Other issue in the JavaScript Engine component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.
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Score 5.3 from GitHub Security Advisory published 2026-05-12. NVD baseline CVSS 5.3; sources differ by 0.0.
Other issue in the JavaScript Engine component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.
May 12, 2026
May 19, 2026
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Red Hat Security Advisory: thunderbird security update
Red Hat Security Advisory: firefox security update
Red Hat Security Advisory: thunderbird security update
Red Hat Security Advisory: firefox security update
Red Hat Security Advisory: firefox security update
Other issue in the JavaScript Engine component. This vulnerability was fixed in Firefox 150.0.3.
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| redhat | thunderbird-0:140.11.0-1.el10_2 | 2026-06-01 | redhat |
| redhat | firefox-0:140.11.0-1.el10_2 | 2026-05-27 | redhat |
| redhat | firefox-0:140.11.0-1.el8_10 | 2026-05-27 | redhat |
| redhat | firefox-0:140.11.0-1.el9_8 | 2026-05-27 | redhat |
| redhat | thunderbird-0:140.11.0-1.el9_8 | 2026-05-27 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-8391
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CWE-20 · CWE-119 · CWE-79