{"record":{"id":"9f3d5088516c120d","repo":"kubernetes/kops","slug":"unexpected-signed-headers-value","errorCode":null,"errorMessage":"unexpected signed headers value","messagePattern":"unexpected signed headers value","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"pkg/bootstrap/awsbootstrap/verifier.go","lineNumber":195,"sourceCode":"\n\tfor _, token := range strings.Split(strings.TrimPrefix(authorization, \"AWS4-HMAC-SHA256 \"), \", \") {\n\t\tkv := strings.SplitN(token, \"=\", 2)\n\t\tif len(kv) == 1 {\n\t\t\treturn nil, fmt.Errorf(\"incorrect authorization format\")\n\t\t}\n\t\tgot := kv[1]\n\t\tswitch kv[0] {\n\t\tcase \"Signature\":\n\t\t\tamzSignature = got\n\t\tcase \"Credential\":\n\t\t\tamzCredential = got\n\t\tcase \"SignedHeaders\":\n\t\t\tamzSignedHeaders = got\n\t\t}\n\t}\n\tsignedHeaders := sets.New(strings.Split(amzSignedHeaders, \";\")...)\n\tif !signedHeaders.Has(\"x-kops-request-sha\") {\n\t\treturn nil, fmt.Errorf(\"unexpected signed headers value\")\n\t}\n\n\tif amzSignature == \"\" {\n\t\treturn nil, fmt.Errorf(\"unexpected signature value\")\n\t}\n\tif amzCredential == \"\" {\n\t\treturn nil, fmt.Errorf(\"unexpected credential value\")\n\t}\n\n\tcallerIdentity, err := a.stsRequestValidator.getCallerIdentityV1(ctx, &a.client, decoded)\n\tif err != nil {\n\t\treturn nil, err\n\t}\n\n\treturn verifyCallerIdentity(ctx, callerIdentity)\n}\n\nfunc (a awsVerifier) verifyTokenV2(ctx context.Context, token string, body []byte, verifyCallerIdentity verifyCallerIdentityFunc) (*bootstrap.VerifyResult, error) {","sourceCodeStart":177,"sourceCodeEnd":213,"githubUrl":"https://github.com/kubernetes/kops/blob/4c8573c808a73d578c5eadc86d410646ea0b0d73/pkg/bootstrap/awsbootstrap/verifier.go#L177-L213","documentation":"Verification guard in verifyTokenV1: the SignedHeaders list of the presigned request does not include x-kops-request-sha, so the request body hash is not covered by the signature and the token is rejected.","triggerScenarios":"Thrown at pkg/bootstrap/awsbootstrap/verifier.go:195 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Sign x-kops-request-sha when generating the token","Use kOps' own token generation code","Update mismatched kOps client versions"],"exampleFix":null,"handlingStrategy":"validation","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"4c8573c808a73d578c5eadc86d410646ea0b0d73","analyzedAt":"2026-09-05T04:13:19.212Z","contentChangedAt":"2026-09-05T04:13:19.212Z","schemaVersion":2},"datasetVersion":"2026-09-12T12:17:11.808Z"}