Cloudflare · Cloud and hostingDec 5, 2025, 08:47 UTC

Body parsing change for a React Server Components fix causes 25-minute outage

MajorConfig changeUpdated 47d ago

Dec 5, 08:47 UTCDec 5, 09:12 UTC

Duration

25m

Impact

Major

Root cause

Config change

Cloudflare, 90 days

187 incidents

Affected

CDNWAFGlobal

Read the postmortem Status page

Lesson: Urgent security mitigations still need a staged rollout; speed of response is exactly when a global config push is most dangerous.

What happened

Configuration changes to body parsing logic, made to detect and mitigate an industry-wide React Server Components vulnerability, caused a portion of the network to fail for about 25 minutes. Not an attack.

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Full history

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Also caused by configuration change

All

MajorNov 4, 16:05 UTC

GitHub: Incident with Actions and Pageslasted 56m

NoticeOct 26, 10:30 UTC

UiPath: Cloud Robots (VM) experienced a partial outage affecting multiple regionslasted 0m

CriticalOct 21, 18:26 UTC

Snowflake: INC20000301lasted 5h 3m

CriticalOct 21, 14:03 UTC

E2B: Template builds failinglasted 3m

CriticalOct 20, 18:15 UTC

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MinorOct 8, 13:00 UTC

CircleCI: Elevated wait times for machine jobslasted 3h 35m