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CVE-2023-26151

22
FAUCET Score

CVE-2023-26151 is a Denial of Service (DoS) vulnerability affecting asyncua package versions prior to 0.9.96, as well as freeopcua and opcua-asyncio. An unauthenticated attacker can send a malformed packet, causing the server to enter an infinite loop and consume excessive memory, leading to service disruption. With a CVSS score of 7.5 (High), this vulnerability is easily exploitable over the network with low complexity and no user interaction. Currently, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.9.96CPE matchmatch criteria
cpe:2.3:a:freeopcua:opcua-asyncio:*:*:*:*:*:python:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.02%
Probability of exploitation in next 30 days
EPSS Percentile
59.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0102 is in the 36th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: asyncuaFixed in: 0.9.96

Vendor Advisories (1)

pipGHSA-gfvq-mxw3-mfq3high

asyncua vulnerable to denial of service via infinite loop

Oct 3, 2023

References

gist.github.com / artfire52/1540b234350795e0ecb4d672608dbec8
ExploitThird Party Advisory
github.com / FreeOpcUa/opcua-asyncio/commit/f6603daa34a93a658f0e176cb0b9ee5a6643b262
Patch
github.com / FreeOpcUa/opcua-asyncio/issues/1013
ExploitIssue TrackingThird Party Advisory
github.com / FreeOpcUa/opcua-asyncio/pull/1039
Patch
github.com / FreeOpcUa/opcua-asyncio/releases/tag/v0.9.96
ProductRelease Notes
security.snyk.io / vuln/SNYK-PYTHON-ASYNCUA-5673709
ExploitPatchThird Party Advisory