CVE-2026-3633

Libsoup: libsoup: header and http request injection via crlf injection

CVE-2026-3633 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.

Routine

CVSS

3.9

Low

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0027

19th percentile

CVE-2026-3632 CVE-2026-3634 libsoup3: various flaws

Where it's fixed

Product	Fixed in	Fix	Released
Linux
libsoup3 · Fedora 43	3.6.6-6.fc43	FEDORA-2026-6C3A4775A6	Nov 13, 2026
libsoup3-debuginfo · Fedora 43	3.6.6-6.fc43	FEDORA-2026-6C3A4775A6	Nov 13, 2026
libsoup3-debugsource · Fedora 43	3.6.6-6.fc43	FEDORA-2026-6C3A4775A6	Nov 13, 2026
libsoup3-devel · Fedora 43	3.6.6-6.fc43	FEDORA-2026-6C3A4775A6	Nov 13, 2026
libsoup3-doc · Fedora 43	3.6.6-6.fc43	FEDORA-2026-6C3A4775A6	Nov 13, 2026
mingw32-libsoup3 · Fedora 43	3.6.6-6.fc43	FEDORA-2026-6C3A4775A6	Nov 13, 2026
mingw32-libsoup3-debuginfo · Fedora 43	3.6.6-6.fc43	FEDORA-2026-6C3A4775A6	Nov 13, 2026
mingw64-libsoup3 · Fedora 43	3.6.6-6.fc43	FEDORA-2026-6C3A4775A6	Nov 13, 2026
mingw64-libsoup3-debuginfo · Fedora 43	3.6.6-6.fc43	FEDORA-2026-6C3A4775A6	Nov 13, 2026

Details

Published
March 21, 2026
Weakness
Improper Neutralization of CRLF Sequences ('CRLF Injection')
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-3633

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