CVE-2024-27454Network attack vector

Process crash via unbounded JSON nesting

Published Feb 26, 2024 · Updated Aug 2, 2024

Uncontrolled recursion in orjson before 3.9.15 allows remote attackers to crash a consuming process via deeply nested JSON input. The bundled yyjson reader accepts arrays and objects without tracking open-container depth, so orjson.loads continues parsing past safe nesting levels. Reachability requires an application to pass attacker-controlled JSON to orjson.loads; the bounded consequence is consuming-process termination.

CVSS severity7.5
High
EPSS probability1.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled recursion in orjson before 3.9.15 allows remote attackers to crash a consuming process via deeply nested JSON input. The bundled yyjson reader accepts arrays and objects without tracking open-container depth, so orjson.loads continues parsing past safe nesting levels. Reachability requires an application to pass attacker-controlled JSON to orjson.loads; the bounded consequence is consuming-process termination.

The record

CVE
CVE-2024-27454
Published
Feb 26, 2024
Updated
Aug 2, 2024
Vendor
ijl
Product
orjson
Classifications
CWE-674, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 26, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=0 <3.9.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ijl · orjsonversion=0 <3.9.15

Published CVSS scores

7.5MITRECVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-674Uncontrolled Recursion
T1499Endpoint Denial of Service

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

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Your stack

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