# CVE-2026-3099: Libsoup: libsoup: authentication bypass via digest authentication replay attack

CVE-2026-3099 is fixed in 9 products on 1 platform, first by FEDORA-2026-6C3A4775A6, released November 13, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-3099
- Priority: Routine
- CVSS: 5.8 (Moderate)
- EPSS: 0.0042
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 31, 2026
- Weakness: Reusing a Nonce, Key Pair in Encryption
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-3099

## Description

libsoup3: Libsoup: Authentication bypass via digest authentication replay attack

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libsoup3 Fedora 43 | 3.6.6-6.fc43 | [FEDORA-2026-6C3A4775A6](https://patchblox.com/security/data/fix/linux/fedora-2026-6c3a4775a6.md) | Nov 13, 2026 |
| Linux | libsoup3-debuginfo Fedora 43 | 3.6.6-6.fc43 | [FEDORA-2026-6C3A4775A6](https://patchblox.com/security/data/fix/linux/fedora-2026-6c3a4775a6.md) | Nov 13, 2026 |
| Linux | libsoup3-debugsource Fedora 43 | 3.6.6-6.fc43 | [FEDORA-2026-6C3A4775A6](https://patchblox.com/security/data/fix/linux/fedora-2026-6c3a4775a6.md) | Nov 13, 2026 |
| Linux | libsoup3-devel Fedora 43 | 3.6.6-6.fc43 | [FEDORA-2026-6C3A4775A6](https://patchblox.com/security/data/fix/linux/fedora-2026-6c3a4775a6.md) | Nov 13, 2026 |
| Linux | libsoup3-doc Fedora 43 | 3.6.6-6.fc43 | [FEDORA-2026-6C3A4775A6](https://patchblox.com/security/data/fix/linux/fedora-2026-6c3a4775a6.md) | Nov 13, 2026 |
| Linux | mingw32-libsoup3 Fedora 43 | 3.6.6-6.fc43 | [FEDORA-2026-6C3A4775A6](https://patchblox.com/security/data/fix/linux/fedora-2026-6c3a4775a6.md) | Nov 13, 2026 |
| Linux | mingw32-libsoup3-debuginfo Fedora 43 | 3.6.6-6.fc43 | [FEDORA-2026-6C3A4775A6](https://patchblox.com/security/data/fix/linux/fedora-2026-6c3a4775a6.md) | Nov 13, 2026 |
| Linux | mingw64-libsoup3 Fedora 43 | 3.6.6-6.fc43 | [FEDORA-2026-6C3A4775A6](https://patchblox.com/security/data/fix/linux/fedora-2026-6c3a4775a6.md) | Nov 13, 2026 |
| Linux | mingw64-libsoup3-debuginfo Fedora 43 | 3.6.6-6.fc43 | [FEDORA-2026-6C3A4775A6](https://patchblox.com/security/data/fix/linux/fedora-2026-6c3a4775a6.md) | Nov 13, 2026 |

---

Data as of 2026-11-13T08:00:37Z 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

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.