{"id":"CVE-2026-66913","state":"PUBLISHED","title":"Zip Bomb in Lookyloo Capture Upload Allows Denial of Service","description":"Lookyloo did not enforce limits on the decompressed size of uploaded capture archives and compressed HAR files.\n\nAn attacker could submit a specially crafted ZIP, gzip, or zlib-compressed capture containing data that expands to a very large size during processing. Because the application decompressed this content directly in memory without first limiting the output size, processing the malicious capture could exhaust available memory, terminate a web or worker process, or make the Lookyloo instance unavailable.\n\nThe vulnerability affects both full Lookyloo capture archive imports and API submissions containing gzip-compressed HAR data. Repeated exploitation could cause a persistent denial-of-service condition until the affected processes or instance are restarted.\n\nThe patch introduces:\n\n  *  A 1 GB cumulative uncompressed-size limit for imported capture archives.\n  *  Size-limited gzip and zlib decompression for compressed HAR files.\n  *  Explicit detection and handling of suspected zip bombs.\n  *  An HTTP 400 response when an oversized compressed HAR file is submitted through the API.","publishedAt":"2026-07-28T12:19:20.977Z","updatedAt":"2026-07-28T19:20:16.204Z","severity":{"score":6.9,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","source":"CIRCL"},"assigner":"CIRCL","products":["lookyloo lookyloo"],"affected":[{"vendor":"lookyloo","product":"lookyloo","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"1.40.0","versionType":"semver"}],"repo":"https://github.com/Lookyloo/lookyloo"}],"references":["https://github.com/Lookyloo/lookyloo/commit/96589da290f018e356db7c0eaddf1aa501630ca7"],"weaknesses":["CWE-400"],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/66xxx/CVE-2026-66913.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-66913","state":"PUBLISHED","datePublished":"2026-07-28T12:19:20.977Z","dateUpdated":"2026-07-28T19:20:16.204Z","assignerShortName":"CIRCL","assignerOrgId":"5a6e4751-2f3f-4070-9419-94fb35b644e8","dateReserved":"2026-07-28T12:19:10.431Z"},"containers":{"cna":{"title":"Zip Bomb in Lookyloo Capture Upload Allows Denial of Service","descriptions":[{"lang":"en","value":"Lookyloo did not enforce limits on the decompressed size of uploaded capture archives and compressed HAR files.\n\nAn attacker could submit a specially crafted ZIP, gzip, or zlib-compressed capture containing data that expands to a very large size during processing. Because the application decompressed this content directly in memory without first limiting the output size, processing the malicious capture could exhaust available memory, terminate a web or worker process, or make the Lookyloo instance unavailable.\n\nThe vulnerability affects both full Lookyloo capture archive imports and API submissions containing gzip-compressed HAR data. Repeated exploitation could cause a persistent denial-of-service condition until the affected processes or instance are restarted.\n\nThe patch introduces:\n\n  *  A 1 GB cumulative uncompressed-size limit for imported capture archives.\n  *  Size-limited gzip and zlib decompression for compressed HAR files.\n  *  Explicit detection and handling of suspected zip bombs.\n  *  An HTTP 400 response when an oversized compressed HAR file is submitted through the API."}],"affected":[{"vendor":"lookyloo","product":"lookyloo","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"1.40.0","versionType":"semver"}],"repo":"https://github.com/Lookyloo/lookyloo"}],"references":[{"url":"https://github.com/Lookyloo/lookyloo/commit/96589da290f018e356db7c0eaddf1aa501630ca7","tags":["patch"]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","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:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-400","description":"CWE-400 Uncontrolled Resource Consumption","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"CIRCL","orgId":"5a6e4751-2f3f-4070-9419-94fb35b644e8","dateUpdated":"2026-07-28T12:19:20.977Z"},"credits":[{"lang":"en","type":"remediation developer","value":"Raphael Vinot"},{"lang":"en","type":"finder","value":"https://github.com/EQSTLab"}],"impacts":[{"capecId":"CAPEC-490","descriptions":[{"lang":"en","value":"CAPEC-490 Amplification"}]}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 0.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-28T19:20:02.814342Z","id":"CVE-2026-66913","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-28T19:20:16.204Z"}}]}}}