{"cve":"CVE-2026-48737","nvd":{"published":"2026-09-15T15:17:16.220","modified":"2026-09-16T17:17:18.907","status":"Deferred","description":"pyLoad is a free and open-source download manager written in Python. Prior to 0.5.0b3.dev101, is_global_address in src/pyload/core/utils/web/check.py relies on Python's global-address classification without examining IPv4 destinations embedded in 6to4 or NAT64 IPv6 addresses. A low-privileged user can submit an IPv6 literal through parse_urls to the pre-resolution is_global_host guard. Because host_to_ip is pinned to AF_INET, that guard does not evaluate a hostname's AAAA result. Separately, curl resolves hostnames before the pycurl PREREQFUNC in src/pyload/core/network/http/http_request.py applies the same vulnerable is_global_address check to the actual connection address, so a transition-form AAAA result can be permitted even when it terminates at an embedded loopback, private, CGNAT, or link-local IPv4 address. Exploitation requires the pyLoad host to route the applicable transition mechanism, including 6to4 on affected Python 3.9 through 3.11 deployments or NAT64 on a network with a NAT64 gateway. Successful exploitation can enable internal-network reconnaissance, timing-based confirmation, limited service disruption, or cloud metadata disclosure where the wrapped address is routable. This issue is fixed in version 0.5.0b3.dev101.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:L","score":4.9},"cwes":["CWE-918"],"references":["https://github.com/pyload/pyload/commit/ba7491046b2d430732be490913e4cbf1f1e899c2","https://github.com/pyload/pyload/security/advisories/GHSA-m5x5-28jr-gpjj","https://github.com/pyload/pyload/security/advisories/GHSA-m5x5-28jr-gpjj"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:53:43.293028046+00:00"},"epss":{"cve":"CVE-2026-48737","score":0.00289,"percentile":0.21499,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-m5x5-28jr-gpjj","url":"https://osv.dev/vulnerability/GHSA-m5x5-28jr-gpjj","summary":"pyLoad: SSRF guard bypass via IPv6 6to4/NAT64 transition wrappers of internal IPs","modified":"2026-07-13T16:42:40.050296621Z","packages":[{"ecosystem":"PyPI","name":"pyload-ng","purl":"pkg:pypi/pyload-ng","ranges":["<=0.5.0b3.dev100"],"fixed":[]}]},{"id":"PYSEC-2026-2995","url":"https://osv.dev/vulnerability/PYSEC-2026-2995","summary":"pyLoad: SSRF guard bypass via IPv6 6to4/NAT64 transition wrappers of internal IPs","modified":"2026-07-13T16:32:41.278577807Z","packages":[{"ecosystem":"PyPI","name":"pyload-ng","purl":"pkg:pypi/pyload-ng","ranges":["<=0.5.0b3.dev100"],"fixed":[]}]}],"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."]}