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VulnerabilityCVE-2026-92596Published 2026-09-16

CVE-2026-92596 — nodemailer

high

As of 2026-09-17, CVE-2026-92596 is a HIGH-severity vulnerability in nodemailer, CVSS v3.1 7.5. No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-92596 as of 2026-09-17; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

CVSS v3.1
7.5/10High
EPSS
—No EPSS score yet
CISA KEV
NoNot in the KEV catalog
Tracked threats
0None linked yet
Priority
3.8/10Threadlinqs triage score
Published
Updated 2026-09-17
CVSS v3.1 7.5 (HIGH) · CVSS v4.0 8.7 · Priority 3.8/10 · Published 2026-09-16

Last updated:

What is CVE-2026-92596?

Nodemailer before 9.1.0 contains a quadratic time complexity vulnerability in the addressparser component that allows remote attackers to cause denial of service by supplying a crafted comma-separated address list. Attackers can send a single email with a large number of addresses to block the Node.js event loop for extended periods, consuming 100% CPU and freezing the process.

The record classifies CVE-2026-92596 under weakness class CWE-400. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 19 days ago.

Severity and exploitation probability

CVSS v3.1 base score
7.5 — HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0 base score
8.7
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
3.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-09-16, last modified 2026-09-17

Is CVE-2026-92596 being exploited?

It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.

Affected products and versions

  • nodemailer: nodemailer

How to fix CVE-2026-92596

No vendor patch reference has been recorded for CVE-2026-92596 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-92596

No threat campaign in the Threadlinqs corpus currently references CVE-2026-92596, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

Sources

Enriched from CVE.org, NVD. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Vendor advisory and patch

Third-party advisory