{"id":"CVE-2026-110257","summary":"OW2 ASM 5.0 before 9.11 Excessive Memory Allocation via BootstrapMethods Attribute","details":"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.","modified":"2026-10-16T02:47:31.761819050Z","published":"2026-10-14T14:16:30.933Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110257.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-789"]},"references":[{"type":"WEB","url":"https://repo1.maven.org/maven2/"},{"type":"ADVISORY","url":"https://asm.ow2.io/versions.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110257.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-110257"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/ow2-asm-5.0-before-9.11-excessive-memory-allocation-via-bootstrapmethods-attribute"},{"type":"FIX","url":"https://gitlab.ow2.org/asm/asm/-/commit/eb5fa95bb0670eaec2ecf9b8a3a501b48e5a967c"},{"type":"FIX","url":"https://gitlab.ow2.org/asm/asm/-/merge_requests/456"},{"type":"PACKAGE","url":"https://gitlab.ow2.org/asm/asm"},{"type":"ARTICLE","url":"https://gitlab.ow2.org/asm/asm/-/blob/ASM_9_10_1/asm/src/main/java/org/objectweb/asm/ClassReader.java#L3497"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://gitlab.ow2.org/asm/asm","events":[{"introduced":"46a460a9dcb826f12d6663ccb18fcad876cb492a"},{"fixed":"baeba2ca4e5f8196795340b015ca8b69f39740f5"},{"fixed":"eb5fa95bb0670eaec2ecf9b8a3a501b48e5a967c"}],"database_specific":{"extracted_events":[{"introduced":"5.0"},{"fixed":"9.11"}],"source":["DESCRIPTION","REFERENCES"]}}],"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"}}],"schema_version":"1.9.0","severity":[{"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"}]}