FKIE_CVE-2026-50734
Vulnerability from fkie_nvd - Published: 2026-06-30 11:16 - Updated: 2026-07-02 18:40
Severity
Summary
Memory Allocation with Excessive Size Value vulnerability in Apache ActiveMQ Client, Apache ActiveMQ, Apache ActiveMQ All.
An unauthenticated network attacker can cause a broker DoS by sending a crafted WireFormatInfo frame with a malicious large size value. The value is not validate and causes the broker to attempt allocation during pre-auth negotiation which can trigger OOM and crash the broker.
This issue affects Apache ActiveMQ Client: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ All: before 5.19.8, from 6.0.0 before 6.2.7.
Users are recommended to upgrade to version 6.2.7 or 5.19.8, which fixes the issue.
References
| URL | Tags | ||
|---|---|---|---|
| security@apache.org | https://lists.apache.org/thread/nxso951fnvf72qf9m475mpz4yf931xk0 | Vendor Advisory, Mailing List | |
| af854a3a-2127-422b-91ae-364da2661108 | http://www.openwall.com/lists/oss-security/2026/06/29/10 | Third Party Advisory |
{
"affected": [
{
"affectedData": [
{
"collectionURL": "https://repo.maven.apache.org/maven2",
"defaultStatus": "unaffected",
"packageName": "org.apache.activemq:activemq-client",
"product": "Apache ActiveMQ Client",
"vendor": "Apache Software Foundation",
"versions": [
{
"lessThan": "5.19.8",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "6.2.7",
"status": "affected",
"version": "6.0.0",
"versionType": "semver"
}
]
},
{
"defaultStatus": "unaffected",
"packageName": "org.apache.activemq:apache-activemq",
"product": "Apache ActiveMQ",
"vendor": "Apache Software Foundation",
"versions": [
{
"lessThan": "5.19.8",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "6.2.7",
"status": "affected",
"version": "6.0.0",
"versionType": "semver"
}
]
},
{
"defaultStatus": "unaffected",
"packageName": "org.apache.activemq:activemq-all",
"product": "Apache ActiveMQ All",
"vendor": "Apache Software Foundation",
"versions": [
{
"lessThan": "5.19.8",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "6.2.7",
"status": "affected",
"version": "6.0.0",
"versionType": "semver"
}
]
}
],
"source": "security@apache.org"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:apache:activemq:*:*:*:*:*:*:*:*",
"matchCriteriaId": "BC66E480-8612-46E7-BAA6-EF589D66A4AD",
"versionEndExcluding": "5.19.8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:apache:activemq:*:*:*:*:*:*:*:*",
"matchCriteriaId": "74C2B373-AC03-4016-896A-E05B94D63004",
"versionEndExcluding": "6.2.7",
"versionStartIncluding": "6.0.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Memory Allocation with Excessive Size Value vulnerability in Apache ActiveMQ Client, Apache ActiveMQ, Apache ActiveMQ All.\n\nAn unauthenticated network attacker can cause a broker DoS by sending a crafted WireFormatInfo frame with a malicious large size value. The value is not validate and causes the broker to attempt allocation during pre-auth negotiation which can trigger OOM and crash the broker.\nThis issue affects Apache ActiveMQ Client: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ All: before 5.19.8, from 6.0.0 before 6.2.7.\n\nUsers are recommended to upgrade to version 6.2.7 or 5.19.8, which fixes the issue."
}
],
"id": "CVE-2026-50734",
"lastModified": "2026-07-02T18:40:36.210",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-50734",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-06-30T12:32:21.060414Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-06-30T11:16:29.827",
"references": [
{
"source": "security@apache.org",
"tags": [
"Vendor Advisory",
"Mailing List"
],
"url": "https://lists.apache.org/thread/nxso951fnvf72qf9m475mpz4yf931xk0"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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],
"url": "http://www.openwall.com/lists/oss-security/2026/06/29/10"
}
],
"sourceIdentifier": "security@apache.org",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-789"
}
],
"source": "security@apache.org",
"type": "Secondary"
}
]
}
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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