CVE-2025-22868VulnerabilityPublished 5 May 2025Updated 25 Oct 2026

Red Hat Security Advisory: multicluster Engine for Kubernetes 2.5.9 container updates

Affects Red HatSource GCVE Database

Mentioned vulnerabilities

CVE-2025-30204

Not known to be exploited : upgrade to 2.5.9 soon.

Data as of 25 Oct 2026, 22:09 UTC

Severity

High

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.8% chance of exploitation in 30 days – higher than 58% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 2.5.9

Exploitation evidence

Disclosed: evidence found.
CVE published 5 May 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Red Hat to 2.5.9.

Affected software

Product	Affected	Fixed in
Red Hat Product Security Red Hat	Affected >=2.5.0 <2.5.9 Red Hat multicluster engine for Kubernetes multicluster engine for Kubernetes 2.5 for RHEL 9 multicluster engine for Kubernetes 2.5 for RHEL 8 amd64	Fixed in 2.5.9

AI-suggested

Red Hat has released updated container images in multicluster Engine for Kubernetes version 2.5.9 that fix these vulnerabilities. Users should upgrade to version 2.5.9 or later to remediate the issues. Refer to Red Hat's official documentation for installation instructions. No additional mitigations are specified in the advisory.

Description

multicluster engine for Kubernetes v2.5.9 images multicluster engine for Kubernetes provides the foundational components that are necessary for the centralized management of multiple Kubernetes-based clusters across data centers, public clouds, and private clouds. You can use the engine to create new Red Hat OpenShift Container Platform clusters or to bring existing Kubernetes-based clusters under management by importing them. After the clusters are managed, you can use the APIs that are provided by the engine to distribute configuration based on placement policy. Security fix(es): * golang.org/x/oauth2/jws: Unexpected memory consumption during token parsing in golang.org/x/oauth2/jws (CVE-2025-22868) * golang-jwt/jwt: jwt-go allows excessive memory allocation during header parsing (JWT) (CVE-2025-30204)

Impact

The vulnerabilities can cause excessive memory consumption when parsing tokens or JWT headers, potentially leading to denial of service by exhausting system resources. This impacts the stability and availability of the multicluster Engine for Kubernetes when processing authentication tokens.

Summary

The multicluster Engine for Kubernetes versions before 2.5.9 contain vulnerabilities in third-party libraries used for token parsing: CVE-2025-22868 in golang.org/x/oauth2/jws causes unexpected memory consumption during token parsing, and CVE-2025-30204 in golang-jwt/jwt allows excessive memory allocation during JWT header parsing. These flaws could lead to denial of service conditions due to resource exhaustion. Red Hat's advisory RHSA-2025:4473 provides updated container images in version 2.5.9 that address these issues.

CWE-1286Improper Validation of Syntactic Correctness of Input (opens in a new tab)
Base weakness
The product receives input that is expected to be well-formed - i.e., to comply with a certain syntax - but it does not validate or incorrectly validates that the input complies with the syntax.
Implementation · Input Validation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
Attack patterns
SQL Injection (opens in a new tab)
NoSQL Injection (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-405Asymmetric Resource Consumption (Amplification) (opens in a new tab)
Class weakness
The product does not properly control situations in which an adversary can cause the product to consume or produce excessive resources without requiring the adversary to invest equivalent work or otherwise prove authorization, i.e., the adversary's influence is "asymmetric."
Architecture and Design
An application must make resources available to a client commensurate with the client's access level.
Architecture and Design
An application must, at all times, keep track of allocated resources and meter their usage appropriately.
System Configuration
Consider disabling resource-intensive algorithms on the server side, such as Diffie-Hellman key exchange.
OWASP Cheat Sheets
File Upload (opens in a new tab)
OWASP ASVS 4.0.3
V12.1.1 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 14 Aug 2026, 22:04 UTC

WeaknessesCWE-1286, CWE-405

Technical details

References

Community reviews

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