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GO-2025-3447

Timing sidechannel for P-256 on ppc64le in crypto/internal/nistec

Quick fix

GO-2025-3447 — stdlib: upgrade to the fixed version with the command below.

go get stdlib@v1.22.12

Details

Due to the usage of a variable time instruction in the assembly implementation of an internal function, a small number of bits of secret scalars are leaked on the ppc64le architecture. Due to the way this function is used, we do not believe this leakage is enough to allow recovery of the private key when P-256 is used in any well known protocols.

Are you affected?

Enter the version of the package you're using.

Affected packages

Go / stdlib

Introduced in: 0 Fixed in: 1.22.12

Fix go get stdlib@v1.22.12

References

https://go.dev/cl/643735 [FIX]
https://go.dev/issue/71383 [REPORT]
https://groups.google.com/g/golang-announce/c/xU1ZCHUZw3k [WEB]