avoid ciphertext-sized stack allocation in CMS decryption

F-NITRO-CMS-001

Public snapshot: 26 Sep 2026. Status, releases and attribution belong to each source below; none is inferred from another record.

Recorded evidence

—score not recorded

aws/aws-nitro-enclaves-sdk-cReported fixaws/aws-nitro-enclaves-sdk-c

avoid ciphertext-sized stack allocation in CMS decryption

fixed in public source; rollout not reverified

details

Finding IDs: F-NITRO-CMS-001
Status: fixed in public source; rollout not reverified
Disclosure date: 13 Feb 2026
Note: aws_cms_cipher_decrypt replaces a variable-length stack array with heap allocation, error handling and cleanup. This matches the reported stack-exhaustion path, not the separate IV-length finding. Release inclusion and deployed consumers were not independently checked.

F-NITRO-CMS-001: Resource limits. Ciphertext size controls an unbounded stack allocation. Reviewed 24 Sep 2026. Mechanism assessed by 1seal.

Mechanism source for F-NITRO-CMS-001

Security area (1seal assessment): Availability. A ciphertext-sized stack allocation can exhaust the stack during decryption. Reviewed 23 Sep 2026.

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