CVE-2026-110591 — OW2 ASM 1.4.3 before 9.11 Excessive Resource Consumption via Analyzer
OW2 ASM 1.4.3 before 9.11 contains an excessive resource consumption vulnerability in Analyzer.analyze() that allows attackers to exhaust memory and CPU via crafted class files. Attackers can supply class files analysed through BasicVerifier, SimpleVerifier or SourceInterpreter to trigger unbounded per-instruction Frame allocation and fix point iterations, causing denial of service.
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- Technical severity (medium)+3
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (OW2 ASM).
- No fix documented in the sources: reduce exposure and monitor the vendor advisory.
- Exploitation requires user interaction: tighten email/web filtering and warn affected users.
- Search available logs for exploit probes matching the vulnerability class (denial of service), errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 6.8 | CVSS 4.0 | Medium | — | — | disclosure@vulncheck.com via NIST National Vulnerability Database |
| 6.8 | CVSS 4.0 | Medium | — | — | VulnCheck via CVE Program (cve.org) e CISA ADP |
| 5.5 | CVSS 3.1 | Medium | 1.8 | 3.6 | disclosure@vulncheck.com via NIST National Vulnerability Database |
| 5.5 | CVSS 3.1 | Medium | — | — | VulnCheck via CVE Program (cve.org) e CISA ADP |
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H (score shown at the top: disclosure@vulncheck.com) Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
CWE-770 · Allocation of Resources Without Limits or Throttling
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
- Track CPU/memory spikes and availability drops correlated with request patterns.
Timeline
What happened to this CVE, newest first.
- 2026
- Affected products added · ow2/asm
- Record published
- CVSS changed · 5.5
- Source status changed · → Received
- Record created in this database
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 1× References added · Oct 14, 2026 – Oct 14, 2026
- 1× Official description updated · Oct 14, 2026 – Oct 14, 2026
References
5 on the record
- gitlab.ow2.org/asm/asm/-/merge_requests/468
- gitlab.ow2.org/asm/asm/-/commit/4632a2283f1192fd0e93035661b49568a7cb8b6c
- gitlab.ow2.org/asm/asm/-/blob/ASM_9_10_1/asm-analysis/src/main/java/org/objectweb/as
- asm.ow2.io/versions.html
- www.vulncheck.com/advisories/ow2-asm-1.4.3-before-9.11-excessive-resource-consumption-v
Elsewhere on this site
Related CVEs (same products)
- Low CVE-2026-110262 OW2 ASM 3.1 before 9.11 Excessive Memory Allocation in AdviceAdapter 1d
- Medium CVE-2026-110263 OW2 ASM 3.0 before 9.11 Uncontrolled Recursion in SignatureReader 1d
- Medium CVE-2026-110270 OW2 ASM 3.0 before 9.11 Exponential Memory Allocation in JSRInlinerAdapter 1d
- Medium CVE-2026-110257 OW2 ASM 5.0 before 9.11 Excessive Memory Allocation via BootstrapMethods Attribute 1d
- Medium CVE-2026-110258 OW2 ASM 3.0 before 9.11 Excessive Memory Allocation via Multiple RET Instructions 1d
- Medium CVE-2026-110259 OW2 ASM 3.0 before 9.11 Uncontrolled Recursion via ClassWriter.replaceAsmInstructions() 1d
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No FIRST EPSS score.
- No fixed version, patch or mitigation documented.
- No CISA SSVC assessment.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2026-110591 is "OW2 ASM 1.4.3 before 9.11 Excessive Resource Consumption via Analyzer", rated Medium. It affects ASM (OW2); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 5.5 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
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