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aiosmtplib: STARTTLS response injection

🗓️ 27 Aug 2026 23:32:22Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 16 Views

STARTTLS response injection in aiosmtplib before 5.1.2 via MiM buffered data surviving TLS boundary.

Related
Detection
Refs
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20 Aug 202614:29
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CVE-2026-55558 aiosmtplib: STARTTLS response injection
20 Aug 202614:29
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20 Aug 202614:29
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EUVD-2026-63376
27 Aug 202623:32
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20 Aug 202615:17
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28 Aug 202612:45
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28 Aug 202616:32
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CGA-RJ45-WWR4-6G8C
28 Aug 202611:40
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Vulners
Node
aiosmtplibRange5.1.1pip

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27 Aug 2026 23:32Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.15.9
EPSS0.00261
SSVC
16