CVE-2026-110872
SMTP reply parsing DoS in Nodemailer blocks Node.js event loop.
Is CVE-2026-110872 being exploited?
Not confirmed. CVE-2026-110872 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.29% probability of exploitation in the next 30 days.
How severe is CVE-2026-110872?
CVE-2026-110872 is rated High with a CVSS score of 8.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-110872?
Yes. A fix has been recorded for CVE-2026-110872. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-110872 affect?
CVE-2026-110872 affects Nodemailer 3.0.0 - 10.0.9, Node.js applications using Nodemailer SMTP transport. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-110872?
Upgrade Nodemailer to >=10.0.10; restrict/trust SMTP endpoints and enforce connection/response timeouts.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Malicious SMTP server or on-path attacker can stream replies to block the Node.js event loop and exhaust memory, causing application/service DoS.
Patch when possible
- affected>= 3.0.0 and < 10.0.10
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.