CVE-2026-5119 | Libsoup: libsoup: information disclosure via cleartext transmission of cookies during https tunnel establishment

Exp

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: 2026-03-30 Last update: 2026-06-09 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-5119 is rated Exploit Available (50/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.02%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2026-5119

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2026-5119

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-30 — 0.02% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-5119

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.9 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 1.6 4.2 [email protected]
8.2 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 4.2 [email protected]

Weakness enumeration for CVE-2026-5119

GitHub Security Advisory for CVE-2026-5119

GHSA-j666-j6hj-fpc7 · Severity: medium — A flaw was found in libsoup. When establishing HTTPS tunnels through a configured HTTP proxy,...

OS Trackers for CVE-2026-5119

vendor priority summary link
debian not yet assigned CVE-2026-5119 not yet assigned priority: Debian including 2 source packages (libsoup2.4, libsoup3), 7 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 7. https://security-tracker.debian.org/tracker/CVE-2026-5119
redhat medium — https://access.redhat.com/security/cve/CVE-2026-5119
suse medium — https://www.suse.com/security/cve/CVE-2026-5119/
ubuntu medium CVE-2026-5119 medium priority: Ubuntu including 2 source packages (libsoup2.4, libsoup3), 11 status rows across 7 suites (bionic, focal, jammy, noble, questing, upstream, xenial): needs-triage 11. https://ubuntu.com/security/CVE-2026-5119

Affected software / configurations for CVE-2026-5119

Vendor Product Version Raw CPE
gnome libsoup — cpe:2.3:a:gnome:libsoup:-:*:*:*:*:*:*:*
redhat enterprise_linux 7.0 cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
redhat enterprise_linux 8.0 cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
redhat enterprise_linux 9.0 cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
redhat enterprise_linux 10.0 cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*

References for CVE-2026-5119

URL Tags
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 Mitigation Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2452932 Issue Tracking Vendor Advisory
https://gitlab.gnome.org/GNOME/libsoup/-/issues/502 Exploit Issue Tracking
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