CVE-2026-74977
published 2026-08-18CVE-2026-74977: Integer overflow in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
PriorityP338high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.35%
28.2th percentile
Integer overflow in the Graphics 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
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vendor_redhat7.5HIGH
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Red Hat
firefox: thunderbird: Integer overflow in the Graphics component
vendor_redhat·2026-08-18·CVSS 7.5
CVE-2026-74977 [HIGH] CWE-190 firefox: thunderbird: Integer overflow in the Graphics component
firefox: thunderbird: Integer overflow in the Graphics component
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Integer overflow in the Graphics 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: firefox (Red Hat Enterprise Linux 6) - Not affected
Package: firefox (Red Hat Enterprise Linux 7) - Not affected
Package: firefox (Red Hat Enterprise Linux 8) - Not affected
Package: firefox (Red Hat Enterprise Linux 9) - Not affected
Mozilla
Mozilla Foundation Security Advisory 2026-78: CVE-2026-74977
vendor_mozilla
CVE-2026-74977 Mozilla Foundation Security Advisory 2026-78: CVE-2026-74977
Mozilla Foundation Security Advisory 2026-78
CVE: CVE-2026-74977
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 154
Mozilla
Mozilla Foundation Security Advisory 2026-77: CVE-2026-74977
vendor_mozilla
CVE-2026-74977 Mozilla Foundation Security Advisory 2026-77: CVE-2026-74977
Mozilla Foundation Security Advisory 2026-77
CVE: CVE-2026-74977
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 153.1
Mozilla
Mozilla Foundation Security Advisory 2026-74: CVE-2026-74977
vendor_mozilla
CVE-2026-74977 Mozilla Foundation Security Advisory 2026-74: CVE-2026-74977
Mozilla Foundation Security Advisory 2026-74
CVE: CVE-2026-74977
Product: Firefox
Impact: high
Fixed in: Firefox 154
Mozilla
Mozilla Foundation Security Advisory 2026-80: CVE-2026-74977
vendor_mozilla
CVE-2026-74977 Mozilla Foundation Security Advisory 2026-80: CVE-2026-74977
Mozilla Foundation Security Advisory 2026-80
CVE: CVE-2026-74977
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 153.1
GHSA
Integer overflow in the Graphics component.
ghsa_unreviewed·2026-08-18
CVE-2026-74977 [HIGH] CWE-190 Integer overflow in the Graphics component.
Integer overflow in the Graphics component. This vulnerability was fixed in Firefox 154 and Firefox ESR 153.1.
No detection rules found.
No public exploits indexed.
2026-08-18
Published