Libsoup: out-of-bounds read in cookie date handling of libsoup http library

Summary

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.

Timeline

1. Sep 26, 2025, 8:36 AM UTCCVE published
2. Sep 26, 2025, 3:34 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: partial

3. Jun 29, 2026, 8:28 PM 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