CVE-2026-32829: lz4_flex is a pure Rust implementation of LZ4 compression/decompression

Q: How do I fix CVE-2026-32829?

lz4 flex: upgrade to 0.11.6. Exact commands for each OS are on this page.

Q: Is CVE-2026-32829 being exploited?

CVE-2026-32829 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-32829 affect?

CVE-2026-32829 affects lz4 flex. Severity is high (CVSS 7.5). 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 opera

Q: How urgent is CVE-2026-32829?

Priority 44/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-32829 is a high-severity flaw (CVSS 7.5) affecting lz4 flex. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-201, CWE-823
Published	2026-03-20
Last modified	2026-09-17

Publisher (CNA): GitHub, Inc. · Vendor: pseitz

Last updated 2026-09-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-20 01:15 UTCPublished CVE record published
2026-09-17 12:17 UTCUpdated Record last modified

pseitz lz4 flex UPGRADE

Affected: < 0.11.6 · 0.12.0

Fixed in: 0.11.6

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy lz4-flex || rpm -q lz4-flex || lz4-flex --version

2. UPGRADE to 0.11.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade lz4-flex

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade lz4-flex

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-32829?

lz4 flex: upgrade to 0.11.6. Exact commands for each OS are on this page.

Is CVE-2026-32829 being exploited?

CVE-2026-32829 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-32829 affect?

CVE-2026-32829 affects lz4 flex. Severity is high (CVSS 7.5). 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 opera

How urgent is CVE-2026-32829?

Priority 44/100. High severity; Remotely exploitable, no login, no user action

References

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