{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-18929", "assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "state": "PUBLISHED", "assignerShortName": "CERT-PL", "dateReserved": "2026-08-05T10:48:31.029Z", "datePublished": "2026-08-18T09:11:38.105Z", "dateUpdated": "2026-08-18T09:11:38.105Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "shortName": "CERT-PL", "dateUpdated": "2026-08-18T09:11:38.105Z"}, "title": "Resource Exhaustion in Carbone", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-409", "description": "CWE-409 Improper handling of highly compressed data (data amplification)", "type": "CWE"}]}], "affected": [{"vendor": "Carbone", "product": "Carbone", "repo": "https://github.com/carboneio/carbone", "versions": [{"status": "affected", "version": "0", "lessThan": "3.8.2", "versionType": "semver"}, {"status": "affected", "version": "0", "lessThan": "4.26.3", "versionType": "semver"}, {"status": "affected", "version": "0", "lessThan": "5.4.4", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "Carbone is vulnerable to Denial of Service due to lack of protection against zip bombs when processing .docx files. The library uses yazl for zip decompression without validating entry sizes, allowing an attacker to supply a malicious .docx file containing a zip bomb that decompresses to a significantly larger size, causing excessive memory consumption and crashing the application server.\n\n\n\n\nThe issue was fixed in versions: 3.8.2, 4.26.3 and 5.4.4.\u00a0\u00a0The fix is available across all distribution types.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<div><div>Carbone is vulnerable to Denial of Service due to lack of protection against zip bombs when processing .docx files. The library uses yazl for zip decompression without validating entry sizes, allowing an attacker to supply a malicious .docx file containing a zip bomb that decompresses to a significantly larger size, causing excessive memory consumption and crashing the application server.</div><div><br></div><div>The issue was fixed in versions: 3.8.2, 4.26.3 and 5.4.4.&nbsp;&nbsp;<span>The fix is available across all distribution types.</span></div></div>"}]}], "tags": ["x_open-source"], "references": [{"url": "https://cert.pl/en/posts/2026/08/CVE-2026-18929", "tags": ["third-party-advisory"]}, {"url": "https://carbone.io/", "tags": ["product"]}, {"url": "https://github.com/carboneio/carbone/commit/eb9b4cff992cc1cb1a319d7fc0cbd09160dc214e", "tags": ["patch"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "LOW", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "MEDIUM", "baseScore": 6.9, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L"}}], "credits": [{"lang": "en", "value": "Miko\u0142aj D\u0105bek", "type": "finder"}, {"lang": "en", "value": "Kamil Solecki", "type": "finder"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.3"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Carbone", "repo": "https://github.com/carboneio/carbone", "vendor": "Carbone", "versions": [{"lessThan": "3.8.2", "status": "affected", "version": "0", "versionType": "semver"}, {"lessThan": "4.26.3", "status": "affected", "version": "0", "versionType": "semver"}, {"lessThan": "5.4.4", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "cvd@cert.pl"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Carbone is vulnerable to Denial of Service due to lack of protection against zip bombs when processing .docx files. The library uses yazl for zip decompression without validating entry sizes, allowing an attacker to supply a malicious .docx file containing a zip bomb that decompresses to a significantly larger size, causing excessive memory consumption and crashing the application server.\n\n\n\n\nThe issue was fixed in versions: 3.8.2, 4.26.3 and 5.4.4.\u00a0\u00a0The fix is available across all distribution types."}], "id": "CVE-2026-18929", "lastModified": "2026-08-18T10:16:46.023", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.9, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "ACTIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "cvd@cert.pl", "type": "Secondary"}]}, "published": "2026-08-18T10:16:46.023", "references": [{"source": "cvd@cert.pl", "url": "https://carbone.io/"}, {"source": "cvd@cert.pl", "url": "https://cert.pl/en/posts/2026/08/CVE-2026-18929"}, {"source": "cvd@cert.pl", "url": "https://github.com/carboneio/carbone/commit/eb9b4cff992cc1cb1a319d7fc0cbd09160dc214e"}], "sourceIdentifier": "cvd@cert.pl", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-409"}], "source": "cvd@cert.pl", "type": "Primary"}]}

{}

{"created": "2026-08-18T10:30:10.755864+00:00", "updated": "2026-08-18T10:30:10.755876+00:00", "vendors": [], "weaknesses": ["CWE-409"]}