FKIE_CVE-2026-20338
Vulnerability from fkie_nvd - Published: 2026-08-07 17:17 - Updated: 2026-08-11 18:54
Severity
Summary
A vulnerability in the zip archive parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device.
This vulnerability is due to improper memory handling when processing content in zip files during scanning. An attacker could exploit this vulnerability by submitting a crafted zip file for scanning. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate as a result of a memory double-free, resulting in a DoS condition on the affected software.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unknown",
"product": "Cisco Secure Endpoint",
"vendor": "Cisco",
"versions": [
{
"status": "affected",
"version": "7.0.5"
},
{
"status": "affected",
"version": "6.2.19"
},
{
"status": "affected",
"version": "7.3.3"
},
{
"status": "affected",
"version": "7.2.13"
},
{
"status": "affected",
"version": "6.1.5"
},
{
"status": "affected",
"version": "6.3.1"
},
{
"status": "affected",
"version": "6.2.5"
},
{
"status": "affected",
"version": "7.3.5"
},
{
"status": "affected",
"version": "6.2.1"
},
{
"status": "affected",
"version": "7.2.7"
},
{
"status": "affected",
"version": "7.1.1"
},
{
"status": "affected",
"version": "6.3.5"
},
{
"status": "affected",
"version": "6.2.9"
},
{
"status": "affected",
"version": "7.3.1"
},
{
"status": "affected",
"version": "6.1.7"
},
{
"status": "affected",
"version": "7.2.11"
},
{
"status": "affected",
"version": "7.2.3"
},
{
"status": "affected",
"version": "7.1.5"
},
{
"status": "affected",
"version": "6.3.3"
},
{
"status": "affected",
"version": "7.3.9"
},
{
"status": "affected",
"version": "6.2.3"
},
{
"status": "affected",
"version": "6.1.9"
},
{
"status": "affected",
"version": "6.0.9"
},
{
"status": "affected",
"version": "7.2.5"
},
{
"status": "affected",
"version": "6.0.7"
},
{
"status": "affected",
"version": "6.3.7"
},
{
"status": "affected",
"version": "1.12.3"
},
{
"status": "affected",
"version": "1.8.0"
},
{
"status": "affected",
"version": "1.11.1"
},
{
"status": "affected",
"version": "1.12.4"
},
{
"status": "affected",
"version": "1.10.0"
},
{
"status": "affected",
"version": "1.12.0"
},
{
"status": "affected",
"version": "1.8.1"
},
{
"status": "affected",
"version": "1.10.1"
},
{
"status": "affected",
"version": "1.12.1"
},
{
"status": "affected",
"version": "1.12.6"
},
{
"status": "affected",
"version": "1.14.0"
},
{
"status": "affected",
"version": "1.10.2"
},
{
"status": "affected",
"version": "1.12.7"
},
{
"status": "affected",
"version": "1.12.2"
},
{
"status": "affected",
"version": "1.6.0"
},
{
"status": "affected",
"version": "1.9.0"
},
{
"status": "affected",
"version": "1.11.0"
},
{
"status": "affected",
"version": "1.7.0"
},
{
"status": "affected",
"version": "1.13.0"
},
{
"status": "affected",
"version": "1.8.4"
},
{
"status": "affected",
"version": "1.13.1"
},
{
"status": "affected",
"version": "1.9.1"
},
{
"status": "affected",
"version": "1.12.5"
},
{
"status": "affected",
"version": "1.13.2"
},
{
"status": "affected",
"version": "8.1.7.21512"
},
{
"status": "affected",
"version": "8.1.7"
},
{
"status": "affected",
"version": "8.1.5"
},
{
"status": "affected",
"version": "8.1.3.21242"
},
{
"status": "affected",
"version": "8.1.3"
},
{
"status": "affected",
"version": "8.1.5.21322"
},
{
"status": "affected",
"version": "8.1.7.21417"
},
{
"status": "affected",
"version": "1.14.1"
},
{
"status": "affected",
"version": "1.15.1"
},
{
"status": "affected",
"version": "1.15.2"
},
{
"status": "affected",
"version": "1.15.3"
},
{
"status": "affected",
"version": "1.15.4"
},
{
"status": "affected",
"version": "1.15.5"
},
{
"status": "affected",
"version": "1.15.6"
},
{
"status": "affected",
"version": "1.16.0"
},
{
"status": "affected",
"version": "1.16.1"
},
{
"status": "affected",
"version": "1.16.2"
},
{
"status": "affected",
"version": "1.16.3"
},
{
"status": "affected",
"version": "1.18.0"
},
{
"status": "affected",
"version": "1.18.1"
},
{
"status": "affected",
"version": "1.20.0"
},
{
"status": "affected",
"version": "1.21.0"
},
{
"status": "affected",
"version": "1.21.1"
},
{
"status": "affected",
"version": "1.21.2"
},
{
"status": "affected",
"version": "1.21.3"
},
{
"status": "affected",
"version": "1.22.0"
},
{
"status": "affected",
"version": "1.22.1"
},
{
"status": "affected",
"version": "1.22.2"
},
{
"status": "affected",
"version": "1.22.3"
},
{
"status": "affected",
"version": "1.22.4"
},
{
"status": "affected",
"version": "1.24.0"
},
{
"status": "affected",
"version": "1.24.1"
},
{
"status": "affected",
"version": "1.24.2"
},
{
"status": "affected",
"version": "1.24.3"
},
{
"status": "affected",
"version": "1.24.4"
},
{
"status": "affected",
"version": "1.26.0"
},
{
"status": "affected",
"version": "1.24.5"
},
{
"status": "affected",
"version": "1.26.1"
},
{
"status": "affected",
"version": "1.27.0"
},
{
"status": "affected",
"version": "1.15.0"
},
{
"status": "affected",
"version": "1.17.0"
},
{
"status": "affected",
"version": "1.17.1"
},
{
"status": "affected",
"version": "1.17.2"
},
{
"status": "affected",
"version": "1.19.0"
},
{
"status": "affected",
"version": "1.20.1"
},
{
"status": "affected",
"version": "1.20.2"
},
{
"status": "affected",
"version": "1.20.3"
},
{
"status": "affected",
"version": "1.20.4"
},
{
"status": "affected",
"version": "1.20.5"
},
{
"status": "affected",
"version": "1.20.6"
},
{
"status": "affected",
"version": "1.23.0"
},
{
"status": "affected",
"version": "1.23.1"
},
{
"status": "affected",
"version": "1.20.7"
},
{
"status": "affected",
"version": "1.20.8"
},
{
"status": "affected",
"version": "1.25.0"
},
{
"status": "affected",
"version": "1.25.1"
},
{
"status": "affected",
"version": "1.25.2"
},
{
"status": "affected",
"version": "1.27.1"
},
{
"status": "affected",
"version": "1.27.2"
},
{
"status": "affected",
"version": "7.3.13"
},
{
"status": "affected",
"version": "7.3.15"
},
{
"status": "affected",
"version": "7.4.1"
},
{
"status": "affected",
"version": "7.4.1.20425"
},
{
"status": "affected",
"version": "7.4.1.20439"
},
{
"status": "affected",
"version": "7.4.3"
},
{
"status": "affected",
"version": "7.4.3.20679"
},
{
"status": "affected",
"version": "7.4.5"
},
{
"status": "affected",
"version": "7.5.1.20813"
},
{
"status": "affected",
"version": "7.5.1.20833"
},
{
"status": "affected",
"version": "7.5.3"
},
{
"status": "affected",
"version": "7.5.5"
},
{
"status": "affected",
"version": "8.0.1.21160"
},
{
"status": "affected",
"version": "8.0.1.21164"
},
{
"status": "affected",
"version": "7.5.7"
},
{
"status": "affected",
"version": "7.5.9"
},
{
"status": "affected",
"version": "7.5.11"
},
{
"status": "affected",
"version": "8.1.7.21585"
},
{
"status": "affected",
"version": "7.5.13.21586"
},
{
"status": "affected",
"version": "7.5.13.21598"
},
{
"status": "affected",
"version": "8.2.1.21612"
},
{
"status": "affected",
"version": "8.2.1.21650"
},
{
"status": "affected",
"version": "7.5.15.21611"
},
{
"status": "affected",
"version": "7.5.17.21680"
},
{
"status": "affected",
"version": "8.2.3.30119"
},
{
"status": "affected",
"version": "8.2.4.30130"
},
{
"status": "affected",
"version": "8.4.0"
},
{
"status": "affected",
"version": "7.5.19"
},
{
"status": "affected",
"version": "8.4.1.30298"
},
{
"status": "affected",
"version": "8.4.2.30317"
},
{
"status": "affected",
"version": "8.4.1.30307"
},
{
"status": "affected",
"version": "7.5.20"
},
{
"status": "affected",
"version": "8.4.3"
},
{
"status": "affected",
"version": "8.4.4.30419"
},
{
"status": "affected",
"version": "8.4.4.30467"
},
{
"status": "affected",
"version": "7.5.21.21732"
},
{
"status": "affected",
"version": "8.4.5.30483"
}
]
}
],
"source": "psirt@cisco.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the zip archive parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device.\r\n\r\nThis vulnerability is due to improper memory handling when processing content in zip files during scanning. An attacker could exploit this vulnerability by submitting a crafted zip file for scanning. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate as a result of a memory double-free, resulting in a DoS condition on the affected software."
}
],
"id": "CVE-2026-20338",
"lastModified": "2026-08-11T18:54:19.877",
"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": "psirt@cisco.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-20338",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-07T18:12:05.989495Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-08-07T17:17:02.610",
"references": [
{
"source": "psirt@cisco.com",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-WuuvVd26"
}
],
"sourceIdentifier": "psirt@cisco.com",
"vulnStatus": "Awaiting Analysis",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-415"
}
],
"source": "psirt@cisco.com",
"type": "Secondary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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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