Buffer overflow in GNOME Gvfs
CVE-2026-84268
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (28.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 28.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.000
Affected products
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-84268 (vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
- gitlab.gnome.org/GNOME/gvfs/-/issues/862
- access.redhat.com/errata/RHSA-2026:73997 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:73998 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:74370 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-84268?
- CVE-2026-84268 is a high-severity vulnerability in GNOME Gvfs, classified under Heap-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-09-01.
- How severe is CVE-2026-84268?
- High severity. CVSS v3 base score is 8.8 out of 10.