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High, CVSS 7.5

idunno.Bluesky, idunno.AtProto and idunno.AtProto.OAuthCallback Denial of Service Vulnerability

GHSA-8fh9-c4jq-94h4

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (idunno.bluesky 1.7.0; idunno.atproto.oauthcallback 1.7.0; idunno.atproto 1.7.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

idunno.Bluesky, idunno.AtProto and idunno.AtProto.OAuthCallback Denial of Service Vulnerability Impact The Microsoft.Bcl.Memory package, a transitive dependency of idunno.AtProto and idunno.AtProto.OAuthCallback had a Denial of Service security vulnerability, CVE-2026-26127 Patches v1.7.0 updates the dependencies on Duende.IdentityModel.OidcClient and Duende.IdentityModel.OidcClient.Extensions which, in turn, updates their dependency on Microsoft.Bcl.Memory to 10.0.4, resolving the vulnerability. Workarounds No workarounds exist for this vulnerability. How to fix the issue To update your dependencies on idunno.Bluesky, idunno.AtProto and idunno.AtProto.OAuthCallback, Using the .NET CLI (Command Line Interface): Open a terminal or command prompt in your project's directory. To update a specific package to its latest version, use the following add package command: If you are using idunno.Bluesky dotnet package update idunno.Bluesky If you are using idunno.AtProto as a direct dependency…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-8fh9-c4jq-94h4

Agent brief

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# Patch Next advisory brief: GHSA-8fh9-c4jq-94h4

Advisory: idunno.Bluesky, idunno.AtProto and idunno.AtProto.OAuthCallback Denial of Service Vulnerability
IDs: GHSA-8fh9-c4jq-94h4
Record: https://patchnext.com/advisories/ghsa-8fh9-c4jq-94h4 (revision 1, source checked 26 Oct 2026, 17:04 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: idunno.bluesky 1.7.0; idunno.atproto.oauthcallback 1.7.0; idunno.atproto 1.7.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- NuGet idunno.bluesky: affected < 1.7.0; fixed in 1.7.0
- NuGet idunno.atproto.oauthcallback: affected < 1.7.0; fixed in 1.7.0
- NuGet idunno.atproto: affected < 1.7.0; fixed in 1.7.0

## Suggested inspection (read-only)
- NuGet idunno.bluesky: check the installed version with your package manager.
- NuGet idunno.atproto.oauthcallback: check the installed version with your package manager.
- NuGet idunno.atproto: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on idunno.bluesky, idunno.atproto.oauthcallback, idunno.atproto.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-8fh9-c4jq-94h4 (GitHub-reviewed advisory GHSA-8fh9-c4jq-94h4 lists affected ranges: NuGet idunno.atproto >=0 =0 =0 <1.7.0)

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