---
id: CVE-2026-85197
title: A flaw was found in libsoup
summary: >-
  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 …
severity: high
cvss: 7.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H'
cwe:
  - CWE-416
vendor: Red Hat
product: libsoup3
affected:
  - libsoup3 (all versions)
  - libsoup
  - libsoup
  - libsoup
  - libsoup
published: '2026-09-04'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T18:17:17.720'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85197'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:68235'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-85197'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2528425'
    label: secalert@redhat.com
  - url: 'https://gitlab.gnome.org/GNOME/libsoup/-/work_items/552'
    label: secalert@redhat.com
  - url: 'https://gitlab.gnome.org/GNOME/libsoup/-/work_items/552'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-85197.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-85197'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85197'
tags:
  - nvd
  - cve.org
  - exploit-available
  - csaf
  - vex
  - red-hat
epss: 0.00222
epssPercentile: 0.13081
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-04T18:15:03.474491Z'
ingestedAt: '2026-09-08T20:10:03.163Z'
patched:
  - enterprise_linux_appstream_v_10
  - enterprise_linux_codeready_linux_builder_v_10
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **RHSA-2026:68235** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68235)