CVE-2026-84268

Gvfs: sftp: heap-based buffer overflow in read_reply()

State: Published
Severity: 8.8 High
Published: Sep 1, 2026
Updated: Oct 21, 2026
Reserved: Sep 1, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	redhat

Weaknesses

CWE-122 Heap-based Buffer Overflow

Affected Products

Product	Versions
gvfsGNOME	before 1.60.2Affected
Red Hat Enterprise Linux 10Red Hat	0:1.54.4-4.el10_2.1 and laterNot affected
Red Hat Enterprise Linux 10.0 Extended Update SupportRed Hat	0:1.54.4-2.el10_0.2 and laterNot affected
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat	0:1.36.2-7.el7_9.1 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:1.36.2-22.el8_10 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat	0:1.36.2-11.el8_4.1 and laterNot affected
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat	0:1.36.2-11.el8_4.1 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat	0:1.36.2-11.el8_6.1 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRed Hat	0:1.36.2-11.el8_6.1 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat	0:1.36.2-14.el8_8.1 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat	0:1.36.2-14.el8_8.1 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:1.48.1-8.el9_8.1 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat	0:1.48.1-4.el9_2.1 and laterNot affected
Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsRed Hat	0:1.48.1-4.el9_4.1 and laterNot affected
Red Hat Enterprise Linux 9.6 Extended Update SupportRed Hat	0:1.48.1-6.el9_6.1 and laterNot affected
Red Hat Enterprise Linux 6Red Hat

References

RHSA-2026:73997vendor-advisory
RHSA-2026:73998vendor-advisory
RHSA-2026:74370vendor-advisory
RHSA-2026:85939vendor-advisory
RHSA-2026:85940vendor-advisory
RHSA-2026:85941vendor-advisory
RHSA-2026:85942vendor-advisory
RHSA-2026:85943vendor-advisory
RHSA-2026:85944vendor-advisory
RHSA-2026:85945vendor-advisory
RHSA-2026:86606vendor-advisory
https://access.redhat.com/security/cve/CVE-2026-84268vdb-entry
RHBZ#2526485issue-tracking
https://gitlab.gnome.org/GNOME/gvfs/-/issues/862

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