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EUVD-2026-63376

🗓️ 27 Aug 2026 23:32:22Reported by EUVDType 
euvd
 euvd
🔗 euvd.enisa.europa.eu👁 24 Views

aiosmtplib before 5.1.2 leaks pre-TLS SMTP response bytes causing response desynchronization via STARTTLS.

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
–circl
cve
CVE
CVE-2026-55558
20 Aug 202614:29
–cve
cvelist
Cvelist
CVE-2026-55558 aiosmtplib: STARTTLS response injection
20 Aug 202614:29
–cvelist
debiancve
Debian CVE
CVE-2026-55558
20 Aug 202614:29
–debiancve
github
Github Security Blog
aiosmtplib: STARTTLS response injection
27 Aug 202623:32
–github
mend
Mend
CVE-2026-55558
20 Aug 202614:29
–mend
nvd
NVD
CVE-2026-55558
20 Aug 202615:17
–nvd
osv_cga
osv_cga
CGA-9P76-84FG-HMGR
28 Aug 202612:45
–osv_cga
osv_cga
osv_cga
CGA-RF5F-QJPG-QQHC
28 Aug 202616:32
–osv_cga
Rows per page
[
  {
    "enisaIdVendor": [
      {
        "id": "8e966296-72e8-3778-8f0c-4ac0cd0ede7c",
        "vendor": {
          "name": "cole"
        }
      }
    ],
    "enisaIdProduct": [
      {
        "id": "2974e554-9d04-3fd1-aa44-c37757ee95b0",
        "product": {
          "name": "aiosmtplib",
          "vendor": {
            "name": "cole"
          }
        },
        "product_version": "< 5.1.2"
      }
    ]
  }
]

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27 Aug 2026 23:32Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.15.9
EPSS0.00403
SSVC
24