Libsoup: integer overflow in cookie expiration date handling in libsoup

Summary

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

1. May 19, 2025, 5:03 PM UTCCVE published
2. Mar 19, 2026, 6:15 PM UTCCISA SSVC assessment

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

3. Jun 30, 2026, 10:40 AM UTCRecord last updated

Affected versions

• libsoup

  through 3.6.5

• libsoup3

  Version range not reported

• libsoup3

  Version range not reported

• libsoup

  Version range not reported

• libsoup

  Version range not reported

• libsoup

  Version range not reported

• libsoup

  Version range not reported

• libsoup

  Version range not reported

• libsoup

  Version range not reported

• libsoup

  Version range not reported

• libsoup

  Version range not reported

• libsoup

  Version range not reported

• libsoup

  Version range not reported

• libsoup

  Version range not reported

• libsoup

  Version range not reported

• libsoup

  Version range not reported

• libsoup

  Version range not reported

• libsoup

  Version range not reported

• libsoup

  Version range not reported

References 16