CVE-2026-82623

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.70% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 52.7% of scored records. A rank, not a probability.

NVD base score

5.5 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-08-31.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-08-31 06:15Z1 MO AGO

Last updated

2026-08-31 16:24Z1 MO AGO

Reserved

2026-08-30

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 6.9)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

Weaknesses

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass
• CWE-416Use After FreeVariant
• CWE-825Expired Pointer DereferenceBase

Data version

5.2

Document digest

b07ef07158fca6cb4d370398962effc172e4e92d3fa535abb6e5271921c53bba

• vuldb.comVDB-397123 | open62541 History Backend ua_history_data_backend_memory.c UA_DataValue_backend_copyRange use after freehttps://vuldb.com/vuln/397123vdb-entrytechnical-description
• vuldb.comVDB-397123 | CTI Indicators (IOB, IOC, IOA)https://vuldb.com/vuln/397123/ctisignaturepermissions-required
• vuldb.comCVE-2026-82623 | CVE Analysis and Reporthttps://vuldb.com/cve/CVE-2026-82623third-party-advisory
• vuldb.comSubmit #893207 | open62541 Project open62541 1.5.5 Use After Freehttps://vuldb.com/submit/893207third-party-advisory
• github.comhttps://github.com/open62541/open62541/issues/8199exploitissue-tracking
• github.comhttps://github.com/open62541/open62541/product