high severityConfidence mediumHistorical record

OpenSSL CMS decrypt writes past the unwrap buffer

OpenSSL CMS decrypt unwrap heap overflow. Upgrade to the patched release.

Also tracked as CVE-2026-63072

First observed

Aug 25, 2026

Last observed

Aug 25, 2026

Last reviewed

Sep 20, 2026

Tracking ended

Aug 25, 2026

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Uncertainty and limitations

Read the evidence limits before acting on this record.

Confirm exact fixed version against the live advisory.

  • Campaign tracks CVE-2026-63072 only.
  • HOL blog is operator guidance.

Timeline

Reviewed events, oldest first, each tied to a verified source.

  1. Disclosure

    CVE-2026-63072 OpenSSL CMS decrypt heap overflow disclosed.

  2. Update

    HOL Guard published operator coverage.

Publication clock: 643.0 hours from reviewed disclosure timestamp to HOL publication; 24-hour high target; historical backfill outside target.

Guard coverage and non-coverage

What Guard's reviewed coverage assertions do and do not claim for this campaign.

No Guard coverage mapping is published for this record.

Defensive policy guidance

Reviewed starting points for defending against this campaign's artifact classes.

No campaign-specific policy guidance is published.

Sources

Every claim on this record is traceable to the sources below.

Reviewed in full by HOL Guard Security Publishing.

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Last full review
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Record HGTC-2026-F4E79004.