Description
Solana Pay is a protocol and set of reference implementations that enable developers to incorporate decentralized payments into their apps and services. When a Solana Pay transaction is located using a reference key, it may be checked to represent a transfer of the desired amount to the recipient, using the supplied `validateTransfer` function. An edge case regarding this mechanism could cause the validation logic to validate multiple transfers. This issue has been patched as of version `0.2.1`. Users of the Solana Pay SDK should upgrade to it. There are no known workarounds for this issue.
Remediation
References
https://github.com/solana-labs/solana-pay/blob/master/SPEC.md#reference
https://github.com/solana-labs/solana-pay/blob/master/core/src/validateTransfer.ts
https://github.com/solana-labs/solana-pay/security/advisories/GHSA-j47c-j42c-mwqq
https://github.com/solana-labs/solana-pay/commit/ac6ce0d0a81137700874a8bf5a7caac3be999fad
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