Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 49.0…
Priority MEDIUM 49CWE-119Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.
Summary
Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 49.0 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unknown vectors.
Why it matters now
EPSS 0.0384 90th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Critical. Red Hat's page for this CVE →
Not affected: 3 products
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2016-5256
- 2026-10-03 Alias added: GHSA-6m4q-5fp8-jrhp
- 2026-10-19 EPSS moved to the 90th–95th percentile
References
Other 7
- https://bugzilla.mozilla.org/show_bug.cgi?id=1276413
- https://bugzilla.mozilla.org/show_bug.cgi?id=1268034
- https://bugzilla.mozilla.org/show_bug.cgi?id=1296078
- https://bugzilla.mozilla.org/show_bug.cgi?id=1297099
- https://bugzilla.mozilla.org/show_bug.cgi?id=1290244
- https://bugzilla.mozilla.org/show_bug.cgi?id=1296087
- https://bugzilla.mozilla.org/show_bug.cgi?id=1282746
More Mozilla Firefox vulnerabilities
- TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
- TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
- TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
- TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
- TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
- TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
Sources
- CVE-2016-5256 · CVE Program
- CVE-2016-5256 · NVD
- FIRST EPSS
- GHSA-6m4q-5fp8-jrhp · GitHub Advisory Database · CC BY 4.0
- CVE-2016-5256 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences