{"id":"CVE-2026-32829","title":"lz4_flex is a pure Rust implementation of LZ4 compression/decompression","summary":"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 op…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-201","CWE-823"],"vendor":"pseitz","product":"lz4_flex","affected":["lz4_flex < 0.11.6","lz4_flex = 0.12.0"],"patched":["lz4_flex 0.11.6"],"published":"2026-03-20","updated":"2026-09-17","sourceUpdated":"2026-09-17T12:17:49.007","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-32829","references":[{"url":"https://github.com/PSeitz/lz4_flex/commit/055502ee5d297ecd6bf448ac91c055c7f6df9b6d","label":"security-advisories@github.com"},{"url":"https://github.com/PSeitz/lz4_flex/security/advisories/GHSA-vvp9-7p8x-rfvv","label":"security-advisories@github.com"},{"url":"https://rustsec.org/advisories/RUSTSEC-2026-0041.html","label":"security-advisories@github.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:11800","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:16354","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:19712","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:22862","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-32829","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2448271","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32829.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-32829"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-32829"},{"url":"https://github.com/PSeitz/lz4_flex"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-03-21T03:02:22.812939Z"},"scores":{"nvd":7.5,"cna":8.2,"vendor":7.5},"epss":0.00608,"epssPercentile":0.47779,"ingestedAt":"2026-07-14T12:36:48.064Z","slug":"CVE-2026-32829","body":"## Overview\n\nlz4_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.\n\n## Affected\n\n- `lz4_flex < 0.11.6`\n- `lz4_flex = 0.12.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `lz4_flex 0.11.6`\n\n## Vendor advisories\n\n- **RHSA-2026:22862** · Red Hat · fixed in: Logging Subsystem for Red Hat OpenShift 6.4 · released 2026-06-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:22862)\n- **RHSA-2026:16354** · Red Hat · fixed in: Logging Subsystem for Red Hat OpenShift 6.5 · released 2026-05-12 · [advisory](https://access.redhat.com/errata/RHSA-2026:16354)\n- **RHSA-2026:11800** · Red Hat · fixed in: Logging for Red Hat OpenShift 6.2 · released 2026-04-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:11800)\n- **RHSA-2026:19712** · Red Hat · fixed in: Red Hat OpenShift AI 3.3 · released 2026-05-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:19712)\n- **Red Hat VEX** · Important · affected: OpenShift Lightspeed, Red Hat Ansible Automation Platform 2 · no fix planned: OpenShift Lightspeed, Red Hat Ansible Automation Platform 2 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32829.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}