Buffer overflow in Mozilla Firefox
CVE-2026-7320
Information disclosure due to incorrect boundary conditions in the Audio/Video component. This vulnerability was fixed in Firefox 150.0.1, Firefox ESR 140.10.1, Firefox ESR 115.35.1, Thunderbird 150.0.1, and Thunderbird 140.10.1.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.006 (46.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.003
Affected products
- Mozilla Firefox — versions 115.35.1, 140.10.1, 150.0.1
- Mozilla Thunderbird — versions 140.10.1, 150.0.1
Weakness classification (CWE)
References
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required)
- www.mozilla.org/security/advisories/mfsa2026-35/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2026-36/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2026-37/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2026-38/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2026-39/ (Vendor Advisory)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-7320?
- CVE-2026-7320 is a high-severity vulnerability in Mozilla Firefox, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.5/10. Published 2026-04-28.
- How severe is CVE-2026-7320?
- High severity. CVSS v3 base score is 7.5 out of 10.