Quick answers
- Is CVE-2026-84267 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-84267 being exploited in the wild.
- How severe is CVE-2026-84267?
- Medium severity, with a CVSS score of 4.3, published 1 September 2026.
- Which products and versions are affected?
- Gnome Gvfs <unknown>.
- Is there a fix for CVE-2026-84267?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-84267 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-84267?
- Check whether you run Gnome Gvfs at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability exists in the SFTP backend of gvfs, specifically in the read_string() function handling FXP_HANDLE replies. When a server sends a short reply, the function allocates a buffer to the requested size but fails to verify the buffer is completely filled, leaving uninitialized heap contents in the remainder. An attacker controlling a malicious SFTP server can exploit this by sending a crafted 128-byte FXP_HANDLE reply where most bytes are uninitialized heap memory. The client echoes these bytes back on all subsequent requests, allowing the attacker to read the gvfsd-sftp process heap memory and leak the heap base and libgio load address. This deterministic information disclosure defeats ASLR protections. The attack requires the victim to mount a share on the attacker-controlled SFTP server.
Affected products
- GNOME gvfs <unknown>
Timeline
- 2026-09-01: disclosed: CVE-2026-84267 published