CVE-2026-78376

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-24. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: 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 WebKitGTK. Processing malicious web content can cause a use-after-free issue due to improper memory handling and result in memory corruption.

CVSS v3
8.8
EG Score
8.8(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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
20%
KEV
Not listed

Published

August 24, 2026

Last Modified

August 28, 2026

Advisory Details (2)

Auto-updated Aug 24, 2026
Patch available. Sources: redhat.
redhat

2521858 – (CVE-2026-78376) CVE-2026-78376 webkitgtk: use-after-free of JSCValue function parameters

https://bugzilla.redhat.com/show_bug.cgi?id=2521858
redhat Patch Available

CVE-2026-78376 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 7, the following packages require WebKitGTK4: evolution-data-server, glade, gnome-boxes, gnome-initia

https://access.redhat.com/security/cve/CVE-2026-78376

Vendor Advisories for CVE-2026-78376(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 29× in last 7d / 29× 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. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-29 23:47 UTCGHSA enrichment
  3. 2026-08-29 10:45 UTCGHSA enrichment
  4. 2026-08-28 21:42 UTCEG score recompute
  5. 2026-08-28 21:42 UTCGHSA enrichment
  6. 2026-08-28 21:42 UTCEPSS rescore
  7. 2026-08-28 07:41 UTCGHSA enrichment
  8. 2026-08-27 18:32 UTCGHSA enrichment
  9. 2026-08-27 05:29 UTCGHSA enrichment
  10. 2026-08-26 16:25 UTCEG score recompute
  11. 2026-08-26 16:25 UTCGHSA enrichment
  12. 2026-08-26 14:47 UTCEPSS rescore
  13. 2026-08-26 03:23 UTCGHSA enrichment
  14. 2026-08-25 14:21 UTCEG score recompute
  15. 2026-08-25 14:21 UTCGHSA enrichment
  16. 2026-08-25 14:00 UTCEG score recompute
  17. 2026-08-25 14:00 UTCGHSA enrichment
  18. 2026-08-25 13:49 UTCEPSS rescore
  19. 2026-08-25 04:23 UTCEG score recompute
  20. 2026-08-25 04:23 UTCGHSA enrichment
  21. 2026-08-25 04:10 UTCEG score recompute
  22. 2026-08-25 04:10 UTCGHSA enrichment
  23. 2026-08-24 18:23 UTCEG score recompute
  24. 2026-08-24 18:22 UTCGHSA enrichment
  25. 2026-08-24 15:23 UTCEG score recompute
Show 4 more
  1. 2026-08-24 14:56 UTCEG score recompute
  2. 2026-08-24 14:24 UTCEG score recompute
  3. 2026-08-24 13:43 UTCEG score recompute
  4. 2026-08-24 13:42 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-78376?
CVE-2026-78376 is a high vulnerability published on August 24, 2026. A flaw was found in WebKitGTK. Processing malicious web content can cause a use-after-free issue due to improper memory handling and result in memory corruption.
When was CVE-2026-78376 disclosed?
CVE-2026-78376 was first published in the National Vulnerability Database on August 24, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78376 actively exploited?
CVE-2026-78376 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 80.4% of all scored CVEs.
What is the CVSS score of CVE-2026-78376?
CVE-2026-78376 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-78376?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78376, 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-2026-78376

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