System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected fails in CI

[jakobbotsch]

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1608726
Build error leg or test failing: System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected
Pull request: #134075

Error Message

DO NOT USE JSON BELOW IF THIS IS A BUILD BREAK otherwise build analysis will allow pull requests to merge that break the build worse. For a build break, do not use this issue form. Make a regular new issue.

Fill the error message using step by step known issues guidance.

{
  "ErrorMessage": "System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected(kem: DHKEM_X25519_HKDF_SHA256, prefix: 0) [FAIL]",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

cc @vcsjones

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1608726
Error message validated: [System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected(kem: DHKEM_X25519_HKDF_SHA256, prefix: 0) [FAIL]]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 9/23/2026 3:17:55 PM UTC

Report

Build	Repository	Test	Pull Request
1611974	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected
1611548	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected
1611410	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134560
1611331	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected
1610995	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134596
1610988	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134595
1611133	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134284
1611079	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#133533
1611095	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected
1611054	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#133188
1611001	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134497
1611048	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#132425
1610991	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134355
1610967	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134566
1610834	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134508
1610827	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134498
1610794	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134560
1610760	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#133776
1610747	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134048
1609481	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134360
1610702	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134590
1610699	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134426
1610560	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#131265
1610552	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134584
1610504	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134505
1610456	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#130463
1610405	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134502
1610318	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134497
1610317	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected
1610268	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected
1610287	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134568
1609637	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134394
1610180	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134566
1610090	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134393
1610145	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#133222
1610100	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#133384
1610103	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134541
1610002	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#132425
1609970	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#133188
1609957	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#133263
1609928	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected
1609942	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134497
1609930	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134078
1609918	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#133776
1609903	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134284
1609856	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#133658
1609859	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#133660
1609857	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#133659
1609841	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134111
1609811	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134456
1609714	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#133662
1609665	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134464
1609647	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#133265
1609616	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134553
1609627	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected
1609545	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134548
1609185	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134460
1609559	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134490
1609508	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134541
1609497	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134210
1609511	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#132534
1609471	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134533
1609458	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#133986
1609375	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134312
1609313	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected
1609253	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134355
1609243	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134529
1609227	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#130463
1609193	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134497
1609152	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134506
1609085	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134522
1609138	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134526
1609048	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134521
1609033	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134518
1609039	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134520
1608991	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134517
1608987	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134516
1608985	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134514
1608839	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134509
1608825	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134502
1608804	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134508
1608726	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134075
1608697	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134505
1607863	dotnet/runtime	System.Security.Cryptography.Tests.HpkeImplementationTests.InvalidEncapsulation_Rejected	#134464

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
7	84	84

[dotnet-policy-service]

Tagging subscribers to this area: @bartonjs, @vcsjones, @dotnet/area-system-security
See info in area-owners.md if you want to be subscribed.

[vcsjones]

Ye olde' "Windows 10 CI run that doesn't happen for libraries runs"

I'll have a fix up shortly.

[vcsjones]

Fix is merged; leaving this open until back ports are done.