How severe is CVE-2026-34824?

CVE-2026-34824 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-34824 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34824?

CVE-2026-34824 affects Mesop-dev Mesop. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34824?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-34824 have an EU (EUVD) identifier?

Yes. CVE-2026-34824 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18909.

When was CVE-2026-34824 published?

CVE-2026-34824 was published on 2026-04-03 and last updated on 2026-06-17.

CVE-2026-34824

CVE-2026-34824 is a high-severity vulnerability in Mesop-dev Mesop with a CVSS 3.x base score of 7.5. 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-770.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18909
Weakness: CWE-770
Affected product: Mesop-dev Mesop
Published: 2026-04-03
Last modified: 2026-06-17

Description

Mesop is a Python-based UI framework that allows users to build web applications. From version 1.2.3 to before version 1.2.5, an uncontrolled resource consumption vulnerability exists in the WebSocket implementation of the Mesop framework. An unauthenticated attacker can send a rapid succession of WebSocket messages, forcing the server to spawn an unbounded number of operating system threads. This leads to thread exhaustion and Out of Memory (OOM) errors, causing a complete Denial of Service (DoS) for any application built on the framework. This issue has been patched in version 1.2.5.

Frequently asked questions

What is CVE-2026-34824?: Mesop is a Python-based UI framework that allows users to build web applications. From version 1.2.3 to before version 1.2.5, an uncontrolled resource consumption vulnerability exists in the WebSocket implementation of the Mesop framework. An unauthenticated attacker can send a rapid succession of WebSocket messages, forcing the server to spawn an unbounded number of operating system threads. This leads to thread exhaustion and Out of Memory (OOM) errors, causing a complete Denial of Service (DoS) for any application built on the framework. This issue has been patched in version 1.2.5.
How severe is CVE-2026-34824?: CVE-2026-34824 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-34824 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34824?: CVE-2026-34824 affects Mesop-dev Mesop. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34824?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-34824 have an EU (EUVD) identifier?: Yes. CVE-2026-34824 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18909.
When was CVE-2026-34824 published?: CVE-2026-34824 was published on 2026-04-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mesop-dev:mesop:*:*:*:*:*:python:*:*

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