Libyal libpff through 20260926 heap out-of-bounds read via libpff_record_entry_get_multi_value

{
  "id": "103a9748de03a3b9d6ae8bbd5236aaa58167876dfd5c1d4ae5a3955a1998429e",
  "url": "https://osv.dev/vulnerability/CVE-2026-110598",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Libyal libpff through 20260926 heap out-of-bounds read via libpff_record_entry_get_multi_value",
    "summary": "Libyal libpff through 20260926 contains an integer underflow in libpff_record_entry_get_multi_value() that allows attackers to trigger heap out-of-bounds reads via non-monotonic multi-value offsets. Attackers can craft PST, OST or PAB files with decreasing PT_MV_STRING8, PT_MV_UNICODE or PT_MV_BINARY offsets to crash libpff, pypff or pffexport and expose adjacent heap memory.",
    "evidence": "osv:CVE-2026-110598",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-110598",
      "aliases": [
        "CVE-2026-110598"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/libyal/libpff",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "03545511ab7a7a609e50ec715bdd3985c3be71c5"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "20260926"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "20260926"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "20260926",
            "20231205"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-110598.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:22.375304793Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110598.json",
        "https://hackmd.io/@haind-pwn/libpff-multivalue-offset-underflow-oob-read",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-110598",
        "https://www.vulncheck.com/advisories/libyal-libpff-through-20260926-heap-out-of-bounds-read-via-libpff-record-entry-get-multi-value",
        "https://github.com/libyal/libpff",
        "https://github.com/libyal/libpff/blob/03545511ab7a7a609e50ec715bdd3985c3be71c5/libpff/libpff_multi_value.c#L207-L271",
        "https://github.com/libyal/libpff/blob/03545511ab7a7a609e50ec715bdd3985c3be71c5/libpff/libpff_record_entry.c#L2825-L2874"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-125"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110598.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-110598",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 488793,
  "published_at": "2026-10-14T14:16:40.986+00:00"
}