CVE-2026-12548

MEDIUM 4.2

Libsoup: heap out-of-bounds read in libsoup due to integer truncation

CVSS Score

4.2

EPSS Score

0.0%

EPSS Percentile

0th

A heap out-of-bounds read flaw was found in libsoup. When parsing multipart HTTP messages, an integer type mismatch between the caller and soup_headers_parse() can cause the length parameter to be incorrectly truncated, leading to a heap buffer over-read. A remote attacker could use this flaw to crash an application using libsoup or potentially disclose heap memory contents.

CWE	CWE-125
Vendor	red hat
Product	red hat enterprise linux 10
Published	Jul 21, 2026
Last Updated	Jul 21, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

Low

Affected Versions

Red Hat / Red Hat Enterprise Linux 10

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-12548 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2489996 gitlab.gnome.org: https://gitlab.gnome.org/GNOME/libsoup/-/work_items/512

Credits

Red Hat would like to thank linhlhq (Yes We Hack) for reporting this issue.