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  4. CVE 2026 116014 open62541 150 before 157 integer overflow heap
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Back to active CVEs
Critical · CVSS 9.2CVE-2026-116014

open62541 1.5.0 before 1.5.7 Integer Overflow Heap Buffer Overflow via Custom DataTypeCVE-2026-116014

Answer in brief

CVE-2026-116014 records a Critical severity (CVSS 9.2) vulnerability in open62541 1.5.0 before 1.5.7 Integer Overflow Heap Buffer Overflow via Custom DataType. The current sources do not mark it as known exploited. The current feed maps open62541/open62541 (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 Oct 24, 2026Updated Oct 24, 2026Source checked Oct 24, 2026First seen by HOL Oct 24, 2026Material review Oct 24, 2026
Upstream Advisory

Record context

Vulnerability class
Buffer Overflow
EPSS
Not reported
CWE IDs
CWE-190
Source
CVE List V5
Source checked
Oct 24, 2026
References
6 linked sources
Open source record

Key facts

Risk
Critical · CVSS 9.2
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 9.2. 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 open62541/open62541 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
open62541/open62541generic>=1.5.0 <1.5.71.5.7

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for open62541/open62541.
  2. 2Review the reported fix. Update open62541/open62541 to 1.5.7 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 24, 2026

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

  2. Source modified

    Oct 24, 2026

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

  3. First seen by HOL

    Oct 24, 2026

Sources and claim methodology

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

open62541 1.5.0 before 1.5.7 contains an integer overflow in UA_DataType_fromStructureDescription() that wraps the 16-bit memSize field for large custom structure definitions. A malicious OPC UA server can supply DataType definitions via UA_Client_getRemoteDataTypes(), causing decodeBinaryStructure() to overflow the heap, crashing clients or enabling code execution.

Quoted source text, attributed separately from HOL analysis.