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Fencer Vulns
medium 5.5

CVE-2026-110261 json

OW2 ASM 3.0 before 9.11 Excessive CPU Consumption via ClassWriter COMPUTE_FRAMES

published 2026-10-14 25 d ago modified 2026-10-14 25 d ago also EUVD-2026-101215

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 6%
public exploits
0
none known

Summary

OW2 ASM 3.0 before 9.11 contains a denial of service vulnerability that allows attackers to exhaust CPU by supplying crafted class files processed with ClassWriter.COMPUTE_FRAMES. Attackers can craft methods that make the unbounded MethodWriter.computeAllFrames() fix point algorithm converge slowly, tying up transforming threads for unbounded time.

Patch / fix

  • OW2 ASM 9.11
  • asm Debian 14 9.11.1-1

debian advisories DEBIAN-CVE-2026-110261

  • maven3.9 hummingbird 1 3.9.16-0.4.hum1
  • maven3.9-lib hummingbird 1 3.9.16-0.4.hum1

red hat advisories RHSA-2026:83847

  • objectweb-asm Azure Linux 3.0 9.11.1-1

azure linux advisories AZL-108411

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-110261 updated cvss 5.5

org.ow2.asm/asm: OW2 ASM: Denial of Service via crafted class files during frame computation

  • Red Hat build of Quarkus asm 9.9.1.redhat-00001
    affected: no fix available
  • Red Hat Hardened Images maven3.9 3.9.16-0.4.hum1, maven3.9-lib 3.9.16-0.4.hum1
    fixed: vendor fix RHSA-2026:83847

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
25 d ago

Exploit prediction

0.17% chance of exploitation in the next 30 days, higher than 6% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 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
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CNA 4.0 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • OW2 ASM

Classification

Weakness
  • CWE-407 Inefficient Algorithmic Complexity

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.