CLAIM-2026-09-28-03
Rollout of the runtime fix began 4 September 2026 at 23:15 UTC and completed 7 September 2026 at 06:13 UTC; all pre-mitigation cached snapshots were cleared by 19 September 2026 at 15:03 UTC.
Why it matters
Anything your sandboxes wrote before 7 September sat on unmitigated storage; snapshots were only fully cleared on 19 September.
Sources
- cloudflare2026how