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CVE-2026-6324

24
FAUCET Score

A flaw was found in libsoup. A remote attacker could exploit an unsigned to signed conversion error in the `soup_body_input_stream_read_chunked()` function by sending a malicious HTTP request. This vulnerability occurs when libsoup operates behind a non-libsoup proxy server or as a proxy in front of a non-libsoup backend server. Successful exploitation can allow an attacker to bypass security controls, poison web caches, or gain unauthorized access.

First published: May 29, 2026Last modified: May 29, 2026

Impacted Technologies

VendorProductVersion(s)CPE
Red HatRed Hat Enterprise Linux 10
Range not provided by sourceCNA affecteddefault unknown
Red HatRed Hat Enterprise Linux 6
Range not provided by sourceCNA affecteddefault unknown
Red HatRed Hat Enterprise Linux 7
Range not provided by sourceCNA affecteddefault unknown
Red HatRed Hat Enterprise Linux 8
Range not provided by sourceCNA affecteddefault unknown
Red HatRed Hat Enterprise Linux 9
Range not provided by sourceCNA affecteddefault unknown

CVSS Data

CVSS version used by this source: 3.1

4.8MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
2.5
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.87%
Probability of exploitation in next 30 days
EPSS Percentile
55.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0087 is in the 13th percentile among its peer group of 19,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

microsoftpatch availablevia msrc
Product: azl3 libsoup 3.4.4-16 on Azure Linux 3.0Fixed in: 3.4.4-16
microsoftpatch availablevia msrc
Product: azl3 libsoup 3.4.4-15 on Azure Linux 3.0Fixed in: 3.4.4-16
microsoftpatch availablevia msrc
Product: 21202-17084Fixed in: 3.4.4-16
microsoftpatch availablevia msrc
Product: 21478-17084Fixed in: 3.4.4-16

Vendor Advisories (1)

microsoft2026-May/CVE-2026-6324Moderate

Libsoup: libsoup: http request smuggling via unsigned to signed conversion error

May 12, 2026

References

gitlab.gnome.org / GNOME/libsoup/-/work_items/508
access.redhat.com / security/cve/CVE-2026-6324
bugzilla.redhat.com / show_bug.cgi
gitlab.gnome.org / GNOME/libsoup/-/issues/508