CVE-2026-5119Network attack vector

Session hijacking via cleartext CONNECT cookies

Published Mar 30, 2026 · Updated Mar 30, 2026

Cleartext cookie transmission in libsoup on Red Hat Enterprise Linux allows man-in-the-middle attackers to hijack HTTPS sessions. The soup_session.c tunnel_connect() path attaches session cookies to the unencrypted HTTP CONNECT request before TLS begins. Exposure requires an application configured to tunnel HTTPS through an HTTP proxy; captured cookies enable session hijacking or impersonation.

CVSS severity5.9
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext cookie transmission in libsoup on Red Hat Enterprise Linux allows man-in-the-middle attackers to hijack HTTPS sessions. The soup_session.c tunnel_connect() path attaches session cookies to the unencrypted HTTP CONNECT request before TLS begins. Exposure requires an application configured to tunnel HTTPS through an HTTP proxy; captured cookies enable session hijacking or impersonation.

The record

CVE
CVE-2026-5119
Published
Mar 30, 2026
Updated
Mar 30, 2026
Vendor
389 Directory Server
Product
Red Hat Enterprise Linux 10
Classifications
CWE-319, T1040
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

389 Directory Server · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 7Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

Published CVSS scores

8.2NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
5.9Red HatCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-319Cleartext Transmission of Sensitive Information
T1040Network Sniffing

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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