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CVE-2026-84267— Gvfs: sftp: uninitialized heap disclosure in read_string()

Quick assessment

Affected
GNOME gvfs
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.

GNOME GVfs是GNOME基金会开源的一个虚拟文件系统。 GNOME GVfs存在资源管理错误漏洞，该漏洞源于read_string()函数分配缓冲区后未验证缓冲区是否完全填充，导致未初始化堆内容被用作文件句柄并回显给服务器，可能允许恶意SFTP服务器确定性地读取未初始化堆内存，泄露堆基址和libgio库加载地址，从而绕过地址空间布局随机化（ASLR）。

CVSS 4.3 · Medium EPSS 0.37% · P29

Affected Version Matrix 6

VendorProduct Version RangeStatus
GNOME gvfs 1.10.0< 1.60.2 affected
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 6 any unknown
Red Hat Red Hat Enterprise Linux 7 any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
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I. Basic Information for CVE-2026-84267

Vulnerability Information
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Vulnerability Title
Gvfs: sftp: uninitialized heap disclosure in read_string()
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the SFTP backend in gvfs. When mounting a share, a malicious SFTP server can cause read_string() to allocate a buffer with a certain length but the function does not verify that the buffer is completely filled, leaving the remainder of the buffer containing uninitialized heap contents. If the server sends a short FXP_HANDLE reply, these uninitialized bytes are taken as the file handle. The client will then echo these uninitialized bytes back to the server on all subsequent requests using that handle. With a length of 128 bytes, this issue allows the malicious server to deterministically read uninitialized heap memory from the gvfsd-sftp process, leaking its heap base and the load address of the libgio library, resulting in a deterministic defeat of Address Space Layout Randomization (ASLR).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对未经初始化资源的使用
Source: CVE Program / CVE List V5
Vulnerability Title
GNOME GVfs 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GNOME GVfs是GNOME基金会开源的一个虚拟文件系统。 GNOME GVfs存在资源管理错误漏洞，该漏洞源于read_string()函数分配缓冲区后未验证缓冲区是否完全填充，导致未初始化堆内容被用作文件句柄并回显给服务器，可能允许恶意SFTP服务器确定性地读取未初始化堆内存，泄露堆基址和libgio库加载地址，从而绕过地址空间布局随机化（ASLR）。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
GNOME gvfs 1.10.0 ~ 1.60.2 -
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-2026-84267

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III. Intelligence Information for CVE-2026-84267

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Vendor Advisories for CVE-2026-84267 (1)

Other References for CVE-2026-84267 (1)

Same Patch Batch · GNOME · 2026-09-01 · 4 CVEs total

CVE-2026-84268 8.8 HIGH Gvfs: sftp: heap-based buffer overflow in read_reply()
CVE-2026-84269 6.5 MEDIUM Gvfs: afp: heap-based buffer overflow in dsi read path
CVE-2026-84270 4.3 MEDIUM Gvfs: mtp: out-of-bounds read in do_read()

IV. Related Vulnerabilities

Same product: gvfs
Same vendor: GNOME
Same weakness: CWE-908

V. Comments for CVE-2026-84267

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