CVE-2026-76925

MEDIUMPre-NVD 5.85.8—
EchelonGraph scoreHIGH confidence

Score 5.8 from GitHub Security Advisory published 2026-09-05. a secondary CVSS source baseline 5.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.8Exploit: None knownExposed: 0

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

A flaw was found in Flatpak. A Time-of-check to time-of-use (TOCTOU) race condition exists in the org.freedesktop.Flatpak.SystemHelper component. This vulnerability occurs because a privileged chmod operation executes before the OSTree repository validation within the Deploy() function. An attacker can exploit this timing window to redirect symlinks to arbitrary files, potentially leading to unauthorized file manipulation or information disclosure.

CVSS v3
5.8
EG Score
5.8(high)
EG Risk
26(Track)
EG Risk 26/100SSVC: 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
Severity58% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
1%
KEV
Not listed

Published

September 4, 2026

Last Modified

September 8, 2026

Advisory Details (1)

Auto-updated Sep 4, 2026
No patch confirmed yet. Sources: redhat.
redhat

2520099 – (CVE-2026-76925) CVE-2026-76925 flatpak: Flatpak: TOCTOU race condition allows symlink redirection

https://bugzilla.redhat.com/show_bug.cgi?id=2520099

Vendor Advisories for CVE-2026-76925(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 43× 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. 2026-09-19 14:12 UTCEG score recompute
  2. 2026-09-19 14:12 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 12:32 UTCEG score recompute
  5. 2026-09-18 12:32 UTCGHSA enrichment
  6. 2026-09-17 10:53 UTCEG score recompute
  7. 2026-09-17 10:53 UTCGHSA enrichment
  8. 2026-09-16 14:08 UTCEPSS rescore
  9. 2026-09-16 09:14 UTCEG score recompute
  10. 2026-09-16 09:14 UTCGHSA enrichment
  11. 2026-09-16 05:15 UTCEPSS rescore
  12. 2026-09-15 07:35 UTCEG score recompute
  13. 2026-09-15 07:35 UTCGHSA enrichment
  14. 2026-09-15 03:12 UTCEPSS rescore
  15. 2026-09-14 05:56 UTCEG score recompute
  16. 2026-09-14 05:56 UTCGHSA enrichment
  17. 2026-09-13 04:18 UTCEG score recompute
  18. 2026-09-13 04:18 UTCGHSA enrichment
  19. 2026-09-12 15:02 UTCEPSS rescore
  20. 2026-09-12 02:39 UTCEG score recompute
  21. 2026-09-12 02:39 UTCGHSA enrichment
  22. 2026-09-11 14:53 UTCEPSS rescore
  23. 2026-09-11 01:00 UTCEG score recompute
  24. 2026-09-11 01:00 UTCGHSA enrichment
  25. 2026-09-10 09:35 UTCEPSS rescore
Show 18 more
  1. 2026-09-09 23:21 UTCEG score recompute
  2. 2026-09-09 23:21 UTCGHSA enrichment
  3. 2026-09-08 22:01 UTCEPSS rescore
  4. 2026-09-08 19:56 UTCGHSA enrichment
  5. 2026-09-08 14:16 UTCEG score recompute
  6. 2026-09-08 14:16 UTCGHSA enrichment
  7. 2026-09-08 13:07 UTCEG score recompute
  8. 2026-09-08 13:07 UTCGHSA enrichment
  9. 2026-09-08 03:36 UTCEG score recompute
  10. 2026-09-08 03:36 UTCGHSA enrichment
  11. 2026-09-07 01:56 UTCEG score recompute
  12. 2026-09-07 01:56 UTCGHSA enrichment
  13. 2026-09-06 13:48 UTCEPSS rescore
  14. 2026-09-06 00:13 UTCEG score recompute
  15. 2026-09-06 00:13 UTCGHSA enrichment
  16. 2026-09-04 22:31 UTCEG score recompute
  17. 2026-09-04 21:20 UTCEG score recompute
  18. 2026-09-04 21:19 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-76925?
CVE-2026-76925 is a medium vulnerability published on September 4, 2026. A flaw was found in Flatpak. A Time-of-check to time-of-use (TOCTOU) race condition exists in the org.freedesktop.Flatpak.SystemHelper component. This vulnerability occurs because a privileged chmod operation executes before the OSTree repository validation within the Deploy() function. An attacker…
When was CVE-2026-76925 disclosed?
CVE-2026-76925 was first published in the National Vulnerability Database on September 4, 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-2026-76925 actively exploited?
CVE-2026-76925 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 99.1% of all scored CVEs.
What is the CVSS score of CVE-2026-76925?
CVE-2026-76925 has a CVSS v3 base score of 5.8 (NVD).
How do I remediate CVE-2026-76925?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-76925, 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

Explore the affected products and dependency analysis for CVE-2026-76925

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