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    CVE-2026-5119

    A flaw was found in libsoup. When establishing HTTPS tunnels through a configured HTTP proxy, sensitive session cookies are transmitted in cleartext within the initial HTTP CONNECT request. A network-positioned attacker or a malicious HTTP proxy can intercept these cookies, leading to potential session hijacking or user impersonation.

    Published:Mar 30, 2026
    Last Modified:Jun 9, 2026
    EPS:Mar 30, 2026
    EPSS Score:0.00016
    CVSS Score:5.9

    Affected Products

    Vendor
    Gnome
    Product
    Libsoup
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Enterprise Linux Eus
    Vendor
    Redhat
    Product
    Rhel Aus
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Els
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Eus Long Life
    Vendor
    Redhat
    Product
    Rhel Tus

    Exploits

    https://gitlab.gnome.org/GNOME/libsoup/-/issues/502

    Related CVEs

    CVE-2026-85534 (CVSS 5.9) — A flaw was found in libsoup. When a client sends an HTTP/2 request body from a non-pollable input stream, the …
    CVE-2026-66337 (CVSS 6.5) — A flaw was found in libsoup. An unsigned integer underflow in the soup_filter_input_stream_read_until() functi…
    CVE-2026-66338 (CVSS 5.4) — A flaw was found in libsoup. The chunked transfer encoding parser uses a permissive parsing function for chunk…
    CVE-2026-66339 (CVSS 6.5) — A flaw was found in libsoup. After a CONNECT tunnel is established through an HTTP proxy, libsoup incorrectly …
    CVE-2026-12548 (CVSS 4.2) — A heap out-of-bounds read flaw was found in libsoup. When parsing multipart HTTP messages, an integer type mis…
    CVE-2026-6324 (CVSS 4.8) — A flaw was found in libsoup. A remote attacker could exploit an unsigned to signed conversion error in the `so…
    CVE-2026-4271 (CVSS 5.3) — A flaw was found in libsoup, a library for handling HTTP requests. This vulnerability, known as a Use-After-Fr…
    CVE-2026-3633 (CVSS 3.9) — A flaw was found in libsoup. A remote attacker, by controlling the method parameter of the `soup_message_new()…
    CVE-2026-3632 (CVSS 3.9) — A flaw was found in libsoup, a library used by applications to send network requests. This vulnerability occur…
    CVE-2026-3634 (CVSS 3.9) — A flaw was found in libsoup. An attacker controlling the value used to set the Content-Type header can inject …

    References

    https://access.redhat.com/errata/RHSA-2026:13978
    https://access.redhat.com/errata/RHSA-2026:14087
    https://access.redhat.com/errata/RHSA-2026:15968
    https://access.redhat.com/errata/RHSA-2026:17482
    https://access.redhat.com/errata/RHSA-2026:19143
    https://access.redhat.com/errata/RHSA-2026:19356
    https://access.redhat.com/errata/RHSA-2026:21686
    https://access.redhat.com/errata/RHSA-2026:22316
    https://access.redhat.com/errata/RHSA-2026:22317
    https://access.redhat.com/errata/RHSA-2026:22323
    https://access.redhat.com/errata/RHSA-2026:22710
    https://access.redhat.com/errata/RHSA-2026:22716
    https://access.redhat.com/errata/RHSA-2026:24344
    https://access.redhat.com/errata/RHSA-2026:24722
    https://access.redhat.com/security/cve/CVE-2026-5119
    https://bugzilla.redhat.com/show_bug.cgi?id=2452932
    https://gitlab.gnome.org/GNOME/libsoup/-/issues/502

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High