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CVE-2026-110869

HIGH 8.7

Published 2026-10-14 · Last modified 2026-10-15

Nodemailer 3.0.0 before 10.0.13 has a regular expression denial of service in SMTPConnection._actionEHLO, whose four AUTH mechanism detection regexes contain overlapping whitespace sub-patterns that backtrack quadratically. A malicious or man-in-the-middle SMTP server can reply to EHLO with 250-AUTH, a long whitespace run and a non-matching token, blocking the Node.js event loop for tens of seconds to hours before authentication.

ELEVATED IMPACT

Severe if exploited (CVSS 8.7), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

0.4%chance of exploitation in 30 days · 30th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

8.7CVSS 4.0 · HIGH

  • ConfidentialityNone
  • IntegrityNone
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable
  • ✓Requirements: No special attack requirements

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Nodemailer

Products Nodemailer

Weakness (CWE)

  • CWE-1333: Inefficient Regular Expression Complexity

CVSS vector

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

References and research data (JSON)

Vendor product assessments

  • ansible-automation-platform/bootc-automation-portal-rhel9 as a component of Self-service automation portal 2 · known affected

    Vendor assessment for this product only.

    pkg:oci/bootc-automation-portal-rhel9@sha256:8553c734145775879bdfe2befa9f2df1c22c6d7db2f2251401c3cc517a7e0394?repository_url=registry.redhat.io/ansible-automation-platform/bootc-automation-portal-rhel9

    • workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. The upstream fix is available in nodemailer 10.0.13 and later; updates for affected Red Hat products that bundle nodemailer are being pursued through the respective product teams.
    • none available: Affected
    Red Hat · CVE-2026-110869 · Updated 2026-10-23T17:24:08+00:00
  • rhdh/rhdh-hub-rhel9 as a component of Red Hat Developer Hub · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not in execute path

    pkg:oci/rhdh-hub-rhel9@sha256:0f02ae0b8405912741a180af1c290feac2003e69d062bec9c7cd5d13f8732dc9?repository_url=registry.redhat.io/rhdh/rhdh-hub-rhel9

    Red Hat · CVE-2026-110869 · Updated 2026-10-23T17:24:08+00:00
  • grafana as a component of Red Hat Enterprise Linux 10 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/grafana

    Red Hat · CVE-2026-110869 · Updated 2026-10-23T17:24:08+00:00
  • grafana-selinux as a component of Red Hat Enterprise Linux 10 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/grafana-selinux

    Red Hat · CVE-2026-110869 · Updated 2026-10-23T17:24:08+00:00
  • grafana.src as a component of Red Hat Enterprise Linux 10 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/grafana?arch=src

    Red Hat · CVE-2026-110869 · Updated 2026-10-23T17:24:08+00:00
  • grafana12.4.src as a component of Red Hat Hardened Images · known not affected

    Vendor assessment for this product only.

    Reason: component not present

    pkg:rpm/redhat/[email protected]?arch=src

    Red Hat · CVE-2026-110869 · Updated 2026-10-23T17:24:08+00:00
  • grafana13.1.src as a component of Red Hat Hardened Images · known not affected

    Vendor assessment for this product only.

    Reason: component not present

    pkg:rpm/redhat/[email protected]?arch=src

    Red Hat · CVE-2026-110869 · Updated 2026-10-23T17:24:08+00:00
  • grafana13.2.src as a component of Red Hat Hardened Images · known not affected

    Vendor assessment for this product only.

    Reason: component not present

    pkg:rpm/redhat/[email protected]?arch=src

    Red Hat · CVE-2026-110869 · Updated 2026-10-23T17:24:08+00:00

All CVSS metrics

  • HIGH 8.7 v4.0 · CNA Primary
    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
  • HIGH 7.5 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • HIGH 8.7 v4.0 · NVD Secondary
    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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  • HIGH 7.5 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Exploit-tagged references (not proof of a PoC)

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS