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Critical Python Vulnerabilities Affect Multiple Versions

Critical Python Vulnerabilities Affect Multiple Versions

First seen 20 Apr 2026, 05:43 UTC • •

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ThreatCluster AI
ThreatCluster •April 21, 2026 at 04:59 UTC
  • •Multiple Python versions (3.10, 3.12, 3.15) have critical vulnerabilities requiring immediate attention.
  • •CVE-2026-1502 and CVE-2026-6100 are among the most severe vulnerabilities, allowing for significant exploitation.
  • •Patches have been released, but systems remain at risk until updates are applied.

Recent security updates for Python 3.10, 3.12, and 3.15 address critical vulnerabilities impacting various systems. Key vulnerabilities include CVE-2026-1502, which allows HTTP header injection, and CVE-2026-6100, which can lead to arbitrary code execution. These vulnerabilities affect multiple distributions, including Ubuntu 22.04 and Fedora 42 and 43. The vulnerabilities were published between March 4 and April 13, 2026, with patches released shortly after. Systems using these Python versions are at risk if not updated promptly. The updates include fixes for logging bypass and stack overflow issues as well. Security teams are urged to apply the updates to mitigate potential exploitation risks. The situation remains critical as attackers may exploit these vulnerabilities before widespread patch adoption.

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Timeline

2026-03-04
CVE-2026-2297 published
2026-03-16
CVE-2026-4224 and CVE-2026-3644 published
2026-03-18
CVE-2026-3479 published
2026-03-20
CVE-2026-4519 published
2026-04-10
CVE-2026-1502 published
2026-04-13
CVE-2026-6100 published
2026-04-13
CVE-2026-4786 published
2026-04-19
Security updates announced for Fedora 43
2026-04-20
Security updates announced for Ubuntu 22.04

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