CVE-2026-86469

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-09-07. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: 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 GLib2. When g_file_replace() is used with G_FILE_CREATE_REPLACE_DESTINATION and creating the .goutputstream-XXXXXX temporary file fails, the library unlinks the destination and recreates it without exclusive creation or symlink protection. A local attacker who can write to the destination directory can win that race and redirect the write to another file.

CVSS v3
5.3
EG Score
5.3(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity53% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

September 7, 2026

Last Modified

September 8, 2026

Advisory Details (4)

Auto-updated Sep 7, 2026
🔬 Proof of concept available. Patch available. Sources: redhat.
generic🟡 PoC Available

(#YWH-PGM9867-289) TOCTOU on GLib through g_file_replace() in gio/glocalfileoutputstream.c via G_FILE_CREATE_REPLACE_DESTINATION leads to Arbitrary File Overwrite (#4044) · Issues · GNOME / GLib · GitLab

https://gitlab.gnome.org/GNOME/glib/-/work_items/4044
generic

Client Challenge

https://gitlab.gnome.org/GNOME/glib/-/blob/main/gio/glocalfileoutputstream.c
redhat

2473839 – (CVE-2026-86469) CVE-2026-86469 glib2: TOCTOU Symlink Race in `G_FILE_CREATE_REPLACE_DESTINATION` Fallback Path

https://bugzilla.redhat.com/show_bug.cgi?id=2473839
redhat Patch Available

CVE-2026-86469 - 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-2026-86469

Vendor Advisories for CVE-2026-86469(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
glib2.02.74.6-2 ... 2.89.4-2 (146 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
glib2.02.84.3-1 ... 2.89.4-2 (49 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
glib2.02.84.3-1 ... 2.89.4-2 (49 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 38× 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 08:07 UTCEG score recompute
  2. 2026-09-20 08:07 UTCGHSA enrichment
  3. 2026-09-19 07:08 UTCEG score recompute
  4. 2026-09-19 07:08 UTCGHSA enrichment
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-18 06:14 UTCEG score recompute
  7. 2026-09-18 06:14 UTCGHSA enrichment
  8. 2026-09-17 19:32 UTCEPSS rescore
  9. 2026-09-17 05:22 UTCEG score recompute
  10. 2026-09-17 05:22 UTCGHSA enrichment
  11. 2026-09-16 14:09 UTCEPSS rescore
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-16 04:30 UTCGHSA enrichment
  14. 2026-09-15 03:38 UTCEG score recompute
  15. 2026-09-15 03:38 UTCGHSA enrichment
  16. 2026-09-15 03:12 UTCEPSS rescore
  17. 2026-09-15 03:12 UTCEPSS rescore
  18. 2026-09-14 02:46 UTCEG score recompute
  19. 2026-09-14 02:46 UTCGHSA enrichment
  20. 2026-09-13 01:54 UTCEG score recompute
  21. 2026-09-13 01:54 UTCGHSA enrichment
  22. 2026-09-12 01:02 UTCEG score recompute
  23. 2026-09-12 01:02 UTCGHSA enrichment
  24. 2026-09-11 14:53 UTCEPSS rescore
  25. 2026-09-11 14:53 UTCEPSS rescore
Show 13 more
  1. 2026-09-11 00:10 UTCEG score recompute
  2. 2026-09-11 00:09 UTCGHSA enrichment
  3. 2026-09-09 23:18 UTCEG score recompute
  4. 2026-09-09 23:17 UTCGHSA enrichment
  5. 2026-09-08 22:01 UTCEPSS rescore
  6. 2026-09-08 19:51 UTCGHSA enrichment
  7. 2026-09-08 13:45 UTCEG score recompute
  8. 2026-09-08 13:44 UTCGHSA enrichment
  9. 2026-09-08 13:01 UTCEG score recompute
  10. 2026-09-08 13:01 UTCGHSA enrichment
  11. 2026-09-07 16:28 UTCEG score recompute
  12. 2026-09-07 16:06 UTCEG score recompute
  13. 2026-09-07 16:05 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-86469?
CVE-2026-86469 is a medium vulnerability published on September 7, 2026. A flaw was found in GLib2. When gfilereplace() is used with GFILECREATEREPLACEDESTINATION and creating the .goutputstream-XXXXXX temporary file fails, the library unlinks the destination and recreates it without exclusive creation or symlink protection. A local attacker who can write to the…
When was CVE-2026-86469 disclosed?
CVE-2026-86469 was first published in the National Vulnerability Database on September 7, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86469 actively exploited?
CVE-2026-86469 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 98.4% of all scored CVEs.
What is the CVSS score of CVE-2026-86469?
CVE-2026-86469 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-86469?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86469, 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-2026-86469

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