dgraph-io dgraph up to 25.3.2 JSON /alter x.PredicateLang pred.Lang data query logic injection

Summaryinfo

A vulnerability labeled as critical has been found in dgraph-io dgraph up to 25.3.2. Affected by this vulnerability is the function x.PredicateLang of the file /alter of the component JSON Handler. The manipulation of the argument pred.Lang results in data query logic injection. This vulnerability is reported as CVE-2026-41328. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in dgraph-io dgraph up to 25.3.2. It has been classified as critical. Affected is the function x.PredicateLang of the file /alter of the component JSON Handler. The manipulation of the argument pred.Lang with an unknown input leads to a data query logic injection vulnerability. CWE is classifying the issue as CWE-943. The product generates a query intended to access or manipulate data in a data store such as a database, but it does not neutralize or incorrectly neutralizes special elements that can modify the intended logic of the query. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Dgraph is an open source distributed GraphQL database. Prior to 25.3.3, a vulnerability has been found in Dgraph that gives an unauthenticated attacker full read access to every piece of data in the database. This affects Dgraph's default configuration where ACL is not enabled. The attack requires two HTTP POSTs to port 8080. The first sets up a schema predicate with @unique @index(exact) @lang via /alter (also unauthenticated in default config). The second sends a crafted JSON mutation to /mutate?commitNow=true where a JSON key contains the predicate name followed by @ and a DQL injection payload in the language tag position. The injection exploits the addQueryIfUnique function in edgraph/server.go, which constructs DQL queries using fmt.Sprintf with unsanitized predicateName that includes the raw pred.Lang value. The Lang field is extracted from JSON mutation keys by x.PredicateLang(), which splits on @, and is never validated by any function in the codebase. The attacker injects a closing parenthesis to escape the eq() function, adds an arbitrary named query block, and uses a # comment to neutralize trailing template syntax. The injected query executes server-side and its results are returned in the HTTP response. This vulnerability is fixed in 25.3.3.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-41328 since 04/20/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit.

Upgrading to version 25.3.3 eliminates this vulnerability.

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Productinfo

Vendor

• dgraph-io

Name

• dgraph

Version

• 25.3.0
• 25.3.1
• 25.3.2

Website

• Product: https://github.com/dgraph-io/dgraph/

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