Security context
What an agent needs to avoid regressing past fixes and find the next vuln in this repo.
zeromq/pyzmq
main @ 7082443
11
Fixes
0
CVEs
CRITICAL
Peak severity
Highlights
Denial of Service: 8 prior fixes. Scrutinize any change in this area.
zmq/backend/cython/socket.pyx: most-fixed (2 issues). Treat as high-risk during review.
3 high-severity fixes in this history; regressions here are high-impact.
Recurring patterns
The bug types that recur here, drawn from past fixes, not open vulnerabilities.
Denial of Service: Unhandled index errors when parsing invalid or short ZeroMQ Authentication Protocol (ZAP) messages can crash the authentication handler, causing a complete denial of service for new connections. This is particularly critical as it resides on the untrusted authentication interface.
Integer Overflow: The use of 32-bit integers to track buffer shapes can lead to overflow vulnerabilities when processing large payloads. Upgrading types to Py_ssize_t in Cython wrappers is critical to ensuring memory safety on 64-bit platforms.
Auth Bypass: Race conditions in configuring ThreadAuthenticator rules can allow incoming connections to bypass authentication checks if rules are not synchronously acknowledged by the background thread before the configuration call returns.