CVE-2025-4948 json
Libsoup: integer underflow in soup_multipart_new_from_message() leading to denial of service in libsoup
published last yr. modified 5d ago also EUVD-2025-15741
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.1%
- EPSS 1.1% chance of exploitation in 30 days, percentile 66%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Red Hat Red Hat Enterprise Linux 10 0:3.6.5-3.el10_0.6
- Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:2.62.2-9.el7_9
- Red Hat Red Hat Enterprise Linux 8 0:2.62.3-9.el8_10
- Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support 0:2.62.3-1.el8_2.5
- Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:2.62.3-2.el8_4.5
- Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:2.62.3-2.el8_6.5
- Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service 0:2.62.3-2.el8_6.5
- Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions 0:2.62.3-2.el8_6.5
- Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support 0:2.62.3-3.el8_8.5
- Red Hat Red Hat Enterprise Linux 9 0:2.72.0-10.el9_6.2
- Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions 0:2.72.0-8.el9_0.5
- Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support 0:2.72.0-8.el9_2.5
- Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support 0:2.72.0-8.el9_4.5
- libsoup3 Debian 13 3.6.5-2
debian advisories DEBIAN-CVE-2025-4948
- libsoup3 Ubuntu 24.04 LTS 3.4.4-5ubuntu0.5
- libsoup3 Ubuntu 25.10 3.6.5-3
- libsoup2.4 Ubuntu 22.04 LTS 2.74.2-3ubuntu0.6
- libsoup2.4 Ubuntu 24.04 LTS 2.74.3-6ubuntu1.6
- libsoup2.4 Ubuntu 26.04 LTS, Ubuntu 25.10 2.74.3-10.1ubuntu4
- libsoup3 Ubuntu Pro 22.04 LTS 3.0.7-0ubuntu1+esm5
- libsoup2.4 Ubuntu Pro 16.04 LTS 2.52.2-1ubuntu0.3+esm5
- libsoup2.4 Ubuntu Pro 18.04 LTS 2.62.1-1ubuntu0.4+esm6
ubuntu advisories UBUNTU-CVE-2025-4948
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- libsoup RHEL 8 2.62.3-9.el8_10
- libsoup3 RHEL 10.0 3.6.5-3.el10_0.6
- libsoup RHEL 9 2.72.0-10.el9_6.2
- libsoup RHEL 7 ELS 2.62.2-9.el7_9
- libsoup RHEL 7 ELS 2.62.2-6.el7_9
- libsoup RHEL 8.4 AUS 2.62.3-2.el8_4.5
- libsoup RHEL 8.6 TUS, RHEL 8.6 E4S, RHEL 8.6 AUS 2.62.3-2.el8_6.5
- libsoup RHEL 8.2 AUS 2.62.3-1.el8_2.5
red hat advisories RHSA-2025:21657RHSA-2025:9179RHSA-2025:8663RHSA-2025:8482RHSA-2025:8480RHSA-2025:8481
- libsoup Linux Micro 6.1 3.4.4-slfo.1.1_4.1
- libsoup Linux Micro 6.0 3.4.2-8.1
- libsoup2 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +10 more 2.74.2-150400.3.9.1
- libsoup SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +7 more 3.0.4-150400.3.10.1
- libsoup SLE Module for Basesystem 15 SP7, SLE Module for Basesystem 15 SP6, openSUSE Leap 15.6 3.4.4-150600.3.10.1
- libsoup2 SLE Module for Basesystem 15 SP7, SLE Module for Basesystem 15 SP6, openSUSE Leap 15.6 2.74.3-150600.4.9.1
- libsoup SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE Micro 5.2 +2 more 2.68.4-150200.4.9.1
- libsoup SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 2.62.2-5.15.1
suse advisories SUSE-SU-2025:20598-1SUSE-SU-2025:20453-1SUSE-SU-2025:01864-1SUSE-SU-2025:01817-1SUSE-SU-2025:01812-1SUSE-SU-2025:01802-1
- libsoup2 openSUSE Tumbleweed 2.74.3-11.1
- libsoup openSUSE Tumbleweed 3.6.5-5.1
opensuse advisories openSUSE-SU-2025:15189-1openSUSE-SU-2025:15185-1
- libsoup AlmaLinux 9 2.72.0-10.el9_6.2
- libsoup AlmaLinux 8 2.62.3-9.el8_10
almalinux advisories ALSA-2025:8126ALSA-2025:8132
- libsoup Rocky Linux 9 2.72.0-10.el9_6.2
- libsoup3 Rocky Linux 10 3.6.5-3.el10_0.6
- libsoup Rocky Linux 8 2.62.3-9.el8_10
rocky linux advisories RLSA-2025:8126RLSA-2025:8128RLSA-2025:8132
- libsoup CBL-Mariner 2.0 3.0.4-9
- libsoup Azure Linux 3.0 3.4.4-9
azure linux advisories AZL-61921AZL-61953
Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT
Is CVE-2025-4948 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerVendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2025-4948 updated cvss 7.5
libsoup: Integer Underflow in soup_multipart_new_from_message() Leading to Denial of Service in libsoup
-
Red Hat Enterprise Linux 6 libsoupaffected: workaround, no fix planned “Out of support scope”
-
Red Hat Enterprise Linux AppStream (v. 8) libsoup-devel 2.62.3-9.el8_10, libsoup-debuginfo 2.62.3-9.el8_10, libsoup-debugsource 2.62.3-9.el8_10fixed: vendor fix RHSA-2025:8132
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Red Hat Enterprise Linux AppStream (v. 9) libsoup 2.72.0-10.el9_6.2fixed: vendor fix RHSA-2025:8126
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Red Hat Enterprise Linux AppStream (v. 10) libsoup3 3.6.5-3.el10_0.6fixed: vendor fix RHSA-2025:8128
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Red Hat Enterprise Linux AppStream AUS (v. 8.2) libsoup-devel 2.62.3-1.el8_2.5, libsoup-debuginfo 2.62.3-1.el8_2.5, libsoup-debugsource 2.62.3-1.el8_2.5fixed: vendor fix RHSA-2025:8480
-
Red Hat Enterprise Linux AppStream AUS (v.8.4) libsoup-devel 2.62.3-2.el8_4.5, libsoup-debuginfo 2.62.3-2.el8_4.5, libsoup-debugsource 2.62.3-2.el8_4.5fixed: vendor fix RHSA-2025:8663
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Red Hat Enterprise Linux AppStream AUS (v.8.6) libsoup-devel 2.62.3-2.el8_6.5, libsoup-debuginfo 2.62.3-2.el8_6.5, libsoup-debugsource 2.62.3-2.el8_6.5 Red Hat Enterprise Linux AppStream E4S (v.8.6) libsoup-devel 2.62.3-2.el8_6.5, libsoup-debuginfo 2.62.3-2.el8_6.5, libsoup-debugsource 2.62.3-2.el8_6.5fixed: vendor fix RHSA-2025:8482
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Red Hat Enterprise Linux AppStream E4S (v.9.0) libsoup 2.72.0-8.el9_0.5fixed: vendor fix RHSA-2025:8481
show 12 moreshow fewer
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Red Hat Enterprise Linux AppStream EUS (v.8.8) libsoup-devel 2.62.3-3.el8_8.5, libsoup-debuginfo 2.62.3-3.el8_8.5, libsoup-debugsource 2.62.3-3.el8_8.5fixed: vendor fix RHSA-2025:8252
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Red Hat Enterprise Linux AppStream EUS (v.9.2) libsoup 2.72.0-8.el9_2.5fixed: vendor fix RHSA-2025:8140
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Red Hat Enterprise Linux AppStream EUS (v.9.4) libsoup 2.72.0-8.el9_4.5fixed: vendor fix RHSA-2025:8139
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Red Hat Enterprise Linux AppStream TUS (v.8.6) libsoup-devel 2.62.3-2.el8_6.5, libsoup-debuginfo 2.62.3-2.el8_6.5, libsoup-debugsource 2.62.3-2.el8_6.5fixed: vendor fix RHSA-2025:8482
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Red Hat Enterprise Linux BaseOS (v. 8) libsoup 2.62.3-9.el8_10fixed: vendor fix RHSA-2025:8132
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Red Hat Enterprise Linux BaseOS AUS (v. 8.2) libsoup 2.62.3-1.el8_2.5fixed: vendor fix RHSA-2025:8480
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Red Hat Enterprise Linux BaseOS AUS (v.8.4) libsoup 2.62.3-2.el8_4.5fixed: vendor fix RHSA-2025:8663
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Red Hat Enterprise Linux BaseOS AUS (v.8.6) libsoup 2.62.3-2.el8_6.5 Red Hat Enterprise Linux BaseOS E4S (v.8.6) libsoup 2.62.3-2.el8_6.5fixed: vendor fix RHSA-2025:8482
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Red Hat Enterprise Linux BaseOS EUS (v.8.8) libsoup 2.62.3-3.el8_8.5fixed: vendor fix RHSA-2025:8252
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Red Hat Enterprise Linux BaseOS TUS (v.8.6) libsoup 2.62.3-2.el8_6.5fixed: vendor fix RHSA-2025:8482
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Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libsoup3-doc 3.6.5-3.el10_0.6fixed: vendor fix RHSA-2025:8128
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Red Hat Enterprise Linux Server (v. 7 ELS) libsoup 2.62.2-9.el7_9fixed: vendor fix RHSA-2025:21657
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 4mo ago
Exploit prediction
1.12% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- gitlab.gnome.org https://gitlab.gnome.org/GNOME/libsoup/-/work_items/449 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected products
- gitlab.gnome.org libsoup
- Red Hat Red Hat Enterprise Linux 10
- Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support
- Red Hat Red Hat Enterprise Linux 8
- Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support
- Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
- Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
- Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service
- Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
- Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support
- Red Hat Red Hat Enterprise Linux 9
- Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions
- Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support
- Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support
- Red Hat Red Hat Enterprise Linux 6
Classification
- Weakness
-
- CWE-191 Integer Underflow (Wrap or Wraparound)
References
-
gitlab.gnome.org
/GNOME/libsoup/-/work_items/449
exploit
-
access.redhat.com
/errata/RHSA-2025:21657
vendor-advisory
-
access.redhat.com
/errata/RHSA-2025:8126
vendor-advisory
-
access.redhat.com
/errata/RHSA-2025:8128
vendor-advisory
-
access.redhat.com
/errata/RHSA-2025:8132
vendor-advisory
-
access.redhat.com
/errata/RHSA-2025:8139
vendor-advisory
-
access.redhat.com
/errata/RHSA-2025:8140
vendor-advisory
-
access.redhat.com
/errata/RHSA-2025:8252
vendor-advisory
-
access.redhat.com
/errata/RHSA-2025:8480
vendor-advisory
-
access.redhat.com
/errata/RHSA-2025:8481
vendor-advisory
-
access.redhat.com
/errata/RHSA-2025:8482
vendor-advisory
-
access.redhat.com
/errata/RHSA-2025:8663
vendor-advisory
-
access.redhat.com
/security/cve/CVE-2025-4948
vdb-entry
-
bugzilla.redhat.com
/show_bug.cgi?id=2367183
issue-tracking
- gitlab.gnome.org /GNOME/libsoup/-/issues/449
Sources
- CVE List CVE-2025-4948
- NVD CVE-2025-4948
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.