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Red Hat Enterprise Linux 10 CVE-2026-5119

| EUVDEUVD-2026-17062 MEDIUM
Cleartext Transmission of Sensitive Information (CWE-319)
2026-03-30 redhat
Information Disclosure Red Hat Enterprise Linux 10 Red Hat Enterprise Linux 6 Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 9 Red Hat
5.9
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-319
OWASP Top 10:2025
A04:2025 - Cryptographic Failures
ASVS 5.0
V12 - Secure Communication Transport encryption
Impact

The CVSS 5.9 score reflects moderate risk with high confidentiality impact but limited exploitability constraints: the attack vector is network-based and requires no privileges, but attack complexity is high and user interaction is required, limiting opportunistic exploitation. The EPSS score is not provided in the input data, preventing statistical probability assessment. No KEV status or public exploit code is documented, indicating this is not confirmed in active, widespread exploitation campaigns. However, the real-world risk should not be dismissed due to the moderate CVSS score-the vulnerability directly enables session hijacking, which has high business impact even if exploitation requires network positioning and specific proxy configurations. Organizations using libsoup-dependent applications with HTTP proxy authentication workflows face genuine risk. The presence of user interaction (UI:R) requirement suggests exploitation typically requires the user to initiate HTTPS traffic through a configured proxy, but in enterprise environments with mandatory proxy policies, this may be automatic. Overall, this represents a medium-priority remediation target for affected distributions, particularly those in environments with untrusted networks or proxy infrastructure.
Exploit ScenarioDerived

An attacker positioned on the network between a Linux system and its configured HTTP proxy (e.g., an untrusted Wi-Fi network, compromised ISP router, or malicious corporate proxy) observes HTTPS connection attempts by a user or application. When the client initiates an HTTPS tunnel via HTTP CONNECT, the attacker captures the cleartext HTTP CONNECT request containing the session cookies transmitted by libsoup. The attacker then uses the intercepted cookies to impersonate the user in subsequent HTTP requests to target servers, gaining unauthorized access to the user's sessions. No public exploit code is currently known, but exploitation requires only standard network sniffing tools available to attackers with network access.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 30, 2026

Libsoup transmits sensitive session cookies in cleartext within HTTP CONNECT requests when establishing HTTPS tunnels through configured HTTP proxies, allowing network-positioned attackers or malicious proxies to intercept and hijack user sessions. The vulnerability affects Red Hat Enterprise Linux versions 6 through 10 and carries a CVSS 5.9 score with high confidentiality impact; no public exploit code or confirmed active exploitation has been identified at the time of analysis.

RemediationAI

Apply the security patch released by Red Hat for your specific RHEL version via the package management system (yum or dnf). Consult the Red Hat Security Advisory at https://access.redhat.com/security/cve/CVE-2026-5119 for the exact patched libsoup version applicable to your Red Hat Enterprise Linux release (6, 7, 8, 9, or 10) and install updates with 'yum update libsoup' or 'dnf update libsoup'. As an interim workaround if immediate patching is not possible, avoid configuring HTTP proxies for HTTPS traffic; instead, use HTTPS proxies or direct connections where feasible. For applications requiring HTTP proxy usage, review proxy authentication methods and consider implementing additional session protection mechanisms (e.g., short-lived tokens or IP pinning) until patching is completed. The upstream GNOME project fix is tracked at https://gitlab.gnome.org/GNOME/libsoup/-/issues/502.

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Technical ContextAI · show details

Libsoup is a GNOME HTTP client library used throughout Linux distributions and applications for network communication. The vulnerability stems from improper handling of session cookies during the HTTP CONNECT tunneling protocol (CWE-319: Cleartext Transmission of Sensitive Information), which is used to establish HTTPS connections through HTTP proxies. When a client initiates an HTTPS tunnel, the initial HTTP CONNECT request should not include sensitive authentication headers or cookies; however, libsoup transmits session cookies in this initial cleartext request. An attacker positioned on the network path between the client and proxy, or controlling a malicious HTTP proxy, can observe these cookies before the tunnel is encrypted, enabling session hijacking attacks. The issue affects multiple Red Hat Enterprise Linux versions (6, 7, 8, 9, and 10) via the libsoup package distributed in those distributions.

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Severity by source

NVD PRIMARY 5.9 MEDIUM
AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N
SUSE MEDIUM
Red Hat 5.9 MEDIUM

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

Lifecycle Timeline

2
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
CVE Published
Mar 30, 2026 - 05:35 nvd
MEDIUM 5.9

DescriptionCVE.org

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.

Threat Intelligence Overview

EPSS Score
0.0%
Top 95% exploitable
Data Quality
7 sources
Confidence: High
EUVD NVD CVE.org EPSS Vulnrichment Vendor VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
No
Human Impact· derived
Medium
Technical Impact
Partial

Priority Score

30
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +30
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)CVE.org

cpe:2.3:a:red_hat:red_hat_enterprise_linux_10:*:*:*:*:*:*:*:*
cpe:2.3:a:red_hat:red_hat_enterprise_linux_6:*:*:*:*:*:*:*:*
cpe:2.3:a:red_hat:red_hat_enterprise_linux_7:*:*:*:*:*:*:*:*
cpe:2.3:a:red_hat:red_hat_enterprise_linux_8:*:*:*:*:*:*:*:*
cpe:2.3:a:red_hat:red_hat_enterprise_linux_9:*:*:*:*:*:*:*:*

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Same weakness CWE-319 – Cleartext Transmission of Sensitive Information

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CVE-2025-68613 HIGH POC
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CVE-2017-0147 HIGH POC
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Vendor StatusVendor

Debian

Bug #1132331
libsoup2.4
Release Status Fixed Version Urgency
bullseye vulnerable 2.72.0-2 -
bullseye (security) vulnerable 2.72.0-2+deb11u3 -
bookworm vulnerable 2.74.3-1+deb12u1 -
trixie vulnerable 2.74.3-10.1 -
(unstable) fixed (unfixed) -
libsoup3
Release Status Fixed Version Urgency
bookworm vulnerable 3.2.3-0+deb12u2 -
trixie vulnerable 3.6.5-3 -
forky, sid vulnerable 3.6.6-1 -
(unstable) fixed (unfixed) -

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Micro 5.2 Fixed

References

Advisories & patches
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-5119 ADVISORY https://ubuntu.com/security/notices/USN-8523-1 ADVISORY https://vuldb.com/vuln/354152 REF https://access.redhat.com/errata/RHSA-2026:13978 REF https://access.redhat.com/errata/RHSA-2026:14087 REF https://access.redhat.com/errata/RHSA-2026:15968 REF https://access.redhat.com/errata/RHSA-2026:17482 REF https://access.redhat.com/errata/RHSA-2026:19143 REF https://access.redhat.com/errata/RHSA-2026:19356 REF https://access.redhat.com/errata/RHSA-2026:21686 REF https://access.redhat.com/errata/RHSA-2026:22316 REF https://access.redhat.com/errata/RHSA-2026:22317 REF https://access.redhat.com/errata/RHSA-2026:22323 REF https://access.redhat.com/errata/RHSA-2026:22710 REF https://access.redhat.com/errata/RHSA-2026:22716 REF https://access.redhat.com/errata/RHSA-2026:24344 REF https://access.redhat.com/errata/RHSA-2026:24722 REF https://access.redhat.com/security/cve/CVE-2026-5119 REF https://bugzilla.redhat.com/show_bug.cgi?id=2452932 REF https://gitlab.gnome.org/GNOME/libsoup/-/issues/502

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