CVE-2026-110257CWE-789

CVE-2026-110257

Medium · published October 14, 2026

CVSS v3.1
5.5
EPSS
0%
Percentile
6.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.5 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS v4.0
6.8 · 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
EPSS
0.00172 · 6.3th percentile
Weakness
CWE-789 · Memory Allocation with Excessive Size Value
Published
2026-10-14T19:17Z
References (5)
https://gitlab.ow2.org/asm/asm/-/merge_requests/456 · [email protected]https://www.vulncheck.com/advisories/ow2-asm-5.0-before-9.11-excessive-memory-allocation-via-bootstrapmethods-attribute · [email protected]https://asm.ow2.io/versions.html · [email protected]https://gitlab.ow2.org/asm/asm/-/blob/ASM_9_10_1/asm/src/main/java/org/objectweb/asm/ClassReader.java#L3497 · [email protected]https://gitlab.ow2.org/asm/asm/-/commit/eb5fa95bb0670eaec2ecf9b8a3a501b48e5a967c · [email protected]
EPSS history
Timeline
  • 16 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 14 OCT 14:16Z
    OW2 ASM 5.0 before 9.11 Excessive Memory Allocation via BootstrapMethods Attribute
    cvelistv5
  • 14 OCT 14:16Z
    OW2 ASM 5.0 before 9.11 Excessive Memory Allocation via BootstrapMethods Attribute
    cvelistv5