--- id: CVE-2026-84268 title: A flaw was found in the SFTP backend in gvfs summary: >- 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 se… severity: high cvss: 8.8 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H' cwe: - CWE-122 vendor: GNOME product: gvfs affected: - gvfs < 1.60.2 - gvfs (all versions) - gvfs (all versions) - gvfs (all versions) - gvfs (all versions) - gvfs (all versions) patched: - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_8 - enterprise_linux_crb_v_8 published: '2026-09-01' updated: '2026-10-01' sourceUpdated: '2026-10-01T17:17:32.270' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-84268' references: - url: 'https://access.redhat.com/errata/RHSA-2026:73997' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:73998' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:74370' label: secalert@redhat.com - url: 'https://access.redhat.com/security/cve/CVE-2026-84268' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2526485' label: secalert@redhat.com - url: 'https://gitlab.gnome.org/GNOME/gvfs/-/issues/862' label: secalert@redhat.com - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84268.json - url: 'https://www.cve.org/CVERecord?id=CVE-2026-84268' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-84268' - url: 'https://access.redhat.com/errata/RHSA-2026:85940' label: 'RHSA-2026:85940' - url: 'https://access.redhat.com/errata/RHSA-2026:85942' label: 'RHSA-2026:85942' - url: 'https://access.redhat.com/errata/RHSA-2026:85943' label: 'RHSA-2026:85943' - url: 'https://access.redhat.com/errata/RHSA-2026:85941' label: 'RHSA-2026:85941' - url: 'https://access.redhat.com/errata/RHSA-2026:85944' label: 'RHSA-2026:85944' - url: 'https://access.redhat.com/errata/RHSA-2026:85945' label: 'RHSA-2026:85945' - url: 'https://access.redhat.com/errata/RHSA-2026:85939' label: 'RHSA-2026:85939' - url: 'https://access.redhat.com/errata/RHSA-2026:86606' label: 'RHSA-2026:86606' tags: - nvd - cve.org - csaf - vex - red-hat ssvc: exploitation: none automatable: 'no' technicalImpact: total timestamp: '2026-09-01T18:01:43.116734Z' epss: 0.00622 epssPercentile: 0.49631 ingestedAt: '2026-09-30T23:29:32.576Z' --- ## Overview 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. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **RHSA-2026:73998** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-09-30 · [advisory](https://access.redhat.com/errata/RHSA-2026:73998) - **RHSA-2026:73997** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-09-30 · [advisory](https://access.redhat.com/errata/RHSA-2026:73997) - **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-10-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84268.json) - **RHSA-2026:74370** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-10-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:74370) - **RHSA-2026:86606** · Red Hat · fixed in: Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux Server Optional (v. 7 ELS) · released 2026-10-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:86606) - **RHSA-2026:85941** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:85941) - **RHSA-2026:85945** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:85945) - **RHSA-2026:85943** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:85943) - **RHSA-2026:85940** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:85940) - **RHSA-2026:85942** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:85942) - **RHSA-2026:85944** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:85944) - **RHSA-2026:85939** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat CodeReady Linux Builder EUS (v.9.6) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:85939)