CVE-2026-11897Network attack vector

Unauthenticated service interruption via HTTP/2 memory exhaustion

Published Jul 30, 2026 · Updated Jul 30, 2026

Denial of service in IBM WebSphere Application Server Liberty 17.0.0.3 through 26.0.0.7 allows remote attackers to exhaust server memory. The HTTP/2 request-processing path accepts a specially crafted request and consumes memory without an enforced limit; IBM has not disclosed a finer code locus or request structure. Exploitation requires HTTP/2 exposure with servlet-3.1, servlet-4.0, servlet-5.0, servlet-6.0, or servlet-6.1 enabled and interrupts service by consuming available memory.

CVSS severity7.5
High
EPSS probability0.30%
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 IBM WebSphere Application Server Liberty 17.0.0.3 through 26.0.0.7 allows remote attackers to exhaust server memory. The HTTP/2 request-processing path accepts a specially crafted request and consumes memory without an enforced limit; IBM has not disclosed a finer code locus or request structure. Exploitation requires HTTP/2 exposure with servlet-3.1, servlet-4.0, servlet-5.0, servlet-6.0, or servlet-6.1 enabled and interrupts service by consuming available memory.

The record

CVE
CVE-2026-11897
Published
Jul 30, 2026
Updated
Jul 30, 2026
Vendor
IBM
Product
IBM WebSphere Application Server Liberty
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 30, 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=17.0.0.3 <=26.0.0.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · IBM WebSphere Application Server Libertyversion=17.0.0.3 <=26.0.0.7

Published CVSS scores

7.5IBMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5NVDCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

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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