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cpython

CPython

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".

CVE-2026-1299 is a vulnerability identified in the Python Software Foundation's CPython implementation, specifically within the email module's BytesGenerator class. The vulnerability stems from improper handling of newlines in email headers during serialization, particularly when using the LiteralHeader class, which allows headers that do not conform to standard email folding rules. This improper quoting can lead to header injection, where an attacker can insert malicious or malformed headers into serialized email messages. Such injection can disrupt email parsing, potentially enabling spoofing, phishing, or bypassing security controls that rely on header integrity. The vulnerability affects CPython versions 3.11.0 through 3.15.0a1, including early alpha releases. The CVSS 4.0 score is 6.0 (medium severity), reflecting that the vulnerability can be exploited remotely without user interaction but requires low privileges and some authentication. The impact on confidentiality is low, but integrity and availability impacts are higher due to potential manipulation of email headers. The Python maintainers have introduced stricter validation in the BytesGenerator class to reject improperly folded headers, mitigating the issue. No public exploits have been reported yet, but the vulnerability's presence in widely used Python versions makes it a concern for applications relying on Python's email module for message serialization.

Detailed information about CVE-2026-1299: CWE-93 in Python Software Foundation CPython affecting Python Software Foundation CPython. Get real-time updates, tech

CVE-2026-1299: CWE-93 in Python Software Foundation CPython - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-1299: CWE-93 in Python Software Foundation CPython

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