CVE-2026-73633Network attack vector

Denial of service via unbounded JSON body read

Published Aug 14, 2026 · Updated Aug 14, 2026

Uncontrolled resource consumption in the Apache Struts JSON plugin allows remote attackers to exhaust server memory with one request. The plugin reads an enabled JSON request body fully into heap memory before its configurable JSON input length limit can constrain the read. Only applications that install the optional plugin and enable JSON request-body population are exposed, and exhaustion denies service to other users.

CVSS severity7.5
High
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in the Apache Struts JSON plugin allows remote attackers to exhaust server memory with one request. The plugin reads an enabled JSON request body fully into heap memory before its configurable JSON input length limit can constrain the read. Only applications that install the optional plugin and enable JSON request-body population are exposed, and exhaustion denies service to other users.

The record

CVE
CVE-2026-73633
Published
Aug 14, 2026
Updated
Aug 14, 2026
Vendor
The Apache Software Foundation
Product
Apache Struts
Classifications
CWE-400, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 14, 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=2.1.8 <=2.3.37
  2. Affected versionversion=2.5.0 <=2.5.33
  3. Affected versionversion=6.0.0 <=6.10.0
  4. Affected versionversion=7.0.0 <=7.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Strutsversion=2.1.8 <=2.3.37; version=2.5.0 <=2.5.33; version=6.0.0 <=6.10.0; version=7.0.0 <=7.2.1

Published CVSS scores

7.5CISA-ADPCVSS: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-400Uncontrolled Resource Consumption
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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