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Fencer Intel
medium 6.5

CVE-2025-4969 json

Libsoup: off-by-one out-of-bounds read in find_boundary() in soup-multipart.c

published last yr. modified 4d ago also EUVD-2025-16077

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 60%
public exploits
0
none known

Summary

A vulnerability was found in the libsoup package. This flaw stems from its failure to correctly verify the termination of multipart HTTP messages. This can allow a remote attacker to send a specially crafted multipart HTTP body, causing the libsoup-consuming server to read beyond its allocated memory boundaries (out-of-bounds read).

Patch / fix

  • libsoup3 Debian 13 3.6.5-2

debian advisories DEBIAN-CVE-2025-4969

  • 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-2025-4969

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 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 CBL-Mariner 2.0 3.0.4-9
  • libsoup Azure Linux 3.0 3.4.4-9

azure linux advisories AZL-61945AZL-61958

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-2025-4969 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.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-4969 updated cvss 6.5

libsoup: Off-by-One Out-of-Bounds Read in find_boundary() in soup-multipart.c

  • Red Hat Enterprise Linux 6 libsoup Red Hat Enterprise Linux 7 libsoup Red Hat Enterprise Linux 8 libsoup
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 9 libsoup Red Hat Enterprise Linux 10 libsoup3
    affected: no fix available “Fix deferred”

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
none
Automatable
yes
Technical impact
partial
Assessed
last yr.

Exploit prediction

0.91% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

Affected products

  • gitlab.gnome.org libsoup
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness

References

Sources

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.