Critical Alert 1 Active Exploit Detected Today

CVE-2026-76504 — Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability →
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October 1, 2026

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CVE-2026-3298NVD

Vulnerability Summary

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 write if data was larger than the buffer size. Non-Windows platforms are not affected.
Severity Level
UNKNOWN
Published Date
Apr 21, 2026
Last Modified
Aug 13, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.39%Probability
Root Weakness (CWE)
CWE-787: Unknown/Unlisted Weakness ↗
Refer to the official MITRE database for detailed architectural specifications regarding this weakness.
CVSS v4.0 Base Metrics — Score 8.8 (HIGH)
Attack VectorNetwork
Attack ComplexityLow
Attack RequirementsNone
Privileges RequiredNone
User InteractionNone
Confidentiality (Vulnerable System)Low
Integrity (Vulnerable System)Low
Availability (Vulnerable System)High
Confidentiality (Subsequent System)None
Integrity (Subsequent System)None
Availability (Subsequent System)None

Affected & Patched Versions

Affected Versions
  • Python Software Foundation CPython < 3.11.16
  • Python Software Foundation CPython >= 3.12.0 and < 3.12.14
  • Python Software Foundation CPython >= 3.13.0 and < 3.13.14
  • Python Software Foundation CPython >= 3.14.0a1 and < 3.14.5rc1
  • Python Software Foundation CPython >= 3.15.0a1 and < 3.15.0b1
Patched Versions
  • Python Software Foundation CPython 3.11.16
  • Python Software Foundation CPython 3.12.14
  • Python Software Foundation CPython 3.13.14
  • Python Software Foundation CPython 3.14.5rc1
  • Python Software Foundation CPython 3.15.0b1
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🎁7-Day Free Trial — Try Pro or Team, no card required.
📧Email Delivery — Threat intel straight to your inbox.
♾️Unlimited Vendors — Track your entire stack.
🚨All New CVEs — Be the first to know.
📈EPSS Spike Alerts — Catch rising risk before it peaks.
🎯Custom EPSS/CVSS — Filter noise, focus on risk.
🛡️Exploit Intel — A 2nd confirmed-exploit signal beyond KEV.
🐙GitHub Issues — Auto-tracked, no duplicates.
📬Weekly Digest — One clean summary, not inbox spam.
🏷️Watchlist Groups — Tag alerts by team (Infra/AppSec/SOC).
💬Webhooks — Slack & Teams integration.
🔀Smart Routing — Critical alerts to one channel, rest to another.
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External References