CVE-2026-5713: Out-of-bounds read/write during remote profiling and asyncio process introspection when connecting to malicious target

Vulnerability summary

CVE-2026-5713 is a medium (CVSS 5.3) Stack-based Buffer Overflow vulnerability in python software foundation cpython. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.8% of scored vulnerabilities.

Timeline

1. 14-04-2026
   PublishedVulnerability first disclosed.
2. 31-07-2026
   Last modifiedVulnerability information updated.

Description

The "profiling.sampling" module (Python 3.15+) and "asyncio introspection capabilities" (3.14+, "python -m asyncio ps" and "python -m asyncio pstree") features could be used to read and write addresses in a privileged process if that process connected to a malicious or "infected" Python process via the remote debugging feature. This vulnerability requires persistently and repeatedly connecting to the process to be exploited, even after the connecting process crashes with high likelihood due to ASLR.

• CWE-121Stack-based Buffer OverflowThe product writes past the end of a buffer that was allocated on the stack.
• CWE-125Out-of-bounds ReadThe product reads data past the end, or before the beginning, of the intended buffer.