Detections
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SCA: security update for MimeKit (GHSA-g7hc-96xr-gvvx)

medium Tenable Cloud Security Plugin ID 438422

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - MimeKit is a C# library which may be used for the creation and parsing of messages using the Multipurpose
 Internet Mail Extension (MIME), as defined by numerous IETF specifications. Prior to version 4.15.1, a
 CRLF injection vulnerability in MimeKit allows an attacker to embed \r\n into the SMTP envelope address
 local-part (when the local-part is a quoted-string). This is non-compliant with RFC 5321 and can result in
 SMTP command injection (e.g., injecting additional RCPT TO / DATA / RSET commands) and/or mail header
 injection, depending on how the application uses MailKit/MimeKit to construct and send messages. The issue
 becomes exploitable when the attacker can influence a MailboxAddress (MAIL FROM / RCPT TO) value that is
 later serialized to an SMTP session. RFC 5321 explicitly defines the SMTP mailbox local-part grammar and
 does not permit CR (13) or LF (10) inside Quoted-string (qtextSMTP and quoted-pairSMTP ranges exclude
 control characters). SMTP commands are terminated by <CRLF>, making CRLF injection in command arguments
 particularly dangerous. This issue has been patched in version 4.15.1. (CVE-2026-30227)

See Also

https://github.com/advisories/GHSA-g7hc-96xr-gvvx

Plugin Details

Severity: Medium

ID: 438422

Version: Revision 1.8

Type: Local

Family: SCA Checks

Published: 3/6/2026

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS Score Source: CVE-2026-30227

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 6.9

Threat Score: 5.5

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/5/2026

Vulnerability Publication Date: 3/5/2026

Reference Information

CVE: CVE-2026-30227

cwe: CWE-93