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TI-2026-51717 Aliases CVE-2026-73633GHSA-335q-cpqh-m68h

Apache Struts: Unbounded read of a JSON request body

Priority MEDIUM 40CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-400.

Summary

Uncontrolled resource consumption vulnerability in the JSON plugin of Apache Struts. When an application is configured to populate actions from a JSON request body, the plugin reads that body into memory without bounding how much it will accept, so a single request can exhaust the heap and deny service to other users. The plugin's configurable JSON input length limit does not bound this read. The JSON plugin is an optional component; applications that do not use it, or use it without enabling JSON request-body handling, are not affected. This issue affects Apache Struts: from 2.1.8 through 2.3.37, from 2.5.0 through 2.5.33, from 6.0.0 through 6.10.0, from 7.0.0 through 7.2.1. Users are recommended to upgrade to version 6.11.0 or 7.3.0, which fixes the issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00698 53rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApacheApache Struts2.1.8 – 2.3.37; 2.5.0 – 2.5.33; 6.0.0 – 6.10.0; 7.0.0 – 7.2.1—No fix listedCNA
  • Apache Struts VendorApache Affected 2.1.8 – 2.3.37; 2.5.0 – 2.5.33; 6.0.0 – 6.10.0; 7.0.0 – 7.2.1 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:apache:struts:*:*:*:*:*:*:*:*2.1.8 – 2.3.37; 2.5.0 – 2.5.33; 6.0.0 to before 6.11.0; 7.0.0 to before 7.3.0VulnerableApache
  • cpe:2.3:a:apache:struts:*:*:*:*:*:*:*:* Versions 2.1.8 – 2.3.37; 2.5.0 – 2.5.33; 6.0.0 to before 6.11.0; 7.0.0 to before 7.3.0 Vulnerable ·Apache

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-73633
  2. 2026-10-03 Alias added: GHSA-335q-cpqh-m68h

References

Advisory 1

  • TI-2020-13278 Expression language injection in Apache Struts KEVCVSS 3.1CRITICAL 9.8
  • TI-2017-07171 Improper input validation in Apache Struts KEVCVSS 3.1CRITICAL 9.8
  • TI-2017-03639 Improper handling of exceptional conditions in Apache Struts KEVCVSS 3.1CRITICAL 9.8
  • TI-2013-02013 Apache Struts 2.0.0 through 2.3.15 allows remote attackers to execute arbitrary OGNL… KEVCVSS 3.1CRITICAL 9.8
  • TI-2012-00357 The ExceptionDelegator component in Apache Struts before 2.2.3.1 interprets parameter… KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-08433 Improper input validation in Apache Struts KEVCVSS 3.1HIGH 8.1
See all 98 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences