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Description

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 Reserved 2026-03-30 | Published 2026-03-30 | Updated 2026-06-03 | Assigner redhat




MEDIUM: 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N

Problem types

Cleartext Transmission of Sensitive Information

Product status

Default status
affected

0:3.6.5-3.el10_1.11 (rpm) before *
unaffected

Default status
affected

0:3.6.5-3.el10_2.11 (rpm) before *
unaffected

Default status
affected

0:3.6.5-3.el10_0.15 (rpm) before *
unaffected

Default status
affected

0:2.62.3-14.el8_10 (rpm) before *
unaffected

Default status
affected

0:2.62.3-14.el8_10 (rpm) before *
unaffected

Default status
affected

0:2.62.3-2.el8_4.9 (rpm) before *
unaffected

Default status
affected

0:2.62.3-2.el8_4.9 (rpm) before *
unaffected

Default status
affected

0:2.62.3-3.el8_8.9 (rpm) before *
unaffected

Default status
affected

0:2.62.3-3.el8_8.9 (rpm) before *
unaffected

Default status
affected

0:2.72.0-12.el9_7.6 (rpm) before *
unaffected

Default status
affected

0:2.72.0-16.el9_8.1 (rpm) before *
unaffected

Default status
affected

0:2.72.0-8.el9_0.10 (rpm) before *
unaffected

Default status
affected

0:2.72.0-8.el9_2.11 (rpm) before *
unaffected

Default status
affected

0:2.72.0-8.el9_4.10 (rpm) before *
unaffected

Default status
affected

0:2.72.0-10.el9_6.7 (rpm) before *
unaffected

Default status
unknown

Default status
affected

Timeline

2026-03-30:Reported to Red Hat.
2026-03-30:Made public.

Credits

Red Hat would like to thank Kona Arctic for reporting this issue.

References

access.redhat.com/errata/RHSA-2026:13978 (RHSA-2026:13978) vendor-advisory

access.redhat.com/errata/RHSA-2026:14087 (RHSA-2026:14087) vendor-advisory

access.redhat.com/errata/RHSA-2026:15968 (RHSA-2026:15968) vendor-advisory

access.redhat.com/errata/RHSA-2026:17482 (RHSA-2026:17482) vendor-advisory

access.redhat.com/errata/RHSA-2026:19143 (RHSA-2026:19143) vendor-advisory

access.redhat.com/errata/RHSA-2026:19356 (RHSA-2026:19356) vendor-advisory

access.redhat.com/errata/RHSA-2026:21686 (RHSA-2026:21686) vendor-advisory

access.redhat.com/errata/RHSA-2026:22316 (RHSA-2026:22316) vendor-advisory

access.redhat.com/errata/RHSA-2026:22317 (RHSA-2026:22317) vendor-advisory

access.redhat.com/errata/RHSA-2026:22323 (RHSA-2026:22323) vendor-advisory

access.redhat.com/errata/RHSA-2026:22710 (RHSA-2026:22710) vendor-advisory

access.redhat.com/errata/RHSA-2026:22716 (RHSA-2026:22716) vendor-advisory

access.redhat.com/security/cve/CVE-2026-5119 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2452932 (RHBZ#2452932) issue-tracking

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

cve.org (CVE-2026-5119)

nvd.nist.gov (CVE-2026-5119)

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