LZ4 before 1.9.2 has a heap-based buffer overflow in LZ4_write32 (related to…
Priority MEDIUM 56CWE-787Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 1 fixed, 2 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.
Summary
LZ4 before 1.9.2 has a heap-based buffer overflow in LZ4_write32 (related to LZ4_compress_destSize), affecting applications that call LZ4_compress_fast with a large input. (This issue can also lead to data corruption.) NOTE: the vendor states "only a few specific / uncommon usages of the API are at risk."
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.10451 95th percentileScored 2026-11-07
Fix Partial Red Hat: 1 advisoryRed Hat: 1 fixed, 2 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
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 · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:lz4_project:lz4:*:*:*:*:*:*:*:* | before 1.9.2 | Vulnerable | Lz4 Project |
- cpe:2.3:a:lz4_project:lz4:*:*:*:*:*:*:*:* Versions before 1.9.2 Vulnerable ·Lz4 Project
Remediation
Red Hat 1 advisory
- RHSA-2025:11035 Released 2025-07-15 · Red Hat rating Moderatelz4 security update
- Red Hat Enterprise Linux BaseOS (v. 8) lz4-1.8.3-5.el8_10, lz4-devel-1.8.3-5.el8_10, lz4-libs-1.8.3-5.el8_10
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Will not fix |
| Red Hat OpenStack Platform 10 (Newton) | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2025:11035 |
Timeline
- 2026-10-02 Threatist record created from CVE-2019-17543
- 2026-10-03 Alias added: GHSA-fxrv-74g3-w7qr
- 2026-10-08 CISA SSVC decision points changed
References
Advisory 5
Other 12
- [arrow-issues] 20191024 [jira] [Created] (ARROW-6984) Update LZ4 to 1.9.2 for CVE-2019-17543
- [arrow-dev] 20191024 [jira] [Created] (ARROW-6984) Update LZ4 to 1.9.2 for CVE-2019-17543
- [arrow-issues] 20191024 [jira] [Updated] (ARROW-6984) [C++] Update LZ4 to 1.9.2 for CVE-2019-17543
- [arrow-issues] 20191024 [jira] [Assigned] (ARROW-6984) [C++] Update LZ4 to 1.9.2 for CVE-2019-17543
- [arrow-issues] 20191025 [jira] [Commented] (ARROW-6984) [C++] Update LZ4 to 1.9.2 for CVE-2019-17543
- [arrow-issues] 20191106 [jira] [Resolved] (ARROW-6984) [C++] Update LZ4 to 1.9.2 for CVE-2019-17543
- [kudu-issues] 20200621 [jira] [Updated] (KUDU-3156) Whether the CVE-2019-17543 vulnerability of lz affects kudu
- [kudu-issues] 20200709 [jira] [Resolved] (KUDU-3156) Whether the CVE-2019-17543 vulnerability of lz affects kudu
- https://www.oracle.com/security-alerts/cpuoct2020.html
- https://lists.apache.org/thread.html/r0fb226357e7988a241b06b93bab065bcea2eb38658b382e485960e26%40%3Cissues.kudu.apache.org%3E
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://security.netapp.com/advisory/ntap-20210723-0001/
More Lz4 Project Lz4 vulnerabilities
- TI-2021-02479 Integer overflow in lz4 CVSS 3.1CRITICAL 9.8
Sources
- CVE-2019-17543 · CVE Program
- CVE-2019-17543 · NVD
- FIRST EPSS
- GHSA-fxrv-74g3-w7qr · GitHub Advisory Database · CC BY 4.0
- CVE-2019-17543 · 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