Open62541 1.5.5 High-Level Attribute Reading Logic ua_client_highlevel.c buffer overflow

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.2$0-$5k3.75

Summaryinfo

A vulnerability, which was classified as problematic, was found in Open62541 1.5.5. The affected element is an unknown function of the file src/client/ua_client_highlevel.c of the component High-Level Attribute Reading Logic. Executing a manipulation can lead to buffer overflow. This vulnerability is handled as CVE-2026-67862. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability has been found in Open62541 1.5.5 and classified as problematic. This vulnerability affects some unknown functionality of the file src/client/ua_client_highlevel.c of the component High-Level Attribute Reading Logic. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect availability. CVE summarizes:

open62541 1.5.5 contains a buffer-overflow in the high-level attribute reading logic in src/client/ua_client_highlevel.c. This allows a remote attacker to cause a denial of service.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-67862 since 07/30/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/05/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.2

VulDB Base Score: 4.3
VulDB Temp Score: 4.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

07/30/2026 CVE reserved
08/04/2026 +5 days VulDB entry created
08/05/2026 +0 days Advisory disclosed
08/05/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Not defined

CVE: CVE-2026-67862 (🔒)
GCVE (CVE): GCVE-0-2026-67862
GCVE (VulDB): GCVE-100-385996

Entryinfo

Created: 08/05/2026 00:35
Changes: 08/05/2026 00:35 (54)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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