CVE-2023-26151: Versions of the package asyncua before 0.9.96 are vulnerable to Denial of Service (DoS) such that an attacker

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MEDIUM 5.3REMOTEUPGRADE

CVE-2023-26151 is a medium-severity flaw (CVSS 5.3) affecting opcua-asyncio. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Versions of the package asyncua before 0.9.96 are vulnerable to Denial of Service (DoS) such that an attacker can send a malformed packet and as a result, the server will enter into an infinite loop and consume excessive memory.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 33%)
CISA exploited list	No
Weakness	CWE-400, CWE-835
Published	2023-10-03
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: freeopcua

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-10-03 05:15 UTCPublished CVE record published
2026-06-17 05:42 UTCUpdated Record last modified

freeopcua opcua-asyncio UPGRADE

Affected: < 0.9.96

Fixed in: 0.9.96

Safe to downgrade to: no unaffected older release

1. Check installed version

pip show opcua-asyncio

2. UPGRADE to 0.9.96

pip install --upgrade "opcua-asyncio>=0.9.96"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-26151?

opcua-asyncio: upgrade to 0.9.96. Exact commands for each OS are on this page.

Is CVE-2023-26151 being exploited?

CVE-2023-26151 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-26151 affect?

CVE-2023-26151 affects opcua-asyncio. Severity is medium (CVSS 5.3). Versions of the package asyncua before 0.9.96 are vulnerable to Denial of Service (DoS) such that an attacker can send a malformed packet and as a result, the server will enter into an infinite loop and consume excessive memory.

How urgent is CVE-2023-26151?

Priority 45/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-26150 MEDIUM 6.5 UPGRADE Versions of the package asyncua before 0.9.96 are vulnerable to Improper Authentication such that it is possib

References

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