Security Advisory

CVE-2026-85534

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-09-04 10:19:22

Last updated 2026-09-04 16:07:27

Assigner redhat

CVSS score 5.9

State PUBLISHED

Description

A flaw was found in libsoup. When a client sends an HTTP/2 request body from a non-pollable input stream, the library can buffer more data than the current flow-control window later allows. A malicious HTTP/2 server can shrink SETTINGS_INITIAL_WINDOW_SIZE while that buffered read is still in progress. The client then copies the full buffer into a smaller DATA callback without a runtime bounds check, which can abort the process or fail the HTTP/2 session.

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