Node.js CVE-2026-27492
MEDIUM
GHSA-49pc-8936-wvfp
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
3Blast Radius
ecosystem impact- 2 npm packages depend on lettermint (2 direct, 0 indirect)
Ecosystem-wide dependent count for version 1.5.1.
DescriptionGitHub Advisory
Lettermint Node.js SDK is the official Node.js SDK for Lettermint. In versions 1.5.0 and below, email properties (such as to, subject, html, text, and attachments) are not reset between sends when a single client instance is reused across multiple .send() calls. This can cause properties from a previous send to leak into a subsequent one, potentially delivering content or recipient addresses to unintended parties. Applications sending emails to different recipients in sequence - such as transactional flows like password resets or notifications - are affected. This issue has been fixed in version 1.5.1.
AnalysisAI
Email content leakage in Lettermint Node.js SDK versions 1.5.0 and below allows local authenticated users to intercept sensitive email data when a single client instance sends multiple messages, as email properties are not properly cleared between sends. Applications using transactional email flows with reused client instances risk exposing recipient addresses and message content to unintended parties. The vulnerability has been patched in version 1.5.1.
Technical ContextAI
Affects Lettermint. Lettermint Node.js SDK is the official Node.js SDK for Lettermint. In versions 1.5.0 and below, email properties (such as to, subject, html, text, and attachments) are not reset between sends when a single client instance is reused across multiple .send() calls. This can cause properties from a previous send to leak into a subsequent one, potentially delivering content or recipient addresses to unintended parties. Applications sending emails to different recipients in sequence — such as transact
RemediationAI
A vendor patch is available — apply it immediately. Fixed in version 1.5.1..
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External POC / Exploit Code
Leaving vuln.today