PST fail-closed + protobuf compatibility fix

F-CEDAR-PST-ERRORCONSTRAINT-001

Public snapshot: 8 Oct 2026. Status, releases and attribution belong to each source below; none is inferred from another record.

Recorded evidence

—score not recorded

cedar-policy/cedarReported fixcedar-policy/cedar

PST fail-closed + protobuf compatibility fix

fixed publicly

details

Finding IDs: F-CEDAR-PST-ERRORCONSTRAINT-001
Status: fixed publicly
Reported via: security contact
Note: public fixes #2246 and #2247 merged on 2026-03-23. AWS stated no customer action was required because the affected paths needed two experimental flags enabled together and were not used in AWS authorization paths.

F-CEDAR-PST-ERRORCONSTRAINT-001: Access control. Serialization widens an invalid policy constraint to match all actions. Reviewed 24 Sep 2026. Mechanism assessed by 1seal.

Mechanism source for F-CEDAR-PST-ERRORCONSTRAINT-001

Security area (1seal assessment): Semantics. Serialization changes an invalid action constraint into a match-all constraint, so the decoded policy no longer means the original policy. The experimental-feature and deployment limits remain in the record. Reviewed 24 Sep 2026.

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