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CVE-2026-55558 aiosmtplib: STARTTLS response injection

🗓️ 20 Aug 2026 14:29:58Reported by GitHub_MType 
cvelist
 cvelist
🔗 www.cve.org👁 31 Views

aiosmtplib before 5.1.2 vulnerable to STARTTLS response injection desynchronizing SMTP sessions.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
cgr
Chainguard
CVE-2026-55558 vulnerabilities
29 Aug 202608:25
cgr
circl
Circl
CVE-2026-55558
28 Aug 202600:31
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cve
CVE
CVE-2026-55558
20 Aug 202614:29
cve
debiancve
Debian CVE
CVE-2026-55558
20 Aug 202614:29
debiancve
euvd
EUVD
EUVD-2026-63376
27 Aug 202623:32
euvd
github
Github Security Blog
aiosmtplib: STARTTLS response injection
27 Aug 202623:32
github
nvd
NVD
CVE-2026-55558
20 Aug 202615:17
nvd
osv
OSV
CGA-9P76-84FG-HMGR
28 Aug 202612:45
osv
osv
OSV
CGA-RF5F-QJPG-QQHC
28 Aug 202616:32
osv
osv
OSV
CGA-RJ45-WWR4-6G8C
28 Aug 202611:40
osv
Rows per page
[
  {
    "vendor": "cole",
    "product": "aiosmtplib",
    "versions": [
      {
        "version": "< 5.1.2",
        "status": "affected"
      }
    ]
  }
]

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