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Description

A flaw was found in libsoup. A remote attacker could exploit an unsigned to signed conversion error in the `soup_body_input_stream_read_chunked()` function by sending a malicious HTTP request. This vulnerability occurs when libsoup operates behind a non-libsoup proxy server or as a proxy in front of a non-libsoup backend server. Successful exploitation can allow an attacker to bypass security controls, poison web caches, or gain unauthorized access.

PUBLISHED Reserved 2026-04-14 | Published 2026-05-29 | Updated 2026-05-29 | Assigner redhat




MEDIUM: 4.8CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Problem types

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Product status

Default status
unknown

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unknown

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unknown

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unknown

Timeline

2026-04-14:Reported to Red Hat.
2026-01-27:Made public.

References

gitlab.gnome.org/GNOME/libsoup/-/work_items/508 exploit

access.redhat.com/security/cve/CVE-2026-6324 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2458479 (RHBZ#2458479) issue-tracking

gitlab.gnome.org/GNOME/libsoup/-/issues/508

cve.org (CVE-2026-6324)

nvd.nist.gov (CVE-2026-6324)

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