CVE-2021-3520
CRITICAL9.8EPSS 0.14%Memory corruption in liblz4
Published: 8/25/2022Modified: 2/4/2026
Also known as:GHSA-9q5j-jm53-v7vrDSA-4919-1ALPINE-CVE-2021-3520DEBIAN-CVE-2021-3520RUSTSEC-2022-0051
Description
lz4-sys up to v1.9.3 bundles a version of liblz4 that is vulnerable to [CVE-2021-3520](https://nvd.nist.gov/vuln/detail/CVE-2021-3520). Attackers could craft a payload that triggers an integer overflow upon decompression, causing an out-of-bounds write. The flaw has been corrected in version v1.9.4 of liblz4, which is included in lz4-sys 1.9.4.
Affected packages (5)
- Alpine/lz4from 0, < 1.9.2-r1
- crates.io/lz4-sys>= 0.0.0-0, < 1.9.4
- Debian/lz4from 0, < 1.9.3-2
- Debian/lz4from 0, < 0.0~r131-2+deb9u1
- Debian/lz4from 0, < 1.8.3-1+deb10u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |