Dgraph: Zero Unauthenticated HTTP Admin removeNode Denial of Service

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

9.2 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:H · score source

EPSS

• CVE-2026-102748: 0.61% estimated exploitation activity in the next 30 days; percentile 49.51 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary Dgraph v25.3.8 exposes a Zero HTTP administrative surface that is unauthenticated when port 6080 is reachable. The exposed routes include: - /state - /assign - /removeNode - /moveTablet An unauthenticated request to /removeNode?id=1&group=0 on a single-node standalone deployment breaks the Zero control plane and leaves Alpha repeatedly failing to reconnect to localhost:5080. Details The issue exists because Zero administrative HTTP endpoints are registered directly without any authentication or IP-whitelist wrapper. Relevant code paths: - worker/serverstate.go:41 - dgraph/cmd/zero/run.go:295-301 - dgraph/cmd/zero/http.go:106-129 - dgraph/cmd/zero/zero.go:475-477 The relevant behavior is: - disable-admin-http=false by default - /removeNode accepts attacker-controlled id and group - removeNode forwards those directly into Server.RemoveNode - for group=0, Server.RemoveNode immediately calls ProposePeerRemoval This means a remote unauthenticated caller can directly trigger…

Published by the source

15 Oct 2026, 20:17 UTC

Last modified by the source

15 Oct 2026, 20:30 UTC

Source last checked

26 Oct 2026, 15:32 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-qj98-gp63-54xj

2. Revision 2 · amended · 25 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-qj98-gp63-54xj

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# Patch Next advisory brief: CVE-2026-102748

Advisory: Dgraph: Zero Unauthenticated HTTP Admin removeNode Denial of Service
IDs: CVE-2026-102748, GHSA-qj98-gp63-54xj
Record: https://patchnext.com/advisories/cve-2026-102748 (revision 3, source checked 26 Oct 2026, 15:32 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/dgraph-io/dgraph/v25 25.4.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/dgraph-io/dgraph/v25: affected <= 25.3.8; fixed in 25.4.0

## Suggested inspection (read-only)
- Go github.com/dgraph-io/dgraph/v25: 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 github.com/dgraph-io/dgraph/v25.
- 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://osv.dev/vulnerability/GHSA-qj98-gp63-54xj (OSV record GHSA-qj98-gp63-54xj lists affected ranges: Go github.com/dgraph-io/dgraph/v25 >=0 <25.4.0 (fixed))
- Verified: https://github.com/advisories/GHSA-qj98-gp63-54xj (GitHub-reviewed advisory GHSA-qj98-gp63-54xj lists affected ranges: Go github.com/dgraph-io/dgraph/v25 >=0 <=25.3.8)

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