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AZL-75234 CVE-2026-1299 affecting package python3 for versions less than 3.12.9-9

🗓️ 23 Jan 2026 17:16:12Reported by GoogleType 
osv
 osv🔗 osv.dev👁 12 Views

Python email BytesGenerator fails to quote newlines in headers, enabling header injection with LiteralHeader.

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ATTACKERKB		CVE-2026-1299
23 Jan 202616:27
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nessus
Tenable Nessus		Amazon Linux 2023 : python3.13, python3.13-devel, python3.13-freethreading (ALAS2023-2026-1437)
19 Feb 202600:00
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Tenable Nessus		Amazon Linux 2023 : python3.12, python3.12-devel, python3.12-idle (ALAS2023-2026-1444)
19 Feb 202600:00
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Tenable Nessus		Amazon Linux 2023 : python3.11, python3.11-devel, python3.11-idle (ALAS2023-2026-1447)
6 Mar 202600:00
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Tenable Nessus		Amazon Linux 2023 : python3, python3-devel, python3-idle (ALAS2023-2026-1583)
13 Apr 202600:00
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08 Sep 2026 17:33Current
7High risk
Vulners AI Score7
CVSS 46
EPSS0.00544
SSVC
Python emailBytesGeneratorLiteralHeaderheader injectionserializationnewlines
12