CVE catalog

CVE-2026-3298

The method "sock_recvfrom_into()" of "asyncio.ProacterEventLoop" (Windows only) was missing a boundary check for the data buffer when using nbytes parameter. This allowed for an out-of-bounds buffer w

[CVE catalog]

Severity: High · CVSS 8.8CVSS:4.0/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
Published: Apr 21, 2026, 3:16:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.39% · Oct 25, 2026

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	python3.11	bookworm	`3.11.2-6+deb12u8`	not affected
Debian	python3.11	bookworm-security	`3.11.2-6+deb12u9`	not affected
Cpe	python3.11	Not reported	Not reported	not affected

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	python3.11	source	bookworm	`Not affected`	unimportant	Not reported	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[idle-python3.11]Not affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · all · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · all · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · all · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · all · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
[libpython3.11]Not affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
[libpython3.11-dbg]Not affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
[libpython3.11-dev]Not affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
[libpython3.11-minimal]Not affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
[libpython3.11-stdlib]Not affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
[libpython3.11-testsuite]Not affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · all · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · all · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · all · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · all · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
[python3.11]Not affected
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
[python3.11-dbg]Not affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
[python3.11-dev]Not affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
[python3.11-doc]Not affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · all · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · all · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · all · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · all · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
[python3.11-examples]Not affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · all · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · all · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · all · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · all · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
[python3.11-full]Not affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
[python3.11-minimal]Not affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
[python3.11-nopie]Not affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
[python3.11-venv]Not affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Not affected
  nvd · python3.11 · debian · bookworm

Observed: Oct 23, 2026, 10:32:33 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database]