What’s Vulnerable › Vulnerabilities

CVE-2024-6923: Email header injection due to unquoted newlines

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-08-01 · updated 2026-06-17
• Weakness: CWE-94

Description

There is a MEDIUM severity vulnerability affecting CPython. The email module didn’t properly quote newlines for email headers when serializing an email message allowing for header injection when an email is serialized.

Affected products

• Python Cpython: through 3.13.0rc2

References

• https://github.com/python/cpython/commit/06f28dc236708f72871c64d4bc4b4ea144c50147
• https://github.com/python/cpython/commit/097633981879b3c9de9a1dd120d3aa585ecc2384
• https://github.com/python/cpython/commit/4766d1200fdf8b6728137aa2927a297e224d5fa7
• https://github.com/python/cpython/commit/4aaa4259b5a6e664b7316a4d60bdec7ee0f124d0
• https://github.com/python/cpython/commit/b158a76ce094897c870fb6b3de62887b7ccc33f1
• https://github.com/python/cpython/commit/f7be505d137a22528cb0fc004422c0081d5d90e6
• https://github.com/python/cpython/commit/f7c0f09e69e950cf3c5ada9dbde93898eb975533
• https://github.com/python/cpython/issues/121650
• https://github.com/python/cpython/pull/122233
• https://mail.python.org/archives/list/security-announce@python.org/thread/QH3BUOE2DYQBWP7NAQ7UNHPPOELKISRW/
• http://www.openwall.com/lists/oss-security/2024/08/01/3
• http://www.openwall.com/lists/oss-security/2024/08/02/2

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