IBM WebSphere Application Server Liberty: Denial of Service (CVE-2026-93879)
Published Sources: Red Hat, BSI
What is affected, what to do
A flaw was found in Hibernate Validator starting with version 5.4.1. This vulnerability allows an unauthenticated remote attacker to cause a Denial of Service (DoS) by submitting specially crafted input containing unescaped message parameters.
Update IBM WebSphere Application Server Liberty to version 26.0.0.12, IBM WebSphere Application Server Liberty to version 26.0.0.11.
- Affected
- IBM WebSphere Application Server Liberty
< *..26.0.0.12 - IBM WebSphere Application Server Liberty
range_unparsed *..<26.0.0.11 DT505010 - IBM WebSphere Application Server Liberty
range_unparsed *..<26.0.0.11 DT505097 - IBM WebSphere Application Server Liberty
< *..26.0.0.11
- IBM WebSphere Application Server Liberty
- Fixed in
- IBM WebSphere Application Server Liberty
26.0.0.12 - IBM WebSphere Application Server Liberty
26.0.0.11
- IBM WebSphere Application Server Liberty
Not sure whether and how you are affected? Ask a question about this vulnerability
Metrics
—
Priority
No value is available for this vulnerability.
—
CVSS v3
No value is available for this vulnerability.
—
EPSS score
No value is available for this vulnerability.
Show all metrics
- Severity
- High
Priority (0–325)
The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?
Read in glossary- 92.65 Methodology
Exploit maturity
An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.
Read in glossary- no public PoC known
KEV status
The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.
Read in glossary- —
- Published
Detection rules
No NEOSEC detection rule is available for this vulnerability yet.
Classification under NIS2 and CRA
Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.
NIS2
NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.
Read in glossary- High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
CRA
The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.
Read in glossary- From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001
ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.
Read in glossary- Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.
Description
A flaw was found in Hibernate Validator starting with version 5.4.1. This vulnerability allows an unauthenticated remote attacker to cause a Denial of Service (DoS) by submitting specially crafted input containing unescaped message parameters. Improper escaping allows user-supplied data to be re-evaluated during Expression Language (EL) processing, leading to excessive resource consumption and application unresponsiveness.
Source: redhat_csaf, BSI CSAF, BSI WID Portal
Affected products
The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.
| Affected versions | Fixed in | ||
|---|---|---|---|
| IBM | WebSphere Application Server Liberty |
|
|
Vendors and products
Included in the same advisory
| Medium | CVE-2026-94451 | Red Hat build of Quarkus 3.27.6.redhat: Improper Input Validation | 6.5 | — |
| High | CVE-2026-94449 | Red Hat build of Quarkus 3.27.6.redhat: Uncontrolled Resource Consumption | 7.5 | — |
| Medium | CVE-2026-93432 | Red Hat build of Quarkus 3.27.6.redhat: Cross-site Scripting | 6.1 | — |
| High | CVE-2026-91777 | jackson-databind: quadratic forward-reference completion in Collection and Map deserializers | 7.5 | — |
| High | CVE-2026-91776 | jackson-databind retains every unknown raw type ID | 7.5 | — |
| High | CVE-2026-89425 | FasterXML Jackson-core: Allocation of Resources Without Limits or Throttling | 7.5 | — |
| High | CVE-2026-89407 | jackson-core: ReDoS: quadratic backtracking in NumberInput.PATTERN_FLOAT via looksLikeValidNumber() | 7.5 | — |
| High | CVE-2026-89059 | Resteasy-core: resteasy: iioimageprovider unbounded image decode (decompression-bomb dos) | 7.5 | — |
| High | CVE-2026-89058 | Resteasy-core: resteasy: corsfilter reflects arbitrary origin with credentials under wildcard config | 7.4 | — |
| High | CVE-2026-88033 | MongoDB Java Driver: Improper Neutralization of Special Elements in Data Query Logic | 8.3 | — |
| High | CVE-2026-88032 | MongoDB Java Driver: Use After Free | 7.5 | — |
| Critical | CVE-2026-87744 | Red Hat build of Quarkus 3.27.6.redhat: Forced Browsing | 9.1 | — |
| Critical | CVE-2026-84939 | Apache FreeMarker: Relative Path Traversal | 9.1 | — |
| Medium | CVE-2026-83557 | FasterXML Jackson-databind: Deserialization of Untrusted Data | 5.6 | — |
| High | CVE-2026-71889 | PKIXCertPathReviewer does not apply X.509 name constraints to the target certificate | — | — |
| High | CVE-2026-68497 | jackson-databind: Duration XMLGregorianCalendar Unbounded Number Parse DoS | 7.5 | — |
| Medium | CVE-2026-59949 | Yawkat Lz4-java: NULL Pointer Dereference | 6.5 | — |
| Medium | CVE-2026-59296 | Micrometer StatsD and Logging meter registries line-protocol and log injection vulnerability | 5.9 | — |
| Medium | CVE-2026-59295 | Micrometer instrumentation of Apache HttpAsyncClient DoS vulnerability | 5.9 | — |
| Medium | CVE-2026-19032 | jackson-databind resolves attacker-controlled URI schemes when deserializing java.nio.file.Path | 5.3 | — |
Embed badge
Show the severity and KEV status of this vulnerability on your site – with a link back here. The image is updated hourly.
<a href="https://intel.neosec.eu/en/cve/CVE-2026-93879"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-93879.svg?lang=en" alt="CVE-2026-93879 – NEOSEC Intel" height="20"></a>