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Bugzilla #1732484 Certificate Problem Report

Sectigo: Truncated registration numbers in EV certificates

RESOLVED FIXED Sectigo
AI Summary

Sectigo identified a truncation issue affecting some of its EV certificates, where the subject:serialNumber values were limited to 25 characters. This was discovered during an investigation prompted by a related issue reported by DigiCert. Affected certificates were issued between September 16, 2019, and July 13, 2021. Following the identification of the problem, Sectigo deployed a fix to allow for a maximum of 64 characters and scheduled revocation of the affected certificates. The revocation was successfully completed on September 25, 2021.

Model: gpt-4o-mini Generated: 2026-06-13 20:57 UTC Confidence: 1.00
Chronology
  1. DigiCert bug 1727963 reported.
  2. Code review reveals truncation issue.
  3. Fix deployed to prevent truncation.
  4. Scheduled revocation of affected certificates completed.
Participants
Tim Callan
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