HIGH

CVE-2025-4948

Libsoup: integer underflow in soup_multipart_new_from_message() leading to denial of service in libsoup

CVSS v3

7.5

HIGH

EPSS Score

0.8 %

exploit probability, as of 2026-10-18

CISA KEV

known exploited

Exploitation

none

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

libsoupAlmaLinux:9all versions · fixed in 2.72.0-10.el9_6.2and 1 other package
libsoupAlmaLinux:8all versions · fixed in 2.62.3-9.el8_10and 1 other package
libsoup3-docAlmaLinux:10all versions · fixed in 3.6.5-3.el10_0.6

Vendor advisories

CVE-2025-4948 Red Hat Product Security285 products fixed · 3 known affected
libsoup: Integer Underflow in soup_multipart_new_from_message() Leading to Denial of Service in libsoup
libsoup as a component of Red Hat Enterprise Linux 6 · libsoup-devel as a component of Red Hat Enterprise Linux 6 · libsoup.src as a component of Red Hat Enterprise Linux 6
RHSA-2025:21657 Red Hat Product Security22 products fixed
Red Hat Security Advisory: libsoup security update
RHSA-2025:9179 Red Hat Product Security16 products fixed
Red Hat Security Advisory: libsoup security update
RHSA-2025:8663 Red Hat Product Security13 products fixed
Red Hat Security Advisory: libsoup security update
RHSA-2025:8482 Red Hat Product Security57 products fixed
Red Hat Security Advisory: libsoup security update
RHSA-2025:8480 Red Hat Product Security13 products fixed
Red Hat Security Advisory: libsoup security update

7 more advisories

Full record on NVD

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.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2025-05-19
Last Modified: 2026-04-15

Frequently asked questions

What is CVE-2025-4948?

Is CVE-2025-4948 actively exploited?

Active exploitation of CVE-2025-4948 has not been confirmed. Its EPSS score was 0.8% on 2026-10-18, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-4948?

CVE-2025-4948 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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