.1 | [SUSE-SU-2026:3501-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3501-1.md) | Aug 5, 2026 |
| Linux | wireshark-cli amzn 2023 | 1:4.6.6-1.amzn2023.0.1 | [ALAS2023-2026-1904](https://patchblox.com/security/data/fix/linux/alas2023-2026-1904.md) | Jul 6, 2026 |
| Linux | wireshark-cli-debuginfo amzn 2023 | 1:4.6.6-1.amzn2023.0.1 | [ALAS2023-2026-1904](https://patchblox.com/security/data/fix/linux/alas2023-2026-1904.md) | Jul 6, 2026 |
| Linux | wireshark-debugsource amzn 2023 | 1:4.6.6-1.amzn2023.0.1 | [ALAS2023-2026-1904](https://patchblox.com/security/data/fix/linux/alas2023-2026-1904.md) | Jul 6, 2026 |
| Linux | wireshark-devel amzn 2023 | 1:4.6.6-1.amzn2023.0.1 | [ALAS2023-2026-1904](https://patchblox.com/security/data/fix/linux/alas2023-2026-1904.md) | Jul 6, 2026 |

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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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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