How severe is CVE-2026-40112?

CVE-2026-40112 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-40112 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40112?

CVE-2026-40112 affects Praison Praisonai. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40112?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-40112 have an EU (EUVD) identifier?

Yes. CVE-2026-40112 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21154.

When was CVE-2026-40112 published?

CVE-2026-40112 was published on 2026-04-09 and last updated on 2026-06-17.

CVE-2026-40112

CVE-2026-40112 is a medium-severity vulnerability in Praison Praisonai with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21154
Weakness: CWE-79
Affected product: Praison Praisonai
Published: 2026-04-09
Last modified: 2026-06-17

Description

PraisonAI is a multi-agent teams system. Prior to 4.5.128, the Flask API endpoint in src/praisonai/api.py renders agent output as HTML without effective sanitization. The _sanitize_html function relies on the nh3 library, which is not listed as a required or optional dependency in pyproject.toml. When nh3 is absent (the default installation), the sanitizer is a no-op that returns HTML unchanged. An attacker who can influence agent input (via RAG data poisoning, web scraping results, or prompt injection) can inject arbitrary JavaScript that executes in the browser of anyone viewing the API output. This vulnerability is fixed in 4.5.128.

Frequently asked questions

What is CVE-2026-40112?: PraisonAI is a multi-agent teams system. Prior to 4.5.128, the Flask API endpoint in src/praisonai/api.py renders agent output as HTML without effective sanitization. The _sanitize_html function relies on the nh3 library, which is not listed as a required or optional dependency in pyproject.toml. When nh3 is absent (the default installation), the sanitizer is a no-op that returns HTML unchanged. An attacker who can influence agent input (via RAG data poisoning, web scraping results, or prompt injection) can inject arbitrary JavaScript that executes in the browser of anyone viewing the API output. This vulnerability is fixed in 4.5.128.
How severe is CVE-2026-40112?: CVE-2026-40112 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-40112 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40112?: CVE-2026-40112 affects Praison Praisonai. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40112?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-40112 have an EU (EUVD) identifier?: Yes. CVE-2026-40112 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21154.
When was CVE-2026-40112 published?: CVE-2026-40112 was published on 2026-04-09 and last updated on 2026-06-17.

References

https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-cfg2-mxfj-j6pw

Affected products (1)

cpe:2.3:a:praison:praisonai:*:*:*:*:*:*:*:*

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