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Github Security Blog
Github Security Blog
added 2026/08/20 9:34 p.m.15 views

Mailpit: SMTP DATA line reader buffers over-limit input before size enforcement

Summary Mailpit's SMTP DATA reader enforces the configured MaxMessageSize only after bufio.Reader.ReadBytes'\n' has already buffered a complete DATA line. A remote unauthenticated SMTP client can send one line larger than the configured message-size cap and force memory allocation before Mailpit...

5.3CVSS5.9AI score0.00451EPSS
SaveExploits0References5Affected Software1
NVD
NVD
added 2026/08/20 9:17 p.m.18 views

CVE-2026-67445

Mailpit is an email testing tool and API for developers. Prior to 1.30.4, Mailpit reads SMTP commands through internal/smtpd/smtpd.go session.readLine using bufio.Reader.ReadString before session.parseLine parses the verb or the RFC 5321 512-octet command-line limit is enforced. An unauthenticate...

5.3CVSS0.00379EPSS
SaveExploits0References3
Cvelist
Cvelist
added 2026/08/20 9:15 p.m.40 views

CVE-2026-67447 Mailpit: SMTP DATA line reader buffers over-limit input before size enforcement

Mailpit is an email testing tool and API for developers. From 1.30.0 until 1.30.5, Mailpit's internal/smtpd/smtpd.go readData function calls bufio.Reader.ReadBytes before applying the lendata+lenline size check to the completed SMTP DATA line against Server.MaxSize. An unauthenticated SMTP client...

5.3CVSS0.00451EPSS
SaveExploits0References3
EUVD
EUVD
added 2026/08/20 9:15 p.m.18 views

EUVD-2026-63664

Mailpit is an email testing tool and API for developers. From 1.30.0 until 1.30.5, Mailpit's internal/smtpd/smtpd.go readData function calls bufio.Reader.ReadBytes before applying the lendata+lenline size check to the completed SMTP DATA line against Server.MaxSize. An unauthenticated SMTP client...

5.3CVSS5.3AI score0.00451EPSS
SaveExploits0References3
CVE
CVE
added 2026/08/20 9:15 p.m.32 views

CVE-2026-67447

Mailpit (email testing tool) versions 1.30.0–1.30.4 contain a post-fix gap in the SMTP DATA reader (internal/smtpd/smtpd.go, readData()). The function calls bufio.Reader.ReadBytes('\n') before enforcing the configured MaxMessageSize cap, so a single oversized DATA line is fully allocated in memor...

5.3CVSS5.3AI score0.00451EPSS
SaveExploits0References3
OSV
OSV
added 2026/08/20 9:15 p.m.15 views

CVE-2026-67447 Mailpit: SMTP DATA line reader buffers over-limit input before size enforcement

Mailpit is an email testing tool and API for developers. From 1.30.0 until 1.30.5, Mailpit's internal/smtpd/smtpd.go readData function calls bufio.Reader.ReadBytes before applying the lendata+lenline size check to the completed SMTP DATA line against Server.MaxSize. An unauthenticated SMTP client...

5.3CVSS5.5AI score
SaveExploits0References5
CVE
CVE
added 2026/08/20 9:13 p.m.31 views

CVE-2026-67445

In Mailpit versions prior to 1.30.4, the SMTP command reader in internal/smtpd/smtpd.go uses bufio.Reader.ReadString before enforcing the RFC 5321 512-octet limit, allowing an unauthenticated remote attacker to send oversized command lines (including auth continuation lines) and exhaust memory, r...

5.3CVSS5.6AI score0.00379EPSS
SaveExploits0References3
Cvelist
Cvelist
added 2026/08/20 9:13 p.m.42 views

CVE-2026-67445 Mailpit: SMTP command parser buffers unbounded command lines before syntax rejection

Mailpit is an email testing tool and API for developers. Prior to 1.30.4, Mailpit reads SMTP commands through internal/smtpd/smtpd.go session.readLine using bufio.Reader.ReadString before session.parseLine parses the verb or the RFC 5321 512-octet command-line limit is enforced. An unauthenticate...

5.3CVSS0.00379EPSS
SaveExploits0References3
OSV
OSV
added 2026/08/20 9:13 p.m.14 views

CVE-2026-67445 Mailpit: SMTP command parser buffers unbounded command lines before syntax rejection

Mailpit is an email testing tool and API for developers. Prior to 1.30.4, Mailpit reads SMTP commands through internal/smtpd/smtpd.go session.readLine using bufio.Reader.ReadString before session.parseLine parses the verb or the RFC 5321 512-octet command-line limit is enforced. An unauthenticate...

5.3CVSS5.8AI score
SaveExploits0References5
OSV
OSV
added 2026/08/20 6:34 p.m.16 views

GHSA-H58C-XCCX-75M3 Coder: Stored HTML injection via unescaped ApplicationName and LogoURL appearance settings

Summary The ApplicationName and LogoURL appearance settings were rendered into HTML output without sufficient escaping which let a highly privileged Owner-role user inject HTML into the Coder dashboard and SMTP notification emails. Note: Exploitation requires the Owner role which already holds fu...

3.4CVSS5.5AI score
SaveExploits0References8
OSV
OSV
added 2026/08/20 3:17 p.m.10 views

DEBIAN-CVE-2026-55558

aiosmtplib is an asynchronous SMTP client for use with asyncio. Prior to 5.1.2, SMTPProtocol.starttls in src/aiosmtplib/protocol.py consumes the server's 220 response and starts the TLS handshake without clearing SMTPProtocol.buffer. An active network attacker can place attacker-chosen SMTP...

5.9CVSS5.6AI score0.00261EPSS
SaveExploits0References1
OSV
OSV
added 2026/08/20 3:17 p.m.10 views

UBUNTU-CVE-2026-55558

aiosmtplib is an asynchronous SMTP client for use with asyncio. Prior to 5.1.2, SMTPProtocol.starttls in src/aiosmtplib/protocol.py consumes the server's 220 response and starts the TLS handshake without clearing SMTPProtocol.buffer. An active network attacker can place attacker-chosen SMTP...

5.9CVSS5.9AI score0.00261EPSS
SaveExploits0References2
UbuntuCve
UbuntuCve
added 2026/08/20 3:17 p.m.13 views

CVE-2026-55558

aiosmtplib is an asynchronous SMTP client for use with asyncio. Prior to 5.1.2, SMTPProtocol.starttls in src/aiosmtplib/protocol.py consumes the server's 220 response and starts the TLS handshake without clearing SMTPProtocol.buffer. An active network attacker can place attacker-chosen SMTP...

5.9CVSS5.9AI score0.00261EPSS
SaveExploits0References1
Cvelist
Cvelist
added 2026/08/20 2:29 p.m.35 views

CVE-2026-55558 aiosmtplib: STARTTLS response injection

aiosmtplib is an asynchronous SMTP client for use with asyncio. Prior to 5.1.2, SMTPProtocol.starttls in src/aiosmtplib/protocol.py consumes the server's 220 response and starts the TLS handshake without clearing SMTPProtocol.buffer. An active network attacker can place attacker-chosen SMTP...

5.9CVSS0.00261EPSS
SaveExploits0References3
CVE
CVE
added 2026/08/20 2:29 p.m.57 views

CVE-2026-55558

CVE-2026-55558 affects aiosmtplib , an asynchronous SMTP client for Python's asyncio, in versions prior to 5.1.2 . The vulnerability resides in SMTPProtocol.start_tls (src/aiosmtplib/protocol.py), which consumes the server's 220 response and initiates the TLS handshake without clearing SMTPProtoc...

5.9CVSS5.3AI score0.00261EPSS
SaveExploits0References3
Chainguard
Chainguard
added 2026/08/20 2:17 a.m.46 views

CVE-2026-40686 vulnerabilities

Vulnerabilities for packages: exim...

5.3CVSS5.2AI score0.00246EPSS
SaveExploits0
Chainguard
Chainguard
added 2026/08/20 2:17 a.m.38 views

CVE-2026-66140 vulnerabilities

Vulnerabilities for packages: exim...

8.4CVSS5.1AI score0.00255EPSS
SaveExploits0
Chainguard
Chainguard
added 2026/08/20 2:17 a.m.44 views

CVE-2026-66141 vulnerabilities

Vulnerabilities for packages: exim...

7.8CVSS5.1AI score0.00103EPSS
SaveExploits0
Chainguard
Chainguard
added 2026/08/20 2:17 a.m.42 views

GHSA-Q496-Q274-JGH9 vulnerabilities

Vulnerabilities for packages: exim...

5.3AI score
SaveExploits0
Chainguard
Chainguard
added 2026/08/20 2:17 a.m.34 views

GHSA-F965-GHFW-X6JX vulnerabilities

Vulnerabilities for packages: exim...

5.3AI score
SaveExploits0
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