UL 1998-3rd A1: V2G Devices Must Embed TLS 1.3 by Oct 2026

UL Solutions has issued Supplement A1 to UL 1998-3rd, mandating TLS 1.3 protocol stack implementation in all V2G-capable equipment—including onboard chargers (OBC), DC fast chargers, and BMS-integrated modules—effective October 1, 2026. This requirement directly impacts manufacturers supplying to the North American EV infrastructure market and signals a hardening of cybersecurity expectations for grid-connected mobility systems.

Event Overview

UL Solutions published Supplement A1 to the third edition of UL 1998 on April 26, 2026. The supplement requires that any device claiming vehicle-to-grid (V2G) functionality must integrate a Transport Layer Security (TLS) 1.3 protocol stack certified to FIPS 140-3 Level 2, and must pass audit of its cryptographic key lifecycle management. Compliance becomes mandatory for new certifications and product listings as of October 1, 2026.

Which Subsectors Are Affected

Direct Exporters to North America
Manufacturers based outside the U.S.—particularly those in China supplying V2G-enabled OBCs, DC charging stations, or integrated BMS modules—are affected because their products must meet this requirement to obtain UL listing for sale in the U.S. market. Non-compliant devices will not be eligible for UL certification post-October 2026, blocking market access.

Hardware Design & Firmware Development Firms
Companies responsible for firmware architecture and secure boot design face immediate engineering implications. The mandate necessitates integration of a FIPS 140-3 Level 2–validated TLS 1.3 stack—not just generic TLS support—which often requires replacing open-source SSL/TLS libraries (e.g., OpenSSL, Mbed TLS) with commercial or government-validated alternatives. This triggers full firmware revalidation cycles.

Certification & Compliance Service Providers
Third-party labs and compliance consultants supporting V2G product submissions must update test protocols to verify both TLS 1.3 implementation integrity and key lifecycle governance (e.g., key generation, storage, rotation, revocation). Audits now extend beyond functional interoperability into cryptographic assurance and supply-chain traceability of security components.

What Relevant Enterprises or Practitioners Should Focus On — And How to Respond

Confirm current TLS stack validation status against FIPS 140-3 Level 2

Assess whether existing implementations use libraries listed on the NIST Cryptographic Module Validation Program (CMVP) database. Open-source libraries commonly deployed today are generally not pre-validated; retrofitting requires either module recertification or substitution with an already-validated stack.

Plan for firmware re-spin and UL re-submission timelines

Based on the notice, Chinese V2G solution providers estimate 4–8 weeks of additional lead time for North American orders due to required firmware updates and new certificate issuance. Engineering, QA, and certification teams should align on revised project gates and allocate buffer time before Q3 2026 to avoid delivery delays.

Review supply chain dependencies for cryptographic modules

If sourcing TLS stacks from third-party IP vendors or silicon partners (e.g., MCU vendors offering secure enclave-based crypto), verify that their delivered modules carry active FIPS 140-3 Level 2 certificates—and confirm scope coverage includes TLS 1.3 handshake, cipher suites, and key management functions cited in UL 1998-3rd A1.

Editorial Observation / Industry Perspective

From industry perspective, this supplement is less a technical surprise and more a formalization of long-anticipated security baselines for bidirectional energy systems. Analysis来看, it reflects convergence between evolving NIST guidance (SP 800-175B), ISO 15118-20’s security annexes, and UL’s risk-based approach to embedded software safety. Observation来看, the October 2026 deadline suggests UL intends this as an enforceable compliance checkpoint—not merely advisory guidance. Current more appropriate understanding is that this marks the start of a multi-year tightening cycle, where future supplements may extend requirements to post-quantum cryptography readiness or hardware-rooted attestation.

Conclusion
UL 1998-3rd Supplement A1 establishes a concrete, date-bound cybersecurity threshold for V2G equipment entering the U.S. market. Its significance lies not only in the technical mandate but in its role as a signal: cybersecurity is no longer treated as a secondary feature in EV infrastructure—it is now a non-negotiable, auditable, and certifiable system property. For stakeholders, the event is best understood not as an isolated update, but as the first enforceable milestone in a broader regulatory maturation of grid-edge device security.

Information Sources
Primary source: UL Solutions official announcement and UL 1998-3rd Supplement A1 document, published April 26, 2026. No additional regulatory documents, draft standards, or enforcement guidance beyond this supplement have been confirmed at time of publication. Ongoing monitoring of UL’s Standards Roadmap and NIST CMVP updates is recommended for further developments.