CVE-2026-27492: Lettermint Node.js SDK is the official Node.js SDK for Lettermint

Routine

MEDIUM 4.7UPGRADE

CVE-2026-27492 is a medium-severity flaw (CVSS 4.7) affecting lettermint. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 d

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.7 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-488
Published	2026-02-21
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: lettermint

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-21 11:15 UTCPublished CVE record published
2026-06-17 10:27 UTCUpdated Record last modified

lettermint lettermint UPGRADE

Affected: < 1.5.1

Fixed in: 1.5.1

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls lettermint

2. UPGRADE to 1.5.1

npm install lettermint@">=1.5.1"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-27492?

lettermint: upgrade to 1.5.1. Exact commands for each OS are on this page.

Is CVE-2026-27492 being exploited?

CVE-2026-27492 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-27492 affect?

CVE-2026-27492 affects lettermint. Severity is medium (CVSS 4.7). 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 m

How urgent is CVE-2026-27492?

Priority 19/100. No elevated risk signals yet.

Software pages

Node.js vulnerabilities

References

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