{"id":"CVE-2026-66913","aliases":["EUVD-2026-49768"],"status":"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.","severity":{"version":"4.0","score":6.9,"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00428,"percentile":0.37354,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-400"],"published":"2026-07-28T12:19:20Z","modified":"2026-10-28T02:31:09Z","products":[{"vendor":"lookyloo","product":"lookyloo"}],"references":[{"url":"https://github.com/Lookyloo/lookyloo/commit/96589da290f018e356db7c0eaddf1aa501630ca7","tags":["patch","fix"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66913.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-66913","tags":["advisory"]},{"url":"https://github.com/Lookyloo/lookyloo","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-66913","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.","status":"published","published":"2026-07-28T12:19:20.977Z","modified":"2026-07-28T19:20:16.204Z","cvss":[{"version":"4.0","score":6.9,"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","level":"medium","assessor":"cna"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:20:12.939084Z"}],"euvd":[{"id":"EUVD-2026-49768","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.","status":"published","published":"2026-07-28T12:19:20Z","modified":"2026-07-28T19:20:16Z","cvss":[{"version":"4.0","score":6.9,"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","level":"medium"}],"updated_at":"2026-11-02T18:02:30.59681Z"}],"nvd":[{"id":"CVE-2026-66913","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.","status":"published","published":"2026-07-28T13:19:06.53Z","modified":"2026-07-30T16:55:34.27Z","cvss":[{"version":"4.0","score":6.9,"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/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","level":"medium","assessor":"secondary"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:12:33.249634Z"}],"osv":[{"id":"CVE-2026-66913","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.","status":"published","published":"2026-07-28T12:19:20.977Z","modified":"2026-10-28T02:31:09.927317804Z","cvss":[{"version":"4.0","score":6.9,"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","level":"medium"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T15:45:14.46177Z"}]}}