{"cve":"CVE-2026-40036","nvd":{"published":"2026-04-08T22:16:24.190","modified":"2026-10-08T16:17:14.887","status":"Analyzed","description":"Unfurl before 2026.04 contains an unbounded zlib decompression vulnerability in parse_compressed.py that allows remote attackers to cause denial of service. Attackers can submit highly compressed payloads via URL parameters to the /json/visjs endpoint that expand to gigabytes, exhausting server memory and crashing the service.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.7},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-409","CWE-770"],"references":["https://github.com/obsidianforensics/unfurl/releases/tag/v2026.04","https://github.com/obsidianforensics/unfurl/security/advisories/GHSA-h5qv-qjv4-pc5m","https://www.vulncheck.com/advisories/dfir-unfurl-denial-of-service-via-unbounded-zlib-decompression"],"products":["ryandfir:unfurl"],"source":"nvd","synced_at":"2026-10-19T22:28:59.047572785+00:00"},"epss":{"cve":"CVE-2026-40036","score":0.00508,"percentile":0.43116,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-h5qv-qjv4-pc5m","url":"https://osv.dev/vulnerability/GHSA-h5qv-qjv4-pc5m","summary":"Unfurl's unbounded zlib decompression allows decompression bomb DoS","modified":"2026-07-07T17:57:22.139143075Z","packages":[{"ecosystem":"PyPI","name":"dfir-unfurl","purl":"pkg:pypi/dfir-unfurl","ranges":["<20260405"],"fixed":["20260405"]}]},{"id":"PYSEC-2026-1294","url":"https://osv.dev/vulnerability/PYSEC-2026-1294","summary":"Unfurl's unbounded zlib decompression allows decompression bomb DoS","modified":"2026-07-07T17:46:33.818156092Z","packages":[{"ecosystem":"PyPI","name":"dfir-unfurl","purl":"pkg:pypi/dfir-unfurl","ranges":["<20260405"],"fixed":["20260405"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}