CVE-2026-12548
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Heap Out-of-Bounds Read in libsoup HTTP Parser

Publication date: 2026-07-21

Last updated on: 2026-07-21

Assigner: Red Hat, Inc.

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.

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Meta Information

Published
2026-07-21
Last Modified
2026-07-21
Generated
2026-07-22
AI Q&A
2026-07-21
EPSS Evaluated
N/A
NVD
CVE-2026-12548
EUVD
EUVD-2026-46363

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
gnome libsoup *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-125 The product reads data past the end, or before the beginning, of the intended buffer.

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Executive Summary

CVE-2026-12548 is a heap out-of-bounds read flaw in libsoup, a GNOME library for HTTP operations. It occurs when parsing multipart HTTP messages due to an integer type mismatch causing incorrect length truncation. This leads to a buffer over-read, potentially exposing heap memory contents or crashing applications.

Impact Analysis

This vulnerability could allow a remote attacker to crash applications using libsoup or disclose sensitive heap memory contents. It may lead to denial-of-service conditions or unintended data exposure, depending on the application's use of libsoup.

Compliance Impact

This vulnerability could potentially lead to unintended data exposure by disclosing heap memory contents, which may include sensitive information. This could impact compliance with GDPR (data protection) and HIPAA (health data privacy) if exploited.

Mitigation Strategies

Monitor for updates from libsoup maintainers and apply patches once available. Avoid processing untrusted multipart HTTP messages until a fix is released. Consider disabling affected services if possible.

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