CVE-2026-85534: Libsoup: libsoup: http/2 client crash in on_data_source_read_callback when settings initial_window_size shrinks during deferred body read

Overview

Severity

Medium (CVSS 5.9)

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Status

Not Exploited

Patch Tuesday

2026-Sep

Released

2026-09-09

EPSS Score

0.32% (percentile: 24.1%)

Affected Products (1)

Other

• 21478-17084

Security Updates (1)

• Security Update

Revision History

• 2026-09-09: Information published.