OW2 ASM 5.0 before 9.11 Excessive Memory Allocation via BootstrapMethods Attribute

{
  "id": "c34f9284c2cefc67885927028d25730e2799bea67c67f58dbd9f039d70f18421",
  "url": "https://osv.dev/vulnerability/CVE-2026-110257",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "OW2 ASM 5.0 before 9.11 Excessive Memory Allocation via BootstrapMethods Attribute",
    "summary": "OW2 ASM 5.0 before 9.11 contains an excessive memory allocation vulnerability in ClassReader.readBootstrapMethodsAttribute() that sizes an int array from num_bootstrap_methods without validating attribute_length. Attackers can supply a crafted class file of about 100 bytes that forces roughly 2 GB allocation, causing an OutOfMemoryError that crashes the JVM or consuming thread.",
    "evidence": "osv:CVE-2026-110257",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-110257",
      "aliases": [
        "CVE-2026-110257"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://gitlab.ow2.org/asm/asm",
              "type": "GIT",
              "events": [
                {
                  "introduced": "46a460a9dcb826f12d6663ccb18fcad876cb492a"
                },
                {
                  "fixed": "baeba2ca4e5f8196795340b015ca8b69f39740f5"
                },
                {
                  "fixed": "eb5fa95bb0670eaec2ecf9b8a3a501b48e5a967c"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "5.0"
                      },
                      {
                        "fixed": "9.11"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "eb5fa95bb0670eaec2ecf9b8a3a501b48e5a967c"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "ASM_9_10_1",
            "ASM_9_10",
            "ASM_9_9_1",
            "ASM_9_9",
            "ASM_9_8",
            "ASM_9_7_1",
            "ASM_9_7",
            "ASM_9_6",
            "ASM_9_5",
            "ASM_9_4",
            "ASM_9_3",
            "ASM_9_2",
            "ASM_9_1",
            "ASM_9_0",
            "ASM_9_0_BETA",
            "ASM_8_0_1",
            "ASM_8_0",
            "ASM_7_3_1",
            "ASM_7_2",
            "ASM_7_2_BETA",
            "ASM_7_1",
            "ASM_7_0",
            "ASM_7_0_BETA",
            "ASM_6_2_1",
            "ASM_6_2",
            "ASM_6_1_1",
            "ASM_6_1",
            "ASM_6_1_BETA2",
            "ASM_6_1_BETA",
            "ASM_6_0",
            "ASM_6_0_BETA",
            "ASM_5_2",
            "ASM_5_1",
            "ASM_5_0_4",
            "ASM_5_0_3",
            "ASM_5_0_2",
            "ASM_5_0_1",
            "ASM_5_0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-110257.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.347609763Z",
      "provider": "osv",
      "references": [
        "https://repo1.maven.org/maven2/",
        "https://asm.ow2.io/versions.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110257.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-110257",
        "https://www.vulncheck.com/advisories/ow2-asm-5.0-before-9.11-excessive-memory-allocation-via-bootstrapmethods-attribute",
        "https://gitlab.ow2.org/asm/asm/-/commit/eb5fa95bb0670eaec2ecf9b8a3a501b48e5a967c",
        "https://gitlab.ow2.org/asm/asm/-/merge_requests/456",
        "https://gitlab.ow2.org/asm/asm",
        "https://gitlab.ow2.org/asm/asm/-/blob/ASM_9_10_1/asm/src/main/java/org/objectweb/asm/ClassReader.java#L3497"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-789"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110257.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-110257",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 491935,
  "published_at": "2026-10-14T14:16:30.933+00:00"
}