Bug#1126876: libsoup3: CVE-2026-1760

[Salvatore Bonaccorso]

Source: libsoup3
Version: 3.6.5-3
Severity: important
Tags: security upstream
Forwarded: https://gitlab.gnome.org/GNOME/libsoup/-/issues/475
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for libsoup3.

Filling mainly for tracking the upstream issue.

CVE-2026-1760[0]:
| A flaw was found in SoupServer. This HTTP request smuggling
| vulnerability occurs because SoupServer improperly handles requests
| that combine Transfer-Encoding: chunked and Connection: keep-alive
| headers. A remote, unauthenticated client can exploit this by
| sending specially crafted requests, causing SoupServer to fail to
| close the connection as required by RFC 9112. This allows the
| attacker to smuggle additional requests over the persistent
| connection, leading to unintended request processing and potential
| denial-of-service (DoS) conditions.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-1760
    https://www.cve.org/CVERecord?id=CVE-2026-1760
[1] https://gitlab.gnome.org/GNOME/libsoup/-/issues/475
[2] https://gitlab.gnome.org/GNOME/libsoup/-/commit/6224df5a471e9040a99dd3dc2e91817a701b1bf6

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore