Lua 5.3.5 has a use-after-free in lua_upvaluejoin in lapi.c.
Priority MEDIUM 50CWE-416Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 3 fixed, 1 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.
Summary
Lua 5.3.5 has a use-after-free in lua_upvaluejoin in lapi.c. For example, a crash outcome might be achieved by an attacker who is able to trigger a debug.upvaluejoin call in which the arguments have certain relationships.
Why it matters now
EPSS 0.1738 97th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix Partial Red Hat: 1 advisoryRed Hat: 3 fixed, 1 without a fix
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
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:lua:lua:5.3.5:*:*:*:*:*:*:* | 5.3.5 | Vulnerable | Lua |
| cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* | 16.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* | 18.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:* | 18.10 | Vulnerable | Canonical |
- cpe:2.3:a:lua:lua:5.3.5:*:*:*:*:*:*:* Versions 5.3.5 Vulnerable ·Lua
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* Versions 16.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:* Versions 18.10 Vulnerable ·Canonical
Remediation
Red Hat 1 advisory
- RHSA-2019:3706 Released 2019-11-05 · Red Hat rating Moderatelua security and bug fix update
- Red Hat CodeReady Linux Builder (v. 8) lua-5.3.4-11.el8, lua-devel-5.3.4-11.el8
- Red Hat Enterprise Linux AppStream (v. 8) lua-5.3.4-11.el8
- Red Hat Enterprise Linux BaseOS (v. 8) lua-5.3.4-11.el8, lua-libs-5.3.4-11.el8
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Ceph Storage 3 | Affected | No fix planned: Will not fix |
| Red Hat CodeReady Linux Builder (v. 8) | Fixed | RHSA-2019:3706 |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2019:3706 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2019:3706 |
Not affected: 3 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat JBoss Web Server 5
Timeline
- 2026-10-02 Threatist record created from CVE-2019-6706
- 2026-10-03 Alias added: GHSA-f6gj-vrmg-ccf7
References
Exploit 2
Sources
- CVE-2019-6706 · CVE Program
- CVE-2019-6706 · NVD
- FIRST EPSS
- GHSA-f6gj-vrmg-ccf7 · GitHub Advisory Database · CC BY 4.0
- CVE-2019-6706 · 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