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CVE-2026-55558: Improper Neutralization of Special Elements in Output Used by a Downstream Component

🗓️ 20 Aug 2026 00:00:00Reported by Rapid7Type 
rapid7
 rapid7
🔗 www.rapid7.com👁 3 Views

aiosmtplib <5.1.2 SMTPProtocol.start_tls fails to clear buffer, causing desynchronization.

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Refs
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cgr
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CVE-2026-55558 vulnerabilities
29 Aug 202608:25
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circl
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CVE-2026-55558
28 Aug 202600:31
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cve
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CVE-2026-55558
20 Aug 202614:29
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cvelist
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CVE-2026-55558 aiosmtplib: STARTTLS response injection
20 Aug 202614:29
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debiancve
Debian CVE
CVE-2026-55558
20 Aug 202614:29
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euvd
EUVD
EUVD-2026-63376
27 Aug 202623:32
–euvd
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
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osv_cga
osv_cga
CGA-9P76-84FG-HMGR
28 Aug 202612:45
–osv_cga
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18 Sep 2026 00:00Current
6Medium risk
Vulners AI Score6
CVSS 3.15.9
EPSS0.00403
SSVC
3