CVE-2026-2708

A request smuggling vulnerability exists in libsoup's HTTP/1 header parsing logic. The soup_message_headers_append_common() function in libsoup/soup-message-headers.c unconditionally appends each header value without validating for duplicate or conflicting Content-Length fields. This allows an attacker to send HTTP requests containing multiple Content-Length headers with differing values.

CVSS 3.1

5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 24% of CVEs (scores of 2026-10-26)

CWE

CWE-444

Published

2026-04-23

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

Affected

• gnome:libsoup
• redhat:enterprise_linux

References

• https://access.redhat.com/security/cve/CVE-2026-2708
• https://bugzilla.redhat.com/show_bug.cgi?id=2440743
• https://gitlab.gnome.org/GNOME/libsoup/-/issues/500
• https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/513

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