What’s Vulnerable › Vulnerabilities

CVE-2026-12548: Libsoup: heap out-of-bounds read in libsoup due to integer truncation

• Severity: medium (CVSS 4.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-07-21 · updated 2026-10-24
• Weakness: CWE-125

Description

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.

Affected products

• GNOME libsoup: all versions
• Red Hat Enterprise Linux: 10.0

References

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

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