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CVE-2026-8391

5.3 MEDIUM

Other issue in the JavaScript Engine component

Published: 2026-05-12 · Last updated: 2026-05-19

Severity and scoring

CVSS
5.3 MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
CWE-119, CWE-20, CWE-79

Affected products

VendorProduct
mozillafirefox

Description

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.

Source: NVD

References

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  • CVE-2026-12330 — Incorrect boundary conditions in the Internationalization component (5.4 MEDIUM)
  • CVE-2026-12329 — Memory safety bug fixed in Thunderbird ESR 140.12 (5.3 MEDIUM)
  • CVE-2026-12327 — Memory safety bugs present in Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151 (7.3 HIGH)