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Description

A flaw was found in libsoup, a library used by applications to send network requests. This vulnerability occurs because libsoup does not properly validate hostnames, allowing special characters to be injected into HTTP headers. A remote attacker could exploit this to perform HTTP smuggling, where they can send hidden, malicious requests alongside legitimate ones. In certain situations, this could lead to Server-Side Request Forgery (SSRF), enabling an attacker to force the server to make unauthorized requests to other internal or external systems. The impact is low, as SoupServer is not actually used in internet infrastructure.

Affected products

VendorProductAffectedFixed
Red Hat Red Hat Enterprise Linux 10 — —
Red Hat Red Hat Enterprise Linux 6 — —
Red Hat Red Hat Enterprise Linux 7 — —
Red Hat Red Hat Enterprise Linux 8 — —
Red Hat Red Hat Enterprise Linux 9 — —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 14 libsoup No fix yet —
Debian 13 libsoup3 +1 No fix yet —
Debian 12 libsoup3 +1 No fix yet —
ReleasePackageFixed inAdvisory
Ubuntu 26.10 libsoup3 +1 No fix yet —
Ubuntu 26.04 LTS libsoup3 No fix yet —
Ubuntu 25.10 libsoup3 +1 No fix yet —
Ubuntu 24.04 LTS libsoup3 +1 No fix yet —
Ubuntu 22.04 LTS libsoup2.4 No fix yet —
Show 5 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu Pro 26.04 LTS libsoup2.4 No fix yet —
Ubuntu Pro 22.04 LTS libsoup3 No fix yet —
Ubuntu Pro 20.04 LTS libsoup2.4 No fix yet —
Ubuntu Pro 18.04 LTS libsoup2.4 No fix yet —
Ubuntu Pro 16.04 LTS libsoup2.4 No fix yet —

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 3 libsoup No fix yet —

Advisories 1

References