CVE-2026-32829lz4_flex is a pure Rust implementation of LZ4 compression/decompression.
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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lz4_flex is a pure Rust implementation of LZ4 compression/decompression. In versions 0.11.5 and below, and 0.12.0, decompressing invalid LZ4 data can leak sensitive information from uninitialized memory or from previous decompression operations. The library fails to properly validate offset values during LZ4 "match copy operations," allowing out-of-bounds reads from the output buffer. The block-based API functions (`decompress_into`, `decompress_into_with_dict`, and others when `safe-decode` is disabled) are affected, while all frame APIs are unaffected. The impact is potential exposure of sensitive data and secrets through crafted or malformed LZ4 input. This issue has been fixed in versions 0.11.6 and 0.12.1.
- CVSS
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weakness (CWE)
- CWE-201, CWE-823
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Sep 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
pseitz lz4_flex pseitz:lz4_flex | before 0.11.6; 0.12.0 | NVD |
References
- https://github.com/PSeitz/lz4_flex/commit/055502ee5d297ecd6bf448ac91c055c7f6df9b6dpatch
- https://github.com/PSeitz/lz4_flex/security/advisories/GHSA-vvp9-7p8x-rfvvmitigation, vendor-advisory
- https://rustsec.org/advisories/RUSTSEC-2026-0041.htmlthird-party-advisory
- https://access.redhat.com/errata/RHSA-2026:11800
- https://access.redhat.com/errata/RHSA-2026:16354
- https://access.redhat.com/errata/RHSA-2026:19712
- https://access.redhat.com/errata/RHSA-2026:22862
- https://access.redhat.com/security/cve/CVE-2026-32829
- https://bugzilla.redhat.com/show_bug.cgi?id=2448271
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32829.json
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.