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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 10.5%, higher than 96% of all known CVEs. Patch or mitigate before the next change window.
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."
- CVSS 3.1
- 8.1 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 10.45% probability · 96th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- lz4 project/lz4
- Source
- cve@mitre.org
EPSS moved from 10.5% on 25 October 2026 to 10.5% on 26 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
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=15941Third Party Advisory
- https://github.com/lz4/lz4/compare/v1.9.1...v1.9.2Third Party Advisory
- https://github.com/lz4/lz4/issues/801Third Party Advisory
- https://github.com/lz4/lz4/pull/756Patch, Third Party Advisory
- https://github.com/lz4/lz4/pull/760Patch, Third Party Advisory
- 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
- https://lists.apache.org/thread.html/f506bc371d4a068d5d84d7361293568f61167d3a1c3e91f0def2d7d3%40%3Cdev.arrow.apache.org%3E
- https://lists.apache.org/thread.html/r0fb226357e7988a241b06b93bab065bcea2eb38658b382e485960e26%40%3Cissues.kudu.apache.org%3E
- https://lists.apache.org/thread.html/r4068ba81066792f2b4d208b39c4c4713c5d4c79bd8cb6c1904af5720%40%3Cissues.kudu.apache.org%3E
- https://lists.apache.org/thread.html/r7bc72200f94298bc9a0e35637f388deb53467ca4b2e2ad1ff66d8960%40%3Cissues.kudu.apache.org%3E
- https://security.netapp.com/advisory/ntap-20210723-0001/
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://www.oracle.com/security-alerts/cpuoct2020.html
- 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=15941Third Party Advisory
- https://github.com/lz4/lz4/compare/v1.9.1...v1.9.2Third Party Advisory
- https://github.com/lz4/lz4/issues/801Third Party Advisory
- https://github.com/lz4/lz4/pull/756Patch, Third Party Advisory
- https://github.com/lz4/lz4/pull/760Patch, Third Party Advisory
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.