CVE-2026-85197
Received Received - Intake

Heap Use-After-Free in GNOME libsoup HTTP/2 Client

Publication date: 2026-09-04

Last updated on: 2026-09-04

Assigner: redhat-SADP

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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-09-04
Last Modified
2026-09-04
Generated
2026-09-04
AI Q&A
2026-09-04
EPSS Evaluated
N/A
NVD
CVE-2026-85197
EUVD
EUVD-2026-70953

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
gnome libsoup to 2026-09-04 (exc)

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

CVE-2026-85197 is a heap use-after-free vulnerability in libsoup's HTTP/2 client implementation. It 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 leads to memory corruption, potentially causing information disclosure or arbitrary code execution.

Detection Guidance

Detecting this vulnerability requires monitoring for HTTP/2 GOAWAY frames during file uploads in GNOME applications using libsoup. Check logs for crashes in applications like GNOME Web, GNOME Software, or Flatpak during HTTP/2 file transfers. Use network sniffing tools like Wireshark to inspect HTTP/2 traffic for GOAWAY frames sent during active uploads.

Impact Analysis

This vulnerability can be exploited by a malicious HTTP/2 server or a man-in-the-middle attacker when you use affected GNOME applications like GNOME Web, GNOME Software, or Flatpak to upload files over HTTPS. It may result in memory corruption, leading to information disclosure or arbitrary code execution on your system.

Compliance Impact

This vulnerability could lead to information disclosure, which may violate data protection requirements under GDPR or HIPAA if sensitive data is exposed. Organizations using affected GNOME applications for file uploads must address this flaw to maintain compliance.

Mitigation Strategies

No immediate mitigation is currently available per Red Hat. Monitor official updates for libsoup or affected GNOME applications. Avoid using HTTP/2 for file uploads in GNOME applications until patches are released. Consider disabling HTTP/2 support in applications if possible.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-85197. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart