Vulnerability · Published Sep 4, 2026 · Assigned by redhat
CVE-2026-85197Libsoup: libsoup: heap use-after-free in libsoup http/2 client on_data_read() via goaway during body upload
High 7.6
In plain English
A high-severity use-after-free in Red Hat Enterprise Linux 10 from Red Hat. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | libsoup3 | 3.6.5-3.el10_2.14 | ALSA-2026:68235 |
| AlmaLinux:10 | libsoup3-devel | 3.6.5-3.el10_2.14 | ALSA-2026:68235 |
| AlmaLinux:10 | libsoup3-doc | 3.6.5-3.el10_2.14 | ALSA-2026:68235 |
| Debian:12 | libsoup3 | no fix listed | DEBIAN-CVE-2026-85197 |
| Debian:13 | libsoup3 | no fix listed | DEBIAN-CVE-2026-85197 |
| Ubuntu:22.04:LTS | libsoup2.4 | 2.74.2-3ubuntu0.9 | USN-8890-1 |
| Ubuntu:24.04:LTS | libsoup2.4 | 2.74.3-6ubuntu1.9 | USN-8890-1 |
| Ubuntu:24.04:LTS | libsoup3 | 3.4.4-5ubuntu0.9 | UBUNTU-CVE-2026-85197 |
| Ubuntu:24.04:LTS | libsoup3 | 3.4.4-5ubuntu0.9 | USN-8890-1 |
| Ubuntu:26.04:LTS | libsoup3 | 3.6.6-1ubuntu0.1 | USN-8890-1 |
| Ubuntu:26.04:LTS | libsoup3 | 3.6.6-1ubuntu0.1 | UBUNTU-CVE-2026-85197 |
| Ubuntu:26.10 | libsoup3 | 3.6.6-1ubuntu3 | UBUNTU-CVE-2026-85197 |
| Ubuntu:26.10 | libsoup3 | 3.6.6-1ubuntu3 | USN-8890-2 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | see references |
| Red Hat | Red Hat Enterprise Linux 6 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
Weakness: CWE-416 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
References
- RHSA-2026:68235 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:82728 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-85197 vdb-entry, x_refsource_REDHAT
- RHBZ#2528425 issue-tracking, x_refsource_REDHAT
- https://gitlab.gnome.org/GNOME/libsoup/-/work_items/552