CVE-2026-74984
published 2026-08-18CVE-2026-74984: Race condition in the JavaScript Engine component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
PriorityP333medium6.8CVSS 3.1
AVNACHPRNUIRSUCHIHAN
EPSS
0.19%
8.3th percentile
Race condition in the JavaScript Engine component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 154 | Firefox 154 |
| mozilla | firefox | < 153.1.0 | 153.1.0 |
| mozilla | firefox_esr | < Firefox ESR 153.1 | Firefox ESR 153.1 |
| mozilla | thunderbird | < Thunderbird 154 | Thunderbird 154 |
| mozilla | thunderbird | < Thunderbird 153.1 | Thunderbird 153.1 |
| mozilla | thunderbird | < 153.1.0 | 153.1.0 |
CVSS provenance
nvdv3.16.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
vendor_redhat6.8MEDIUM
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GHSA
Race condition in the JavaScript Engine component.
ghsa_unreviewed·2026-08-18
CVE-2026-74984 Race condition in the JavaScript Engine component.
Race condition in the JavaScript Engine component. This vulnerability was fixed in Firefox 154 and Firefox ESR 153.1.
Red Hat
firefox: thunderbird: Race condition in the JavaScript Engine component
vendor_redhat·2026-08-18·CVSS 6.8
CVE-2026-74984 [MEDIUM] CWE-366 firefox: thunderbird: Race condition in the JavaScript Engine component
firefox: thunderbird: Race condition in the JavaScript Engine component
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Race condition in the JavaScript Engine 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) - Not affected
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Not affected
Package: rhel10/thunderbird-flatpak (Red Hat Enterprise Linux 10) - Not affected
Package: thunderbird (Red Hat Enterprise Linux 10) - Not affected
Package: firefox (Red Hat Enterprise Linux 6) - Not affected
Package: thunderbird (Red Hat Enterprise Linux 6) - Not affected
Package: fi
Mozilla
Mozilla Foundation Security Advisory 2026-77: CVE-2026-74984
vendor_mozilla
CVE-2026-74984 Mozilla Foundation Security Advisory 2026-77: CVE-2026-74984
Mozilla Foundation Security Advisory 2026-77
CVE: CVE-2026-74984
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 153.1
Mozilla
Mozilla Foundation Security Advisory 2026-78: CVE-2026-74984
vendor_mozilla
CVE-2026-74984 Mozilla Foundation Security Advisory 2026-78: CVE-2026-74984
Mozilla Foundation Security Advisory 2026-78
CVE: CVE-2026-74984
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 154
Mozilla
Mozilla Foundation Security Advisory 2026-80: CVE-2026-74984
vendor_mozilla
CVE-2026-74984 Mozilla Foundation Security Advisory 2026-80: CVE-2026-74984
Mozilla Foundation Security Advisory 2026-80
CVE: CVE-2026-74984
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 153.1
Mozilla
Mozilla Foundation Security Advisory 2026-74: CVE-2026-74984
vendor_mozilla
CVE-2026-74984 Mozilla Foundation Security Advisory 2026-74: CVE-2026-74984
Mozilla Foundation Security Advisory 2026-74
CVE: CVE-2026-74984
Product: Firefox
Impact: high
Fixed in: Firefox 154
No detection rules found.
No public exploits indexed.
2026-08-18
Published