CVE-2026-15057Network attack vector

Service interruption via HTTP/2 out-of-bounds write

Published Jul 28, 2026 · Updated Jul 28, 2026

Denial of service in IBM WebSphere Application Server Liberty 17.0.0.3 through 26.0.0.7 allows remote attackers to interrupt service. IBM has not disclosed the exact HTTP/2 processing locus; an out-of-bounds write drives uncontrolled heap allocation. Exposure requires servlet-3.1 through servlet-6.1, as applicable, with HTTP/2 enabled, and the reported consequence is service interruption rather than data access.

CVSS severity7.5
High
EPSS probability0.26%
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 interrupt service. IBM has not disclosed the exact HTTP/2 processing locus; an out-of-bounds write drives uncontrolled heap allocation. Exposure requires servlet-3.1 through servlet-6.1, as applicable, with HTTP/2 enabled, and the reported consequence is service interruption rather than data access.

The record

CVE
CVE-2026-15057
Published
Jul 28, 2026
Updated
Jul 28, 2026
Vendor
IBM
Product
IBM WebSphere Application Server Liberty
Classifications
CWE-787, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 28, 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: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-787Out-of-bounds Write
T1499Endpoint Denial of Service

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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