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

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, 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

CVSS 4.3 · Medium
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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

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-2026-84267

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III. Intelligence Information for CVE-2026-84267

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Other References for CVE-2026-84267 (3)

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

CVE-2026-84268 8.8 HIGH Gvfs: sftp: heap-based buffer overflow in read_reply()
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()

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-908

V. Comments for CVE-2026-84267

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