{"id":"CVE-2026-48737","title":"pyLoad is a free and open-source download manager written in Python","summary":"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 em…","severity":"medium","cvss":4.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:L","cwe":["CWE-918"],"vendor":"pyload","product":"pyload","affected":["pyload < 0.5.0b3.dev101"],"published":"2026-09-15","updated":"2026-09-16","sourceUpdated":"2026-09-16T17:17:18.907","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-48737","references":[{"url":"https://github.com/pyload/pyload/commit/ba7491046b2d430732be490913e4cbf1f1e899c2","label":"security-advisories@github.com"},{"url":"https://github.com/pyload/pyload/security/advisories/GHSA-m5x5-28jr-gpjj","label":"security-advisories@github.com"},{"url":"https://github.com/pyload/pyload/security/advisories/GHSA-m5x5-28jr-gpjj","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://github.com/advisories/GHSA-m5x5-28jr-gpjj"}],"tags":["nvd","cve.org","ghsa","pip","exploit-available"],"aliases":["GHSA-m5x5-28jr-gpjj"],"ecosystem":"pip","exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-16T16:04:41.559990Z"},"ingestedAt":"2026-07-09T13:51:05.216Z","epss":0.00181,"epssPercentile":0.0795,"slug":"CVE-2026-48737","body":"## Overview\n\npyLoad 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-48737)\n\nAffected packages:\n\n- `pyload-ng <= 0.5.0b3.dev100`\n\nSource: https://github.com/advisories/GHSA-m5x5-28jr-gpjj","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":27,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":205588,"id":"CVE-2026-48737","ts":1789578066070,"field":"exploit_available","old":"false","new":"true"}]}