CVE-2026-23947Public exploitNetwork attack vectorHinoki check available

Arbitrary code execution via unescaped enum descriptions

Published Jan 20, 2026 · Updated Jan 20, 2026

Code injection in Orval before 7.19.0 and Orval 8.0.0-rc.0 through 8.0.1 allows remote attackers to execute code through crafted OpenAPI input. The getEnumImplementation() function inserts x-enumDescriptions values into const-enum comment text without neutralizing comment terminators, so a payload can escape the comment and become executable TypeScript or JavaScript. The attack requires an untrusted specification to enter generation; execution occurs when a downstream environment consumes the generated client.

CVSS severity9.3
Critical
EPSS probability0.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Code injection in Orval before 7.19.0 and Orval 8.0.0-rc.0 through 8.0.1 allows remote attackers to execute code through crafted OpenAPI input. The getEnumImplementation() function inserts x-enumDescriptions values into const-enum comment text without neutralizing comment terminators, so a payload can escape the comment and become executable TypeScript or JavaScript. The attack requires an untrusted specification to enter generation; execution occurs when a downstream environment consumes the generated client.

The record

CVE
CVE-2026-23947
Published
Jan 20, 2026
Updated
Jan 20, 2026
Vendor
Orval
Product
Orval
Classifications
CWE-94, CWE-77, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=>= 7.10.0, < 8.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Orval · Orvalversion=>= 7.10.0, < 8.0.2

Published CVSS scores

9.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8National Institute of Standards and TechnologyCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059.007JavaScript/JScript

Public exploit references

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

Technologies

Your stack

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Your stack

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