CVE-2026-12330
published 2026-06-16CVE-2026-12330: Incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 140.12, Firefox ESR 115.37, and Thunderbird…
PriorityP425medium5.4CVSS 3.1
AVNACLPRNUIRSUCLILAN
EPSS
0.16%
6.0th percentile
Incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 140.12, Firefox ESR 115.37, and Thunderbird 140.12.
Affected
10 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < 115.37.0 | 115.37.0 |
| mozilla | firefox | — | — |
| mozilla | firefox | >= 140.0 < 140.12.0 | 140.12.0 |
| mozilla | firefox_esr | < Firefox ESR 115.37 | Firefox ESR 115.37 |
| mozilla | firefox_esr | < Firefox ESR 140.12 | Firefox ESR 140.12 |
| mozilla | thunderbird | < Thunderbird 140.12 | Thunderbird 140.12 |
| mozilla | thunderbird | — | — |
| mozilla | thunderbird | >= 140.0 < 140.12.0 | 140.12.0 |
| rhel10 | firefox-flatpak | — | — |
| rhel10 | thunderbird-flatpak | — | — |
CVSS provenance
nvdv3.15.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
vendor_redhat5.4MEDIUM
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Red Hat
firefox: thunderbird: Incorrect boundary conditions in the Internationalization component
vendor_redhat·2026-06-16·CVSS 5.4
CVE-2026-12330 [MEDIUM] CWE-131 firefox: thunderbird: Incorrect boundary conditions in the Internationalization component
firefox: thunderbird: Incorrect boundary conditions in the Internationalization component
Incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 140.12, Firefox ESR 115.37, and Thunderbird 140.12.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Incorrect boundary conditions in the Internationalization component
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Package: firefox (Red Hat Enterprise Linux 10) - Affected
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: rhel10/thunderbird-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: thunder
Mozilla
Mozilla Foundation Security Advisory 2026-59: CVE-2026-12330
vendor_mozilla·CVSS 5.4
CVE-2026-12330 [MEDIUM] Mozilla Foundation Security Advisory 2026-59: CVE-2026-12330
Mozilla Foundation Security Advisory 2026-59
CVE: CVE-2026-12330
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 115.37
Mozilla
Mozilla Foundation Security Advisory 2026-58: CVE-2026-12330
vendor_mozilla·CVSS 5.4
CVE-2026-12330 [MEDIUM] Mozilla Foundation Security Advisory 2026-58: CVE-2026-12330
Mozilla Foundation Security Advisory 2026-58
CVE: CVE-2026-12330
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 140.12
Mozilla
Mozilla Foundation Security Advisory 2026-61: CVE-2026-12330
vendor_mozilla·CVSS 5.4
CVE-2026-12330 [MEDIUM] Mozilla Foundation Security Advisory 2026-61: CVE-2026-12330
Mozilla Foundation Security Advisory 2026-61
CVE: CVE-2026-12330
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140.12
GHSA
Incorrect boundary conditions in the Internationalization component.
ghsa_unreviewed·2026-06-16
CVE-2026-12330 [MEDIUM] CWE-119 Incorrect boundary conditions in the Internationalization component.
Incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 140.12 and Firefox ESR 115.37.
No detection rules found.
No public exploits indexed.
2026-06-16
Published