PT-2026-33988 · Python · Python

Ggautomaton + 2 · Published 2026-04-21 · Updated 2026-04-27 · CVE-2026-3298

Positive Technologies (AI Summary)

CVSS v4.0

8.8

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions Python (affected versions not specified)

Description The sock recvfrom into() method of asyncio.ProacterEventLoop on Windows lacks a boundary check for the data buffer when the nbytes parameter is used. This can lead to an out-of-bounds buffer write if the received data exceeds the buffer size.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

RCE

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

BIT-LIBPYTHON-2026-3298

BIT-PYTHON-2026-3298

BIT-PYTHON-MIN-2026-3298

CVE-2026-3298

PSF-2026-20

Affected Products

Python

References · 19

• https://github.com/python/cpython/commit/27522b7d6e6588f03e61099dd858cd5a9314e2f2 · Patch
• https://github.com/python/cpython/commit/1274766d3c29007ab77245a72abbf8dce2a9db4d · Patch
• https://github.com/python/cpython/commit/95633d2aad4721e25e4dfd9f43dfb6e1edcbd741 · Patch
• https://github.com/python/cpython/pull/148809 · Patch
• https://mail.python.org/archives/list/[e-mail]/thread/KWTPIQBOOOUNQP7UFSLBI437NJDFLA3F · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-3298 · Security Note
• https://osv.dev/vulnerability/BIT-python-2026-3298 · Vendor Advisory
• https://osv.dev/vulnerability/BIT-libpython-2026-3298 · Vendor Advisory
• https://osv.dev/vulnerability/BIT-python-min-2026-3298 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-3298 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-3298 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-3298 · Vendor Advisory
• https://osv.dev/vulnerability/PSF-0000-CVE-2026-3298 · Vendor Advisory
• https://osv.dev/vulnerability/PSF-2026-20 · Vendor Advisory
• https://github.com/python/cpython/issues/148808 · Note