# CVE-2026-3634: Libsoup: libsoup: http header injection and response splitting via crlf injection in content-type header

CVE-2026-3634 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-2026-3634
- Priority: Routine
- CVSS: 3.9 (Low)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 21, 2026
- Weakness: Improper Neutralization of CRLF Sequences ('CRLF Injection')
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-3634

## Description

CVE-2026-3632 CVE-2026-3633 libsoup3: various flaws

## 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 |

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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

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