CVE-2026-73635Network attack vector

Unauthenticated denial of service via request-locale cache growth

Published Aug 15, 2026 · Updated Aug 15, 2026

Resource exhaustion in affected Apache Struts releases allows remote attackers to exhaust the Java heap via request-selected locales. The localized-text lookup path uses the incoming request locale for cache entries and retains those entries without a size bound. Unauthenticated network access is sufficient when no fixed locale is configured; affected releases span 2.0.0 through 2.3.37, 2.5.0 through 2.5.33, 6.0.0 through 6.10.0, and 7.0.0 through 7.2.1.

CVSS severity7.5
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in affected Apache Struts releases allows remote attackers to exhaust the Java heap via request-selected locales. The localized-text lookup path uses the incoming request locale for cache entries and retains those entries without a size bound. Unauthenticated network access is sufficient when no fixed locale is configured; affected releases span 2.0.0 through 2.3.37, 2.5.0 through 2.5.33, 6.0.0 through 6.10.0, and 7.0.0 through 7.2.1.

The record

CVE
CVE-2026-73635
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Apache Software Foundation
Product
Apache Struts
Classifications
CWE-770, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=2.0.0 <=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=2.0.0 <=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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
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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