CVE-2025-11021

HIGH

Libsoup - Info Disclosure

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2025-11021. PoCs published by ValentinTorassa.

AI-analyzed exploit summary This repository contains detailed patch files and technical analysis for multiple CVEs, including CVE-2025-11021, which involves an out-of-bounds read in libsoup3's cookie date parsing due to integer overflow in parse_timezone(). The patches include input validation and bounds checks to prevent memory corruption.

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.

Exploits (1)

nomisec WRITEUP
by ValentinTorassa · poc
https://github.com/ValentinTorassa/ubuntu-security-fixes

This repository contains detailed patch files and technical analysis for multiple CVEs, including CVE-2025-11021, which involves an out-of-bounds read in libsoup3's cookie date parsing due to integer overflow in parse_timezone(). The patches include input validation and bounds checks to prevent memory corruption.

Classification
Writeup 100%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: libsoup3 (version 3.0.7 and earlier)
No auth needed
Prerequisites: malformed cookie data with crafted date/time values
devstral-2 · analyzed Jun 18, 2026 Full analysis →

References (16)

Core 16
Core References
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:18183
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:19713
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:19714
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:20959
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:21032
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:21655
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:21656
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:21657
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:21664
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:21665
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:21666
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:21772
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:22013
Vendor Advisory vdb-entry x_refsource_redhat
https://access.redhat.com/security/cve/CVE-2025-11021
Issue Tracking issue-tracking x_refsource_redhat
https://bugzilla.redhat.com/show_bug.cgi?id=2399627

Scores

CVSS v3 7.5
EPSS 0.0047
EPSS Percentile 37.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-125
Status published
Products (17)
Red Hat/Red Hat Enterprise Linux 10 0:3.6.5-3.el10_0.7
Red Hat/Red Hat Enterprise Linux 10 0:3.6.5-3.el10_1.6
Red Hat/Red Hat Enterprise Linux 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 0:2.62.3-10.el8_10
Red Hat/Red Hat Enterprise Linux 8.2 Advanced Update Support 0:2.62.3-1.el8_2.6
Red Hat/Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:2.62.3-2.el8_4.6
Red Hat/Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:2.62.3-2.el8_4.6
Red Hat/Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:2.62.3-2.el8_6.6
Red Hat/Red Hat Enterprise Linux 8.6 Telecommunications Update Service 0:2.62.3-2.el8_6.6
... and 7 more
Published Sep 26, 2025
Tracked Since Feb 18, 2026