CVE-2022-38751Public exploitNetwork attack vector

Application crash via unbounded regex matching

Published Sep 5, 2022 · Updated Apr 21, 2025

Denial of service in SnakeYAML before 1.31 allows remote authenticated users to crash applications by submitting crafted YAML. The parser passes attacker-controlled scalar content to regular-expression matching without limiting the matched data, exhausting Java's call stack. Reachability requires a consuming application to parse untrusted YAML, and exploitation interrupts that application rather than the underlying host.

CVSS severity6.5
Medium
EPSS probability1.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in SnakeYAML before 1.31 allows remote authenticated users to crash applications by submitting crafted YAML. The parser passes attacker-controlled scalar content to regular-expression matching without limiting the matched data, exhausting Java's call stack. Reachability requires a consuming application to parse untrusted YAML, and exploitation interrupts that application rather than the underlying host.

The record

CVE
CVE-2022-38751
Published
Sep 5, 2022
Updated
Apr 21, 2025
Vendor
SnakeYAML
Product
SnakeYAML
Classifications
CWE-787, CWE-121, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 5, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 21, 2025Record 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=unspecified <1.31

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SnakeYAML · SnakeYAMLversion=unspecified <1.31

Published CVSS scores

6.5GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:L/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-121Stack-based Buffer Overflow
T1499.004Application or System Exploitation

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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