CVE-2022-21404Public exploitNetwork attack vector

Remote code execution via unsafe YAML deserialization

Published Apr 19, 2022 · Updated Sep 24, 2024

Unsafe YAML deserialization in Oracle Helidon 1.4.10 and 2.0.0-RC1 allows remote attackers to execute code through a crafted HTTP-served configuration. The YAML parser creates SnakeYAML with its unsafe default constructor and passes an InputStreamReader to loadAs(Map.class), allowing tagged objects to instantiate attacker-chosen classes. Exploitation requires an application to load attacker-controlled YAML through UrlConfigSource; resulting code runs in the application process and can take over the service.

CVSS severity8.1
High
EPSS probability1.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe YAML deserialization in Oracle Helidon 1.4.10 and 2.0.0-RC1 allows remote attackers to execute code through a crafted HTTP-served configuration. The YAML parser creates SnakeYAML with its unsafe default constructor and passes an InputStreamReader to loadAs(Map.class), allowing tagged objects to instantiate attacker-chosen classes. Exploitation requires an application to load attacker-controlled YAML through UrlConfigSource; resulting code runs in the application process and can take over the service.

The record

CVE
CVE-2022-21404
Published
Apr 19, 2022
Updated
Sep 24, 2024
Vendor
Oracle Corporation
Product
Helidon
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 19, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2024Record 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=1.4.10
  2. Affected versionversion=2.0.0-RC1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Oracle Corporation · Helidonversion=1.4.10; version=2.0.0-RC1

Published CVSS scores

8.1Oracle CorporationCVSS:3.1/AV:N/AC:H/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.

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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

T1190Exploit Public-Facing Application

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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