Description
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.
Published: 2026-02-21
Score: 4.7 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-49pc-8936-wvfp Lettermint Node.js SDK leaks email properties to unintended recipients when client instance is reused
History

Tue, 24 Feb 2026 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 24 Feb 2026 15:15:00 +0000

Type Values Removed Values Added
First Time appeared Lettermint lettermint
CPEs cpe:2.3:a:lettermint:lettermint:*:*:*:*:*:node.js:*:*
Vendors & Products Lettermint lettermint

Mon, 23 Feb 2026 15:00:00 +0000

Type Values Removed Values Added
First Time appeared Lettermint
Lettermint lettermint-node
Vendors & Products Lettermint
Lettermint lettermint-node

Sat, 21 Feb 2026 10:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Lettermint Node.js SDK leaks email properties to unintended recipients when client instance is reused
Weaknesses CWE-488
References
Metrics cvssV3_1

{'score': 4.7, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N'}


Subscriptions

Lettermint Lettermint Lettermint-node
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-02-24T18:08:44.011Z

Reserved: 2026-02-19T19:46:03.541Z

Link: CVE-2026-27492

cve-icon Vulnrichment

Updated: 2026-02-24T18:08:36.104Z

cve-icon NVD

Status : Analyzed

Published: 2026-02-21T11:15:57.287

Modified: 2026-02-24T15:00:44.600

Link: CVE-2026-27492

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-02-23T14:32:00Z

Weaknesses