OW2 ASM 3.0 before 9.11 contains a quadratic memory allocation vulnerability in MethodWriter.computeMaxStackAndLocal() and computeAllFrames() when using COMPUTE_MAXS or COMPUTE_FRAMES. Attackers can supply a crafted class file with thousands of overlapping exception handlers, causing excessive Edge allocations and an OutOfMemoryError that crashes the JVM.
Fix
Microsoft's update · Moderate
- Release Notes — azl3 objectweb-asm 9.6-1 on Azure Linux 3.0 · build 9.11.1-1
From the 2026-Oct release note of Microsoft's Security Update Guide, revised 2026-10-29.
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 6.8NVD modified 2026-10-14 16:14
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.
References 5
- https://asm.ow2.io/versions.html
- https://gitlab.ow2.org/asm/asm/-/blob/ASM_9_10_1/asm/src/main/java/org/objectweb/asm/MethodWriter.java#L1662
- https://gitlab.ow2.org/asm/asm/-/commit/91057c98239d994aed5e46434e34e00d593c0daf
- https://gitlab.ow2.org/asm/asm/-/merge_requests/461
- https://www.vulncheck.com/advisories/ow2-asm-3.0-before-9.11-quadratic-memory-allocation-via-exception-handlers