CVE-2024-2689Network attack vector

Crashloop via invalid UTF-8 workflow fields

Published Apr 3, 2024 · Updated Aug 27, 2025

Improper input validation in Temporal Server allows remote authenticated users to cause a crashloop through invalid UTF-8 workflow data. Frontend workflow handlers, search-attribute decoding, and history command validation accept malformed strings instead of rejecting them. Workflow permissions are required; a malformed task can remain queued until queue handlers stall and exhaust system resources.

CVSS severity4.4
Medium
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper input validation in Temporal Server allows remote authenticated users to cause a crashloop through invalid UTF-8 workflow data. Frontend workflow handlers, search-attribute decoding, and history command validation accept malformed strings instead of rejecting them. Workflow permissions are required; a malformed task can remain queued until queue handlers stall and exhaust system resources.

The record

CVE
CVE-2024-2689
Published
Apr 3, 2024
Updated
Aug 27, 2025
Vendor
Temporal Technologies
Product
Temporal Server
Classifications
CWE-20, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.20.5
  2. Affected versionversion=1.21.0 <1.21.6
  3. Affected versionversion=1.22.0 <1.22.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Temporal Technologies · Temporal Serverversion=0 <1.20.5; version=1.21.0 <1.21.6; version=1.22.0 <1.22.7

Published CVSS scores

4.4Temporal Technologies Inc.CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo