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CVE-2026-84268— Gvfs: sftp: heap-based buffer overflow in read_reply()

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 ag

CVSS 8.8 · High
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I. Basic Information for CVE-2026-84268

Vulnerability Information
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Vulnerability Title
Gvfs: sftp: heap-based buffer overflow in read_reply()
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-84268

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III. Intelligence Information for CVE-2026-84268

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Other References for CVE-2026-84268 (3)

Same Patch Batch · Red Hat · 2026-09-01 · 10 CVEs total

CVE-2026-84218 8.1 HIGH Org.jolokia/jolokia-core: incomplete jndi denylist in jolokia jsr-160 proxy (bypass of cve
CVE-2026-49329 7.5 HIGH Openshift/oauth-server: openshift/oauth-server: quadratic-time dos via accept-language hea
CVE-2026-84233 7.0 HIGH Rpm: command execution via macro expansion in `rpmuncompress -x` for crafted `.gem` filena
CVE-2026-84269 6.5 MEDIUM Gvfs: afp: heap-based buffer overflow in dsi read path
CVE-2026-11873 6.5 MEDIUM Pki-core: dogtag-pki: empty request to dogtag /ca/rest/certrequests causes http 500, java
CVE-2026-84232 5.4 MEDIUM Pulpcore: python-pulpcore: stored cross-site scripting via inline rendering of uploaded ht
CVE-2026-53682 5.3 MEDIUM Pki-core: dogtag-pki: unauthenticated dogtag ca rest api exposes security domain hosts
CVE-2026-84270 4.3 MEDIUM Gvfs: mtp: out-of-bounds read in do_read()
CVE-2026-84267 4.3 MEDIUM Gvfs: sftp: uninitialized heap disclosure in read_string()

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-122

V. Comments for CVE-2026-84268

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