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CVE-2026-1299

Published Jan 23, 2026 CWE-93

Overview

CVE-2026-1299 is a known-severity vulnerability. It was published on January 23, 2026.

Technical Description

The

email module, specifically the "BytesGenerator" class, didn’t properly quote newlines for email headers when

serializing an email message allowing for header injection when an email

is serialized. This is only applicable if using "LiteralHeader" writing headers that don't respect email folding rules, the new behavior will reject the incorrectly folded headers in "BytesGenerator".

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Ref cve.org/CVERecord?id=CVE-2024-6923 GitHub github.com/python/cpython/commit/052e55e7d44718fe46cbba0ca995cb8fcc359413 GitHub github.com/python/cpython/commit/0a925ab591c45d6638f37b5e57796f36fa0e56d8 GitHub github.com/python/cpython/commit/7877fe424415bc4a13045e62a90a7277413d8cb9 GitHub github.com/python/cpython/commit/842ce19a0c0b58d61591e8f6a708c38db1fb94e4 GitHub github.com/python/cpython/commit/8cdf6204f4ae821f32993f8fc6bad0d318f95f36 GitHub github.com/python/cpython/commit/e417f05ad77a4c30ddc07f99e90fc0cef43e831a GitHub github.com/python/cpython/issues/144125 GitHub github.com/python/cpython/pull/144126 Ref mail.python.org/archives/list/[email protected]/thread/6ZZULGALJTITEAGEXLDJE2C6FORDXPBT/

Frequently Asked Questions

What is CVE-2026-1299?

CVE-2026-1299 is a known-severity vulnerability. It was published on January 23, 2026.

How severe is CVE-2026-1299?

CVSS score information is not yet available for this vulnerability. Check back as the CVE record is updated by NVD analysts.

How do I fix or remediate CVE-2026-1299?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-1299?

CyberStrike's AI-powered security agents can automatically detect CVE-2026-1299 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.

How CyberStrike Helps

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