7.5

CVE-2025-11021: libsoup3 Out-of-bounds Read

CVSS: 7.5v3.1HighDeferred
AliasesSUSE-SU-2025:20937-1SUSE-SU-2025:20965-1SUSE-SU-2025:3752-1
Published 26-09-2025Last modified 29-06-2026
Open JSON

Vulnerability summary

CVE-2025-11021 is a high (CVSS 7.5) Out-of-bounds Read vulnerability in libsoup3. EPSS estimates a 0.64% chance of exploitation in the next 30 days, higher than 49.5% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.64%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 15 · Related 3
OPENSUSE-SU-2026:20142-1RHSA-2025:19713RHSA-2025:19714RHSA-2025:20959RHSA-2025:21032RHSA-2025:21655

Timeline

  1. 26-09-2025
    PublishedVulnerability first disclosed.
  2. 29-06-2026
    Last modifiedVulnerability information updated.

Description

A flaw was found in the cookie date handling logic of the libsoup HTTP library, widely used by GNOME and other applications for web communication. When processing cookies with specially crafted expiration dates, the library may perform an out-of-bounds memory read. This flaw could result in unintended disclosure of memory contents, potentially exposing sensitive information from the process using libsoup.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.64%

Chance of exploitation in the next 30 days

Percentile

50%

Versus all other CVEs

30-day change

0.00 pp

From 0.64% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.64%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Suse14 products
  • libsoup&distro=SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS< 3.0.4-150400.3.18.1
  • libsoup&distro=SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS< 3.0.4-150400.3.18.1
  • libsoup&distro=SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS< 3.0.4-150400.3.18.1
  • libsoup&distro=SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS< 3.0.4-150400.3.18.1
  • libsoup&distro=SUSE Linux Enterprise Module for Basesystem 15 SP6< 3.4.4-150600.3.18.1
Redhat5 products
  • libsoup3< 0:3.6.5-3.el10_0.7
  • libsoup3-debuginfo< 0:3.6.5-3.el10_0.7
  • libsoup3-debugsource< 0:3.6.5-3.el10_0.7
  • libsoup3-devel< 0:3.6.5-3.el10_0.7
  • libsoup3-doc< 0:3.6.5-3.el10_0.7
Opensuse2 products
  • libsoup&distro=openSUSE Leap 15.6< 3.4.4-150600.3.18.1
  • libsoup&distro=openSUSE Tumbleweed< 3.6.5-7.1
Ubuntu2 products
  • libsoup2.4< 2.52.2-1ubuntu0.3+esm5 | < 2.62.1-1ubuntu0.4+esm6 | < 2.70.0-1ubuntu0.5+esm1 | < 2.74.2-3ubuntu0.6 | < 2.74.3-6ubuntu1.6 | < 2.74.3-10.1ubuntu4
  • libsoup3< 3.0.7-0ubuntu1+esm5 | < 3.4.4-5ubuntu0.5 | < 3.6.5-3
Debian1 product
  • libsoup3All versions (No fix recorded) | < 3.6.5-5

5 vendors · 24 products

References

28 links
Show all 28 references