CVE-2026-48737

pyLoad (pyload-ng), a Python-based open-source download manager, has an SSRF guard bypass (CWE-918) in its is_global_address function. The guard relies on Python's ipaddress.IPv6Address.is_global, which classifies 6to4 (2002::/16) and NAT64 (64:ff9b::/96) transition prefixes as globally routable ...

CVE-2026-48737 pyLoad: SSRF guard bypass via IPv6 6to4/NAT64 transition wrappers of internal IPs

pyLoad is a free and open-source download manager written in Python. Prior to 0.5.0b3.dev101, isglobaladdress 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...

CVE-2026-48737 pyLoad: SSRF guard bypass via IPv6 6to4/NAT64 transition wrappers of internal IPs

pyLoad is a free and open-source download manager written in Python. Prior to 0.5.0b3.dev101, isglobaladdress 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...

CVE-2026-48987: Uncontrolled Resource Consumption

pyLoad is a free and open-source download manager written in Python. Prior to 0.5.0b3.dev101, EventManager in src/pyload/core/managers/eventmanager.py appends a Client object to the clients list for each unique uuid submitted to the authenticated getEvents API endpoint, but getevents does not...

CVE-2026-48737: Server-Side Request Forgery (SSRF)

pyLoad is a free and open-source download manager written in Python. Prior to 0.5.0b3.dev101, isglobaladdress 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...

pyLoad: Unbounded Memory Growth Leading to DoS and Potential DDoS in EventManager

Description:The EventManager module in pyload manages a list of Client instances for subscribing to events. The addition of each unique uuid from the getevents API causes the creation of a Client instance that gets appended to the clients list. Although there is a clean method available in the...

PYSEC-2026-2995 pyLoad: SSRF guard bypass via IPv6 6to4/NAT64 transition wrappers of internal IPs

Summary isglobaladdress in src/pyload/core/utils/web/check.py is the central guard against SSRF-style outbound connections in pyload-ng. It tests whether a given IP is "globally routable" via Python's ipaddress.ipaddressvalue.isglobal, and callers treat not isglobal as "deny": python def...

PYSEC-2026-2992 pyLoad: Unbounded Memory Growth Leading to DoS and Potential DDoS in EventManager

Description: The EventManager module in pyload manages a list of Client instances for subscribing to events. The addition of each unique uuid from the getevents API causes the creation of a Client instance that gets appended to the clients list. Although there is a clean method available in the...

pyLoad is vulnerable to stored XSS in Downloads view via unsanitized link URL in packages.js template literal

SummaryThe packages.js template at src/pyload/webui/app/themes/modern/templates/js/packages.js:172 interpolates a stored link URL into a template literal inside single-quoted HTML and then writes the result to the DOM via $div.htmlhtml. No escaping runs between the API value and innerHTML. An...

PYSEC-2026-2998 pyLoad Has Incomplete Fix for CVE-2026-33509 -storage_folder Bypass via Session Directory in pyLoad

Summary The fix for CVE-2026-33509 prevents setting storagefolder inside PKGDIR or userdir, but does NOT protect the Flask session directory /tmp/pyLoad/flask. An authenticated attacker can set storagefolder to the session directory and download session files of other users via /files/get/, leadi...

pyLoad Has Incomplete Fix for CVE-2026-33509 -storage_folder Bypass via Session Directory in pyLoad

SummaryThe fix for CVE-2026-33509 prevents setting storagefolder inside PKGDIR or userdir, but does NOT protect the Flask session directory /tmp/pyLoad/flask. An authenticated attacker can set storagefolder to the session directory and download session files of other users via /files/get/, leadin...

PyLoad vulnerable to unauthenticated traceback disclosure via global exception handler in WebUI

Summarypyload-ng WebUI returns full Python traceback details to clients on unhandled exceptions.Because /web/ is reachable without authentication and renders attacker-controlled template names, an unauthenticated user can reliably trigger a server exception for example by requesting a non-existen...

PYSEC-2026-2993 PyLoad vulnerable to unauthenticated traceback disclosure via global exception handler in WebUI

Summary pyload-ng WebUI returns full Python traceback details to clients on unhandled exceptions. Because /web/ is reachable without authentication and renders attacker-controlled template names, an unauthenticated user can reliably trigger a server exception for example by requesting a...

pyLoad has Stale Session Privilege After Role/Permission Change (Privilege Revocation Bypass)

SummarypyLoad caches role and permission in the session at login and continues to authorize requests using these cached values, even after an admin changes the user's role/permissions in the database.As a result, an already logged-in user can keep old revoked privileges until logout/session expir...

PYSEC-2026-2990 pyLoad has Stale Session Privilege After Role/Permission Change (Privilege Revocation Bypass)

Summary pyLoad caches role and permission in the session at login and continues to authorize requests using these cached values, even after an admin changes the user's role/permissions in the database. As a result, an already logged-in user can keep old revoked privileges until logout/session...

PYSEC-2026-2997 pyload-ng has a WebUI JSON permission mismatch that lets ADD/DELETE users invoke MODIFY-only actions

Summary Several WebUI JSON endpoints enforce weaker permissions than the core API methods they invoke. This allows authenticated low-privileged users to execute MODIFY operations that should be denied by pyLoad's own permission model. Confirmed mismatches: - ADD user can reorder packages/files...

pyLoad: Unprotected storage_folder enables arbitrary file write to Flask session store and code execution (Incomplete fix for CVE-2026-33509)

SummaryThe fix for CVE-2026-33509 GHSA-r7mc-x6x7-cqxx added an ADMINONLYOPTIONS set to block non-admin users from modifying security-critical config options. The storagefolder option is not in this set and passes the existing path restriction because the Flask session directory is outside both...

PYSEC-2026-2988 pyLoad: SSRF in parse_urls API endpoint via unvalidated URL parameter

Vulnerability Details CWE-918: Server-Side Request Forgery SSRF The parseurls API function in src/pyload/core/api/init.py line 556 fetches arbitrary URLs server-side via geturlurl pycurl without any URL validation, protocol restriction, or IP blacklist. An authenticated user with ADD permission...

pyLoad: SSRF in parse_urls API endpoint via unvalidated URL parameter

Vulnerability DetailsCWE-918: Server-Side Request Forgery SSRFThe parseurls API function in src/pyload/core/api/init.py line 556 fetches arbitrary URLs server-side via geturlurl pycurl without any URL validation, protocol restriction, or IP blacklist. An authenticated user with ADD permission can...

pyLoad SETTINGS Permission Users Can Achieve Remote Code Execution via Unrestricted Reconnect Script Configuration

SummaryThe setconfigvalue API endpoint allows users with the non-admin SETTINGS permission to modify any configuration option without restriction. The reconnect.script config option controls a file path that is passed directly to subprocess.run in the thread manager's reconnect logic. A SETTINGS...