CVE-2019-17543

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."

CVSS 3.1

8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

10% chance of exploitation in the next 30 days; higher than 95% of CVEs (scores of 2026-10-25)

CWE

CWE-787

Published

2019-10-14

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• lz4_project:lz4

References

• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00069.html
• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00070.html
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=15941
• https://github.com/lz4/lz4/compare/v1.9.1...v1.9.2
• https://github.com/lz4/lz4/issues/801

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