CVE-2026-34824: Mesop is a Python-based UI framework that allows users to build web applications

Q: How do I fix CVE-2026-34824?

mesop: upgrade to 1.2.5. Exact commands for each OS are on this page.

Q: Is CVE-2026-34824 being exploited?

CVE-2026-34824 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-34824 affect?

CVE-2026-34824 affects mesop. Severity is high (CVSS 7.5). 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.

Q: How urgent is CVE-2026-34824?

Priority 50/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-34824 is a high-severity flaw (CVSS 7.5) affecting mesop. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-125, CWE-770
Published	2026-04-03
Last modified	2026-07-24

Publisher (CNA): GitHub, Inc. · Vendor: mesop-dev

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-03 23:17 UTCPublished CVE record published
2026-07-24 22:10 UTCUpdated Record last modified

mesop-dev mesop UPGRADE

Affected: >= 1.2.3 and < 1.2.5

Fixed in: 1.2.5

Safe to downgrade to: a release before 1.2.3

1. Check installed version

pip show mesop

2. UPGRADE to 1.2.5

pip install --upgrade "mesop>=1.2.5"

3. If no update is available yet, DOWNGRADE to a release before 1.2.3

pip index versions mesop pip install "mesop<1.2.3"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-34824?

mesop: upgrade to 1.2.5. Exact commands for each OS are on this page.

Is CVE-2026-34824 being exploited?

CVE-2026-34824 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-2026-34824 affect?

CVE-2026-34824 affects mesop. Severity is high (CVSS 7.5). 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.

How urgent is CVE-2026-34824?

Priority 50/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities

Related CVEs

CVE-2026-33057 CRITICAL 9.8 UPGRADE Mesop is a Python-based UI framework that allows users to build web applications
CVE-2026-33054 CRITICAL 10.0 UPGRADE Mesop is a Python-based UI framework that allows users to build web applications

References

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