CVE-2026-84267

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreHIGH confidence

Score 4.3 from GitHub Security Advisory published 2026-09-01. a secondary CVSS source baseline 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.3Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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).

CVSS v3
4.3
EG Score
4.3(high)
EG Risk
35(Track)
EG Risk 35/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity43% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
12%
KEV
Not listed

Published

September 1, 2026

Last Modified

September 2, 2026

Advisory Details (3)

Auto-updated Sep 1, 2026
Patch available. Sources: redhat.
generic

gvfs SFTP backend: uninitialised heap disclosure in read_string() (info leak / ASLR defeat) (#861) · Issues · GNOME / gvfs · GitLab

https://gitlab.gnome.org/GNOME/gvfs/-/issues/861
redhat

Bug Access Denied

https://bugzilla.redhat.com/show_bug.cgi?id=2526466
redhat Patch Available

CVE-2026-84267 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-84267

Vendor Advisories for CVE-2026-84267(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
gvfs1.50.3-1 ... 1.60.0-2 (39 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
gvfs1.57.2-2 ... 1.60.0-2 (11 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
gvfs1.57.2-2 ... 1.60.0-2 (10 versions)——

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 21× in last 7d / 60× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-20 03:02 UTCEG score recompute
  2. 2026-09-20 03:01 UTCGHSA enrichment
  3. 2026-09-19 04:57 UTCEG score recompute
  4. 2026-09-19 04:57 UTCGHSA enrichment
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-18 06:53 UTCEG score recompute
  7. 2026-09-18 06:53 UTCGHSA enrichment
  8. 2026-09-17 19:32 UTCEPSS rescore
  9. 2026-09-17 08:49 UTCEG score recompute
  10. 2026-09-17 08:49 UTCGHSA enrichment
  11. 2026-09-16 14:09 UTCEPSS rescore
  12. 2026-09-16 10:44 UTCEG score recompute
  13. 2026-09-16 10:44 UTCGHSA enrichment
  14. 2026-09-16 05:15 UTCEPSS rescore
  15. 2026-09-15 12:28 UTCEG score recompute
  16. 2026-09-15 12:28 UTCGHSA enrichment
  17. 2026-09-15 03:12 UTCEPSS rescore
  18. 2026-09-15 03:12 UTCEPSS rescore
  19. 2026-09-14 14:23 UTCEG score recompute
  20. 2026-09-14 14:23 UTCGHSA enrichment
  21. 2026-09-13 16:19 UTCGHSA enrichment
  22. 2026-09-12 18:15 UTCEG score recompute
  23. 2026-09-12 18:15 UTCGHSA enrichment
  24. 2026-09-11 20:10 UTCEG score recompute
  25. 2026-09-11 20:10 UTCGHSA enrichment
Show 35 more
  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-11 14:53 UTCEPSS rescore
  3. 2026-09-10 21:41 UTCEG score recompute
  4. 2026-09-10 21:41 UTCGHSA enrichment
  5. 2026-09-09 23:37 UTCGHSA enrichment
  6. 2026-09-09 00:24 UTCEG score recompute
  7. 2026-09-09 00:24 UTCGHSA enrichment
  8. 2026-09-08 22:01 UTCEPSS rescore
  9. 2026-09-08 02:10 UTCEG score recompute
  10. 2026-09-08 02:09 UTCGHSA enrichment
  11. 2026-09-07 04:05 UTCEG score recompute
  12. 2026-09-07 04:05 UTCGHSA enrichment
  13. 2026-09-06 13:48 UTCEPSS rescore
  14. 2026-09-06 05:59 UTCEG score recompute
  15. 2026-09-06 05:59 UTCGHSA enrichment
  16. 2026-09-05 15:31 UTCEPSS rescore
  17. 2026-09-05 07:54 UTCEG score recompute
  18. 2026-09-05 07:54 UTCGHSA enrichment
  19. 2026-09-04 09:49 UTCEG score recompute
  20. 2026-09-04 09:49 UTCGHSA enrichment
  21. 2026-09-04 05:07 UTCEPSS rescore
  22. 2026-09-03 11:45 UTCEG score recompute
  23. 2026-09-03 11:45 UTCGHSA enrichment
  24. 2026-09-02 14:12 UTCEPSS rescore
  25. 2026-09-02 13:35 UTCEG score recompute
  26. 2026-09-02 13:34 UTCGHSA enrichment
  27. 2026-09-02 13:16 UTCEG score recompute
  28. 2026-09-02 13:16 UTCGHSA enrichment
  29. 2026-09-01 21:08 UTCEG score recompute
  30. 2026-09-01 21:08 UTCGHSA enrichment
  31. 2026-09-01 17:42 UTCEG score recompute
  32. 2026-09-01 16:25 UTCEG score recompute
  33. 2026-09-01 16:09 UTCEG score recompute
  34. 2026-09-01 15:43 UTCEG score recompute
  35. 2026-09-01 15:42 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-84267?
CVE-2026-84267 is a medium vulnerability published on September 1, 2026. A flaw was found in the SFTP backend in gvfs. When mounting a share, a malicious SFTP server can cause readstring() 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…
When was CVE-2026-84267 disclosed?
CVE-2026-84267 was first published in the National Vulnerability Database on September 1, 2026, with the most recent update on September 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-84267 actively exploited?
CVE-2026-84267 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 88.1% of all scored CVEs.
What is the CVSS score of CVE-2026-84267?
CVE-2026-84267 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-84267?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-84267, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-84267

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