CVE-2026-82623Network attack vectorHinoki check available

Remote server crash via shallow range copy

Published Aug 31, 2026 · Updated Aug 31, 2026

Use-after-free in o6 Automation GmbH open62541 1.5.0 through 1.5.5 allows remote attackers to crash servers via crafted history reads. UA_DataValue_backend_copyRange makes a shallow copy before validating the untrusted indexRange, allowing failed-copy cleanup to free storage still referenced by the original value. Reachability requires the in-memory History Backend and exposure of the affected range-copy path to remote OPC UA requests; the bounded consequence is a service-interrupting process crash.

CVSS severity5.3
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Use-after-free in o6 Automation GmbH open62541 1.5.0 through 1.5.5 allows remote attackers to crash servers via crafted history reads. UA_DataValue_backend_copyRange makes a shallow copy before validating the untrusted indexRange, allowing failed-copy cleanup to free storage still referenced by the original value. Reachability requires the in-memory History Backend and exposure of the affected range-copy path to remote OPC UA requests; the bounded consequence is a service-interrupting process crash.

The record

CVE
CVE-2026-82623
Published
Aug 31, 2026
Updated
Aug 31, 2026
Vendor
o6 Automation GmbH
Product
open62541
Classifications
CWE-119, CWE-416, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 31, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.5.0
  2. Affected versionversion=1.5.1
  3. Affected versionversion=1.5.2
  4. Affected versionversion=1.5.3
  5. Affected versionversion=1.5.4
  6. Affected versionversion=1.5.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

o6 Automation GmbH · open62541version=1.5.0; version=1.5.1; version=1.5.2; version=1.5.3; version=1.5.4; version=1.5.5

Published CVSS scores

5.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-416Use After Free
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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