reject malformed ReplaceOp payloads without a panic

F-COSIGN-003

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

sigstore/cosign #4653Security PRsigstore/cosign

reject malformed ReplaceOp payloads without a panic

merged

details

Finding IDs: F-COSIGN-003
Status: merged
Disclosure date: 22 Jan 2026
Note: researcher-authored PR by @1seal, merged as c836f7a753724815eb5721ddaa227163971c12c0. Replaces an unchecked string assertion with validation and adds regression tests. This is an authored security contribution, not a separately confirmed CVE or a vendor-authored fix. Release inclusion was not independently checked.
PR opened by: @1seal
PR state observed: closed; GitHub merged: true; 2026-09-24
PR observation basis: Public PR metadata recorded in the 2026-09-24 evidence audit; not a live status feed.
Contribution boundary: @1seal opened this PR; this alone does not establish sole code authorship.

F-COSIGN-003: Input / state handling. Malformed replacement operations reach an unchecked type assertion. Reviewed 24 Sep 2026. Mechanism assessed by 1seal.

Mechanism source for F-COSIGN-003

Security area (1seal assessment): Availability. An unchecked type assertion on a malformed replacement payload can terminate the operation with a panic. Reviewed 23 Sep 2026.

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