rust-lz4-flex — security advisory

{
  "id": "6fada0839241a7f0a555c08fbb836d909663d7a37e2409226336fd8a9a17bc52",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-32829",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-32829",
    "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 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.",
    "evidence": "osv:UBUNTU-CVE-2026-32829",
    "products": [
      {
        "name": {
          "value": "rust-lz4-flex",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "0.11.1-1",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "rust-lz4-flex",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "0.11.3-1",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "rust-lz4-flex",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "0.11.3-2",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "0.13.0-1",
            "evidence": "/affected/2/versions"
          }
        ]
      },
      {
        "name": {
          "value": "rust-lz4-flex",
          "evidence": "/affected/3/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "0.11.3-1",
            "evidence": "/affected/3/versions"
          },
          {
            "value": "0.11.3-2",
            "evidence": "/affected/3/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "UBUNTU-CVE-2026-32829",
      "aliases": [
        "UBUNTU-CVE-2026-32829"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
        },
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
        },
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "rust-lz4-flex",
            "purl": "pkg:deb/ubuntu/rust-lz4-flex?arch=source&distro=noble",
            "ecosystem": "Ubuntu:24.04:LTS"
          },
          "versions": [
            "0.11.1-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32829.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "librust-lz4-flex-dev",
                "binary_version": "0.11.1-1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "rust-lz4-flex",
            "purl": "pkg:deb/ubuntu/rust-lz4-flex?arch=source&distro=questing",
            "ecosystem": "Ubuntu:25.10"
          },
          "versions": [
            "0.11.3-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32829.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "librust-lz4-flex-dev",
                "binary_version": "0.11.3-1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "rust-lz4-flex",
            "purl": "pkg:deb/ubuntu/rust-lz4-flex?arch=source&distro=stonking",
            "ecosystem": "Ubuntu:26.10"
          },
          "versions": [
            "0.11.3-2",
            "0.13.0-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32829.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "librust-lz4-flex-dev",
                "binary_version": "0.13.0-1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "rust-lz4-flex",
            "purl": "pkg:deb/ubuntu/rust-lz4-flex?arch=source&distro=resolute",
            "ecosystem": "Ubuntu:26.04:LTS"
          },
          "versions": [
            "0.11.3-1",
            "0.11.3-2"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32829.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "librust-lz4-flex-dev",
                "binary_version": "0.11.3-2"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-17T12:59:58.370194880Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-32829"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-32829",
        "https://www.cve.org/CVERecord?id=CVE-2026-32829",
        "https://rustsec.org/advisories/RUSTSEC-2026-0041.html",
        "https://github.com/advisories/GHSA-vvp9-7p8x-rfvv"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-32829",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 360044,
  "published_at": "2026-03-20T01:15:00+00:00"
}