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go 1.27.1, which is what CI has been building with - #109
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The go directive said 1.26.4 while every lane of this repository's CI pinned go-version 1.27.1 -- so the version the module DECLARED and the version it was tested with had not been the same for weeks, and a consumer reading go.mod was told it could build this with a toolchain nothing here exercises. The security case is measured, on a sibling of this module where the pin was still 1.26 (go-images/jpeg2000#28). govulncheck, same code: toolchain in packages imported in modules required go1.26.4 1 10 go1.27.1 0 0 Nothing was CALLED in any case. What 1.26.4 carries is its own standard library: GO-2026-4970 in os, and GO-2026-6218, 6091, 6090, 6089, 6088, 5972, 5942, 5026 and 5856 in stdlib, fixed across 1.26.5 and 1.26.6. govulncheck on THIS module is silent under 1.27.1 -- x/sys is already v0.48.0 here, which is past GO-2026-5024. A patch-level directive, 1.27.1 rather than 1.27, because that is the style this file already used and because the advisories above are patch-level: "1.27" would admit a toolchain that has none of 1.27.1's fixes. go vet, the whole suite, exact 100% coverage and gofmt all pass under 1.27.1, which is the toolchain CI already uses -- so this changes what is declared, not what is tested.
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One line of
go.mod, and the reason is measured.What was inconsistent
The
godirective said 1.26.4 while every lane of this repository's CI pinsgo-version: "1.27.1". The version the module declared and the version itwas tested with had not been the same for weeks, and a consumer reading
go.modwas told it could build this with a toolchain nothing here exercises.The security case, measured on a sibling
go-images/jpeg2000still pinned"1.26", so it is where the difference couldbe measured.
govulncheck, same code, two toolchains:go1.26.4go1.27.1Nothing was ever called — "your code is affected by 0 vulnerabilities" in both
— so this is what the toolchain carries. Named:
govulncheckon this module is silent under 1.27.1:golang.org/x/sysisalready v0.48.0 here, which is past GO-2026-5024.
Why
1.27.1and not1.27That is the style this file already used, and the advisories above are
patch-level:
go 1.27would admit a toolchain with none of 1.27.1's fixes.Checks
go vet, the whole suite, exact 100% coverage andgofmtall pass under1.27.1 — which is the toolchain CI already uses. This changes what is
declared, not what is tested.
Independent of #103, #105, #106 and #107; touches
go.modonly.🤖 Generated with Claude Code