CVE-2024-2689: Denial of Service if invalid UTF-8 sent
Noroxi assessment
Priority: Monitor (action score 17/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.48% (FIRST EPSS).
- Anyone who can reach it over the internet can trigger it. Administrator privileges are required. No user action is required. Special conditions such as timing or configuration are required.
- Fixed version: Temporal Technologies, Inc. Temporal Server 1.20.5, 1.21.6, 1.22.7.
Low priority for now. Upgrade to Temporal Technologies, Inc. Temporal Server 1.20.5, 1.21.6, 1.22.7 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
Denial of Service in Temporal Server prior to version 1.20.5, 1.21.6, and 1.22.7 allows an authenticated user who has permissions to interact with workflows and has crafted an invalid UTF-8 string for submission to potentially cause a crashloop. If left unchecked, the task containing the invalid UTF-8 will become stuck in the queue, causing an increase in queue lag. Eventually, all processes handling these queues will become stuck and the system will run out of resources. The workflow ID of the failing task will be visible in the logs, and can be used to remove that workflow as a mitigation. Version 1.23 is not impacted. In this context, a user is an operator of Temporal Server.
- Published
- Apr 3, 2024
- Updated
- Jun 17, 2026
- EPSS
- 0.4% · 41th percentile
- CWE
- CWE-20
Report tools
Action score
17
Monitor
Low priority for now.
- CVSS
- 17 / 40 · 4.4 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.4%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · Temporal
- 4.4
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
—
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Temporal). Independent of NVD's CPE analysis and usually ahead of it.
Temporal Technologies, Inc. Temporal Server
- before 1.20.5affected · semver
- 1.21.0 and later · before 1.21.6affected · semver
- 1.22.0 and later · before 1.22.7affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Go | github.com/temporalio/temporal | from 1.21.0 · before 1.21.6 | 1.21.6 |
| Go | github.com/temporalio/temporal | from 1.22.0-rc1 · before 1.22.7 | 1.22.7 |
| Go | github.com/temporalio/temporal | before 1.20.5 | 1.20.5 |
| Go | go.temporal.io/server | from 1.21.0 · before 1.21.6 | 1.21.6 |
| Go | go.temporal.io/server | from 1.22.0-rc1 · before 1.22.7 | 1.22.7 |
| Go | go.temporal.io/server | before 1.20.5 | 1.20.5 |
Same product
Other highest-scoring records for the same primary product.
- CVE-2026-89139Temporal Server worker deployment compute provider executes a caller-supplied command on the Worker Service host34Monitor
- CVE-2026-104355Temporal Server applies inbound namespace replication from a connected peer cluster to local namespaces28Monitor
- CVE-2026-87858Temporal Server completion callback source header can direct attacker-chosen requests to the internal frontend with administrator authorization28Monitor
Published before and after this one in the same product
- Later →CVE-2026-16652Sep 21, 2026 · Temporal Server Schedule exclusion search can cause excessive CPU consumption28Monitor
- Later →CVE-2026-89140Oct 12, 2026 · Temporal Server internal completion callbacks are not bound to their namespace, allowing cross-namespace changes to Scheduler V2 schedule state24Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Temporal Technologies, Inc. Temporal Server | 1.20.5 | Vendor (CNA) |
| Temporal Technologies, Inc. Temporal Server | 1.21.6 | Vendor (CNA) |
| Temporal Technologies, Inc. Temporal Server | 1.22.7 | Vendor (CNA) |
| Go:github.com/temporalio/temporal | 1.20.5 | Package registry (OSV) |
| Go:github.com/temporalio/temporal | 1.21.6 | Package registry (OSV) |
| Go:github.com/temporalio/temporal | 1.22.7 | Package registry (OSV) |
| Go:go.temporal.io/server | 1.20.5 | Package registry (OSV) |
| Go:go.temporal.io/server | 1.21.6 | Package registry (OSV) |
| Go:go.temporal.io/server | 1.22.7 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- Administrator privileges are required.
- No user action is required.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-20 · Improper Input ValidationCVSS vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Server Side Include (SSI) InjectionCAPEC-101likelihood: High · High
- Cross Zone ScriptingCAPEC-104likelihood: Medium · High
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Object Relational Mapping InjectionCAPEC-109likelihood: Low · High
- SQL Injection through SOAP Parameter TamperingCAPEC-110likelihood: High · Very High
- Double EncodingCAPEC-120likelihood: Low · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
ATT&CK techniques
- Obfuscated Files or InformationT1027
- Masquerading: Invalid Code SignatureT1036.001
- Steal Web Session CookieT1539
- Subvert Trust Controls: Code SigningT1553.002
- Impair Defenses:Impair Command History LoggingT1562.003
- Hijack Execution Flow:Dynamic Linker HijackingT1574.006
- Hijack Execution Flow:Path Interception by PATH Environment VariableT1574.007
Change log
- Fix✗ → ✓
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References
Vendor advisories and official records. Exploit/PoC links are deliberately left out.