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Vulnerabilities

Vulnerability · CVE-2026-32829

lz4_flex is a pure Rust implementation of LZ4 compression/decompression.

Published Mar 20, 2026 · catalog updated Sep 17, 2026 · lz4 flex

Check if you run it

No confirmed exploitation is on record for CVE-2026-32829. EPSS is 0.72%. Act only if a listed version of lz4 flex is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.2
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.72%
Remediation
Advisory link
Affected products
cpe pseitz/lz4 flex

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 ( , , and others when 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe pseitz/lz4 flex0.12.0

How to fix CVE-2026-32829

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-32829. EPSS is 0.72%. Act only if a listed version of lz4 flex is installed.

Which versions are affected?

Compare what you have installed with pseitz/lz4 flex 0.12.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-201; CWE-823. EPSS 0.72%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 20, 2026 · NIST NVD

    Detected

    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-ba

  2. Sep 17, 2026 · NIST NVD

    Updated

    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-ba

Sources

  • CVE.orgVulnerability recordCVE-2026-32829

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-32829

    30-day exploitation probability 0.7%

    first.org
  • NIST NVDVulnerability recordCVE-2026-32829

    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 val

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.