Memory corruption in Mozilla Firefox
Priority MEDIUM 46CWE-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
- Fixed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.
Summary
Memory safety bugs were reported in Firefox 58. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Firefox < 59.
Why it matters now
EPSS 0.01768 78th percentileScored 2026-11-07
Fix Fixed Firefox (Mozilla): 59
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 |
|---|---|---|---|---|---|
| Mozilla | Firefox | before 59 | 59 | Patch available | CNA |
- Firefox VendorMozilla Affected before 59 Fixed in 59 Patch available CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* | before 59.0 | Vulnerable | Mozilla |
| cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* | 14.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* | 16.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:* | 17.10 | Vulnerable | Canonical |
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 59.0 Vulnerable ·Mozilla
- cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* Versions 14.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* Versions 16.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:* Versions 17.10 Vulnerable ·Canonical
Remediation
- Fix · CNA Firefox (Mozilla) Fixed in 59
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Advisory ·
Mozilla Firefox — USN-3596-1
17 records Highest priority Priority MEDIUM 6 MEDIUM, 11 LOW
Other records, highest priority first
- TI-2018-03693 Memory corruption in Mozilla ThunderbirdPriority MEDIUM 49
- TI-2018-03694 Use after free in Mozilla FirefoxPriority MEDIUM 46
- TI-2018-03696 Improper input validation in Mozilla Firefox ESRPriority MEDIUM 43
Timeline
- 2026-10-02 Threatist record created from CVE-2018-5126
- 2026-10-03 Alias added: GHSA-8f39-w2xj-cv9f
References
Advisory 3
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1433671%2C1414768%2C1416523%2C1425691%2C1441006%2C1429768%2C1426002%2C1297740%2C1435566%2C1432855%2C1442318%2C1421963%2C1422631%2C1426603%2C1404297%2C1425257%2C1373934%2C1423173%2C1416940
- USN-3596-1
- https://www.mozilla.org/security/advisories/mfsa2018-06/
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-2018-5126 · CVE Program
- CVE-2018-5126 · NVD
- FIRST EPSS
- GHSA-8f39-w2xj-cv9f · GitHub Advisory Database · CC BY 4.0
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