Red Hat Enterprise Linux 10: Cleartext Transmission of Sensitive Information
CVE-2026-5119 is a high-severity cleartext transmission of sensitive information vulnerability in Red Hat Enterprise Linux 10 from Red Hat, with a CVSS 3.1 base score of 8.2 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. There is no confirmed exploitation so far. EPSS estimates a 0.26% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of Red Hat Enterprise Linux 10 you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on access.redhat.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- LowLimited modification of data is possible.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 5.9 | Medium | CNA (redhat.com) |
| CVSS 3.1 | 8.2 | High | NVD |
Official 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.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Cleartext Transmission of Sensitive Information
The product transmits sensitive or security-critical data in cleartext in a communication channel that can be sniffed by unauthorized actors.
How developers prevent this class of flaw
- Before transmitting, encrypt the data using reliable, confidentiality-protecting cryptographic protocols.
- When using web applications with SSL, use SSL for the entire session from login to logout, not just for the initial login page.
- When designing hardware platforms, ensure that approved encryption algorithms (such as those recommended by NIST) protect paths from security critical data to trusted user applications.
More Cleartext Transmission of Sensitive Information vulnerabilities (CWE-319)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Advisories
- access.redhat.com/security/cve/CVE-2026-5119Mitigation
- bugzilla.redhat.com/show_bug.cgi?id=2452932Issue Tracking
Technical write-ups (may include proof of concept)
- gitlab.gnome.org/GNOME/libsoup/-/issues/502Exploit, Issue Tracking
Other references
- access.redhat.com/errata/RHSA-2026:13978
- access.redhat.com/errata/RHSA-2026:14087
- access.redhat.com/errata/RHSA-2026:15968
- access.redhat.com/errata/RHSA-2026:17482
- access.redhat.com/errata/RHSA-2026:19143
- access.redhat.com/errata/RHSA-2026:19356
- access.redhat.com/errata/RHSA-2026:21686
- access.redhat.com/errata/RHSA-2026:22316
- access.redhat.com/errata/RHSA-2026:22317
- access.redhat.com/errata/RHSA-2026:22323
- access.redhat.com/errata/RHSA-2026:22710
- access.redhat.com/errata/RHSA-2026:22716
- access.redhat.com/errata/RHSA-2026:24344
- access.redhat.com/errata/RHSA-2026:24722
Other vulnerabilities in Red Hat Enterprise Linux 10
- 8.8 High severity
- 7.5 High severity
- 7.5 High severity
- 7.9 High severity
- 7.3 High severity
- 7.5 High severity
Recent Cleartext Transmission of Sensitive Information vulnerabilities
- 9.1 Critical severity
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 8.3 High severity
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