CVE-2026-84268
Gvfs: sftp: heap-based buffer overflow in read_reply()
- Published
- Updated
- Reserved
- Assigned by
- redhat
Description
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.
Timeline
ID reserved
By redhat
Published
- 2 months later
· 2 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| redhatCNA (assigner) | 3.1 | High8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVDNVD · Awaiting Analysis | 3.1 | High8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.62% · top 50% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.
Weakness
Affected products
- affected < 1.60.2
Red Hat · Red Hat Enterprise Linux 10
- unaffected 0:1.54.4-4.el10_2.1 – < *
Red Hat · Red Hat Enterprise Linux 10.0 Extended Update Support
- unaffected 0:1.54.4-2.el10_0.2 – < *
Red Hat · Red Hat Enterprise Linux 7 Extended Lifecycle Support
- unaffected 0:1.36.2-7.el7_9.1 – < *
Red Hat · Red Hat Enterprise Linux 8
- unaffected 0:1.36.2-22.el8_10 – < *
Red Hat · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
- unaffected 0:1.36.2-11.el8_4.1 – < *
Red Hat · Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
- unaffected 0:1.36.2-11.el8_4.1 – < *
Red Hat · Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
- unaffected 0:1.36.2-11.el8_6.1 – < *
Red Hat · Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
- unaffected 0:1.36.2-11.el8_6.1 – < *
Red Hat · Red Hat Enterprise Linux 8.8 Telecommunications Update Service
- unaffected 0:1.36.2-14.el8_8.1 – < *
Red Hat · Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
- unaffected 0:1.36.2-14.el8_8.1 – < *
Red Hat · Red Hat Enterprise Linux 9
- unaffected 0:1.48.1-8.el9_8.1 – < *
Red Hat · Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
- unaffected 0:1.48.1-4.el9_2.1 – < *
Red Hat · Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
- unaffected 0:1.48.1-4.el9_4.1 – < *
Red Hat · Red Hat Enterprise Linux 9.6 Extended Update Support
- unaffected 0:1.48.1-6.el9_6.1 – < *
Red Hat · Red Hat Enterprise Linux 6
All versions: unknown
What to do
Workaround: To mitigate this vulnerability, do not connect to untrusted SFTP servers.
References (14)
- RHSA-2026:73997 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:73998 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:74370 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:85939 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:85940 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:85941 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:85942 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:85943 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:85944 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:85945 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:86606 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-84268 (opens in a new tab)vdb-entryx_refsource_REDHAT
- RHBZ#2526485 (opens in a new tab)issue-trackingx_refsource_REDHAT
- https://gitlab.gnome.org/GNOME/gvfs/-/issues/862 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-84268)Record last updated .