CVE-2025-4945Libsoup: integer overflow in cookie expiration date handling in libsoup

Description

A flaw was found in the cookie parsing logic of the libsoup HTTP library, used in GNOME applications and other software. The vulnerability arises when processing the expiration date of cookies, where a specially crafted value can trigger an integer overflow. This may result in undefined behavior, allowing an attacker to bypass cookie expiration logic, causing persistent or unintended cookie behavior. The issue stems from improper validation of large integer inputs during date arithmetic operations within the cookie parsing routines.

Timeline

Scores

EPSS (exploitation in 30 days)

0.70% · top 46% of all CVEs (12 Nov 2026)

CISA SSVC

Exploitation: poc · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Low 3.7.

Affected products

• libsoup

  • affected ≤ 3.6.5

• Red Hat · Red Hat Enterprise Linux 10

  • unaffected 0:3.6.5-3.el10_0.9 – < *

• Red Hat · Red Hat Enterprise Linux 10

  • unaffected 0:3.6.5-3.el10_1.6 – < *

• Red Hat · Red Hat Enterprise Linux 7 Extended Lifecycle Support

  • unaffected 0:2.62.2-9.el7_9 – < *

• Red Hat · Red Hat Enterprise Linux 8

  • unaffected 0:2.62.3-10.el8_10 – < *

• Red Hat · Red Hat Enterprise Linux 8

  • unaffected 0:2.62.3-10.el8_10 – < *

• Red Hat · Red Hat Enterprise Linux 8.2 Advanced Update Support

  • unaffected 0:2.62.3-1.el8_2.6 – < *

• Red Hat · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

  • unaffected 0:2.62.3-2.el8_4.6 – < *

• Red Hat · Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

  • unaffected 0:2.62.3-2.el8_4.6 – < *

• Red Hat · Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

  • unaffected 0:2.62.3-2.el8_6.6 – < *

• Red Hat · Red Hat Enterprise Linux 8.6 Telecommunications Update Service

  • unaffected 0:2.62.3-2.el8_6.6 – < *

• Red Hat · Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions

  • unaffected 0:2.62.3-2.el8_6.6 – < *

• Red Hat · Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

  • unaffected 0:2.62.3-3.el8_8.6 – < *

• Red Hat · Red Hat Enterprise Linux 9

  • unaffected 0:2.72.0-10.el9_6.3 – < *

• Red Hat · Red Hat Enterprise Linux 9

  • unaffected 0:2.72.0-12.el9_7.1 – < *

• Red Hat · Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

  • unaffected 0:2.72.0-8.el9_0.6 – < *

• Red Hat · Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

  • unaffected 0:2.72.0-8.el9_2.6 – < *

• Red Hat · Red Hat Enterprise Linux 9.4 Extended Update Support

  • unaffected 0:2.72.0-8.el9_4.6 – < *

• Red Hat · Red Hat Enterprise Linux 6

  All versions: unknown

What to do

Workaround: To mitigate the risk associated with this libsoup vulnerability, Red Hat recommends avoiding interactions between client applications using the libsoup library and untrusted or compromised HTTP servers until a patched version of libsoup is deployed. Users and administrators should monitor their systems for suspicious HTTP activity and apply vendor updates as soon as a fix becomes available to prevent manipulation of cookie expiration logic that could lead to unexpected behavior or policy circumvention.

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2025-16034 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2025-4945](https://cveledger.app/badge/CVE-2025-4945.svg)](https://cveledger.app/cve/CVE-2025-4945)

Record last updated 6 Nov 2026, 15:28 UTC.