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gvfs SFTP CVE-2026-84268

| EUVDEUVD-2026-69287 HIGH
Heap-based Buffer Overflow (CWE-122)
2026-09-01 redhat GHSA-8cxg-v7p7-qc7j
8.8
CVSS 3.1 · Vendor: redhat
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Severity by source

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

Attacker controls the server and needs no client credentials (PR:N); user must mount the share (UI:R); heap overflow yields full triad impact if RCE is achieved.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/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
8.8 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
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Sep 01, 2026 - 16:21 vuln.today
CVE Published
Sep 01, 2026 - 15:15 nvd
HIGH 8.8

DescriptionCVE.org

A flaw was found in the SFTP backend in gvfs. When mounting a share and reading a file, a malicious SFTP server can cause read_reply() to process a length that exceeds the size requested by the client. The function does not verify the server-provided length against the allocated buffer size, causing the operation to write past the intended boundaries. This issue allows a malicious server to corrupt adjacent heap memory in the gvfsd-sftp process, resulting in a denial of service as the process aborts upon detecting the heap corruption or potentially allowing arbitrary code execution.

AnalysisAI

Heap-based buffer overflow in the gvfs SFTP backend (gvfsd-sftp) exposes GNOME desktop users to process-level denial of service or potential arbitrary code execution when connecting to a malicious SFTP server. The read_reply() function trusts the server-supplied response length without validating it against the client's allocated buffer, allowing a rogue server to overflow adjacent heap memory in the gvfsd-sftp daemon. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
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Delivery
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Exploit
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Install
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C2
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Execute
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires a GNOME desktop user to actively mount an attacker-controlled SFTP server endpoint through gvfs - for example, by navigating to an sftp:// URI in GNOME Files (Nautilus), using the 'Connect to Server' dialog, or via any application that invokes gvfs SFTP mounts. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 8.8 rating is justified for worst-case RCE outcomes but requires a critical caveat: the UI:R (user interaction required) constraint means exploitation is not remotely triggerable without social engineering - an attacker must first induce the victim to mount a malicious SFTP share. … 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 No vendor-released patch version is confirmed in the available input data - patch availability should be tracked via the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-84268 and the upstream fix discussion at https://gitlab.gnome.org/GNOME/gvfs/-/issues/862. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, inventory all GNOME desktop systems and identify which users require SFTP mounting functionality to establish an accurate risk profile. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
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SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server 16.0 Affected
SUSE Linux Enterprise Server 16.1 Affected

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CVE-2026-84268 vulnerability details – vuln.today

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