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libsoup CVE-2026-85197

| EUVDEUVD-2026-70953 HIGH
Use After Free (CWE-416)
2026-09-04 redhat GHSA-pq26-x6qp-8qr7
RCE Information Disclosure Use After Free Memory Corruption Red Hat Red Hat Enterprise Linux 10 Red Hat Enterprise Linux 6 Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 9 Suse Red Hat
7.6
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
7.6 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
vuln.today AI
7.6 HIGH

Malicious-server path requires no special network position (AV:N/AC:L); user must initiate upload (UI:R); crash is near-certain (A:H); RCE and info-leak are possible but not guaranteed (C:L/I:L).

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
SUSE
7.5 HIGH
AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Red Hat
7.6 HIGH
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
High

Lifecycle Timeline

3
Metadata Corrected
Sep 04, 2026 - 08:40 vuln.today
tag: Buffer Overflow removed
Analysis Generated
Sep 04, 2026 - 08:01 vuln.today
CVE Published
Sep 04, 2026 - 07:34 cve.org
HIGH 7.6

DescriptionCVE.org

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.

AnalysisAI

Heap use-after-free in libsoup's HTTP/2 client implementation allows a malicious HTTP/2 server or MITM attacker to corrupt memory during asynchronous file upload operations. When a GNOME application uploads a file over HTTP/2 and the server sends a GOAWAY frame while the request body is being read asynchronously, the freed memory region can be accessed again, leading to information disclosure or arbitrary code execution on the client. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Persist
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Vulnerability AssessmentAI

Exploitation Exploitation requires the victim to be running a GNOME application that performs HTTP/2 file uploads (not all libsoup usage is HTTP/2 or file-upload based - HTTP/1.x connections are not affected). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 3.1 vector AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H yields 7.6, which is a reasonable baseline. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the patched libsoup package when released by Red Hat via RHSA advisory linked from https://access.redhat.com/security/cve/CVE-2026-85197 - the exact fix version is not independently confirmed in the available input data (no specific patched RPM version is cited). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all GNOME and Linux desktop applications in use that depend on libsoup and document internal file-upload workflows involving untrusted networks or cloud services. …

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Same weakness CWE-416 – Use After Free

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise Micro 5.3 Not-Affected
SUSE Linux Enterprise Micro 5.4 Not-Affected
SUSE Linux Enterprise Micro 5.5 Not-Affected

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CVE-2026-85197 vulnerability details – vuln.today
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