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GO-2026-4342

Excessive CPU consumption when building archive index in archive/zip

Quick fix

GO-2026-4342 — stdlib: upgrade to the fixed version with the command below.

go get stdlib@v1.24.12

Details

archive/zip uses a super-linear file name indexing algorithm that is invoked the first time a file in an archive is opened. This can lead to a denial of service when consuming a maliciously constructed ZIP archive.

Are you affected?

Enter the version of the package you're using.

Affected packages

Go / stdlib

Introduced in: 0 Fixed in: 1.24.12

Fix go get stdlib@v1.24.12

References

https://go.dev/cl/736713 [FIX]
https://go.dev/issue/77102 [REPORT]
https://groups.google.com/g/golang-announce/c/Vd2tYVM8eUc [WEB]