CVE-2025-4948: Integer Underflow (CVSS 7.5)

Description

A flaw was found in the soup_multipart_new_from_message() function of the libsoup HTTP library, which is commonly used by GNOME and other applications to handle web communications. The issue occurs when the library processes specially crafted multipart messages. Due to improper validation, an internal calculation can go wrong, leading to an integer underflow. This can cause the program to access invalid memory and crash. As a result, any application or server using libsoup could be forced to exit unexpectedly, creating a denial-of-service (DoS) risk.

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CVSS v3.1 Score

7.5

HIGH

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

Weakness Type (CWE)

CWE-191 CWE-191

References

Other References

https://access.redhat.com/errata/RHSA-2025:21657 https://access.redhat.com/errata/RHSA-2025:8126 https://access.redhat.com/errata/RHSA-2025:8128 https://access.redhat.com/errata/RHSA-2025:8132 https://access.redhat.com/errata/RHSA-2025:8139 https://access.redhat.com/errata/RHSA-2025:8140 https://access.redhat.com/errata/RHSA-2025:8252 https://access.redhat.com/errata/RHSA-2025:8480 https://access.redhat.com/errata/RHSA-2025:8481 https://access.redhat.com/errata/RHSA-2025:8482

Frequently Asked Questions

What is CVE-2025-4948? +

A flaw was found in the soup_multipart_new_from_message() function of the libsoup HTTP library, which is commonly used by GNOME and other applications to handle web communications. The issue occurs when the library processes specially crafted multipart messages. Due to improper validation, an internal calculation can go wrong, leading to an integer underflow. This can cause the program to access invalid memory and crash. As a result, any application or server using libsoup could be forced to exit unexpectedly, creating a denial-of-service (DoS) risk. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-4948? +

CVE-2025-4948 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

How do I check if I'm vulnerable to CVE-2025-4948? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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