CVE-2026-84267
published 2026-09-01CVE-2026-84267: 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…
PriorityP423medium4.3CVSS 3.1
AVNACLPRNUIRSUCLINAN
EPSS
0.37%
29.1th percentile
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).
Affected
1 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| gnome | gvfs | >= 1.10.0 < 1.60.2 | 1.60.2 |
CVSS provenance
nvdv3.14.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
vendor_redhat4.3MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
GHSA
A flaw was found in the SFTP backend in gvfs.
ghsa_unreviewed·2026-09-01
CVE-2026-84267 [MEDIUM] CWE-908 A flaw was found in the SFTP backend in gvfs.
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
Red Hat
gvfs: SFTP: uninitialized heap disclosure in read_string()
vendor_redhat·2026-08-03·CVSS 4.3
CVE-2026-84267 [MEDIUM] CWE-908 gvfs: SFTP: uninitialized heap disclosure in read_string()
gvfs: SFTP: uninitialized heap disclosure in read_string()
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,
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-84267 gvfs: SFTP: uninitialized heap disclosure in read_string() [fedora-all]
bugzilla·2026-09-01·CVSS 4.3
CVE-2026-84267 [MEDIUM] CVE-2026-84267 gvfs: SFTP: uninitialized heap disclosure in read_string() [fedora-all]
CVE-2026-84267 gvfs: SFTP: uninitialized heap disclosure in read_string() [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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
Bugzilla
CVE-2026-84267 gvfs: SFTP: uninitialized heap disclosure in read_string()
bugzilla·2026-08-31·CVSS 4.3
CVE-2026-84267 [MEDIUM] CVE-2026-84267 gvfs: SFTP: uninitialized heap disclosure in read_string()
CVE-2026-84267 gvfs: SFTP: uninitialized heap disclosure in read_string()
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 l
2026-09-01
Published