CVE-2026-85197 Libsoup: libsoup: heap use-after-free in libsoup http/2 client on_data_read() via goaway during body upload
A heap use-after-free in libsoup's HTTP/2 client allows attackers to trigger memory corruption, potentially leading to code execution or information disclosure.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-85197?
CVE-2026-85197 is a high-severity use after free vulnerability in Red Hat Enterprise Linux 10, published on 4 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
A flaw was found in libsoup. A malicious HTTP/2 server or a Man-in-the-Middle (MITM) attacker can exploit a heap use-after-free vulnerability in the HTTP/2 client implementation. This occurs when a GNOME application uploads a file using HTTP/2, and the server sends a GOAWAY frame while the file body is being read asynchronously. This can lead to memory corruption, potentially resulting in information disclosure or arbitrary code execution.
Weakness: CWE-416
Which versions are affected by CVE-2026-85197?
Linux distribution packages (5)
libsoup3 Red Hat:enterprise_linux_eus:10.0 | All versions | 0:3.6.5-3.el10_0.18 |
libsoup3-debuginfo Red Hat:enterprise_linux_eus:10.0 | All versions | 0:3.6.5-3.el10_0.18 |
libsoup3-debugsource Red Hat:enterprise_linux_eus:10.0 | All versions | 0:3.6.5-3.el10_0.18 |
libsoup3-devel Red Hat:enterprise_linux_eus:10.0 | All versions | 0:3.6.5-3.el10_0.18 |
libsoup3-doc Red Hat:enterprise_linux_eus:10.0 | All versions | 0:3.6.5-3.el10_0.18 |
How do I fix CVE-2026-85197?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-85197 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-85197 exists.
Sources
Also known as AZL-99915, DEBIAN-CVE-2026-85197, ECHO-6373-a6e1-b411, GHSA-pq26-x6qp-8qr7, RHSA-2026:82728, ROOT-OS-DEBIAN-13-CVE-2026-85197 and 1 more.