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Back to active CVEs
High · CVSS 8.7CVE-2026-123543

OpenAM before 16.1.4 Unauthenticated DoS via Unbounded Java DeserialisationCVE-2026-123543

Answer in brief

CVE-2026-123543 records a High severity (CVSS 8.7) vulnerability in OpenAM before 16.1.4 Unauthenticated DoS via Unbounded Java Deserialisation. The current sources do not mark it as known exploited. The current feed maps OpenIdentityPlatform/OpenAM (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 8, 2026Updated Nov 8, 2026Source checked Nov 8, 2026First seen by HOL Nov 8, 2026Material review Nov 8, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.7
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps OpenIdentityPlatform/OpenAM (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
OpenIdentityPlatform/OpenAMgeneric>=0 <16.1.416.1.4

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for OpenIdentityPlatform/OpenAM.
  2. 2Review the reported fix. Update OpenIdentityPlatform/OpenAM to 16.1.4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 8, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source description

OpenAM before 16.1.4 contains a denial of service vulnerability that allows unauthenticated attackers to exhaust server resources by sending serialized Java data without size or structure limits. Attackers can send small crafted requests to remote SDK endpoints, classic login pages, or the administration console to block authentication, session validation and policy decisions.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Devalue before 5.6.3 Denial of Service via Sparse Array SerializationAlso CWE-770
  • Hickory DNS before 0.26.2 DoH Memory Exhaustion via Incomplete Request BodiesAlso CWE-770
  • Hickory DNS 0.24.0 through 0.26.1 Memory Exhaustion via DNS-over-QUIC RequestsAlso CWE-770
  • Hickory DNS 0.24.0 before 0.26.2 DoH Unbounded Request Body Denial of ServiceAlso CWE-770
  • rustls before 0.23.46 Denial of Service via Brotli Certificate DecompressionAlso CWE-770

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-770
Source
CVE List V5
Source checked
Nov 8, 2026
References
2 linked sources
Open source record