CVE-2019-17543

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 10.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-10-14 · updated 2026-10-14
Weakness: CWE-787

Description

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."

Affected products

Lz4 Project Lz4: before 1.9.2 — fixed in 1.9.2

How to fix

Upgrade to a fixed version: Lz4 Project Lz4 1.9.2. Check the vendor advisory for mitigations.

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
https://github.com/lz4/lz4/pull/756
https://github.com/lz4/lz4/pull/760
https://lists.apache.org/thread.html/25015588b770d67470b7ba7ea49a305d6735dd7f00eabe7d50ec1e17%40%3Cissues.arrow.apache.org%3E
https://lists.apache.org/thread.html/543302d55e2d2da4311994e9b0debdc676bf3fd05e1a2be3407aa2d6%40%3Cissues.arrow.apache.org%3E
https://lists.apache.org/thread.html/793012683dc0fa6819b7c2560e6cf990811014c40c7d75412099c357%40%3Cissues.arrow.apache.org%3E
https://lists.apache.org/thread.html/9ff0606d16be2ab6a81619e1c9e23c3e251756638e36272c8c8b7fa3%40%3Cissues.arrow.apache.org%3E
https://lists.apache.org/thread.html/f0038c4fab2ee25aee849ebeff6b33b3aa89e07ccfb06b5c87b36316%40%3Cissues.arrow.apache.org%3E

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