CVE-2026-45739 Strawberry GraphQL: Default GraphiQL may expose HTTP headers in URLs

What is CVE-2026-45739?

CVE-2026-45739 is a low-severity vulnerability in strawberry-graphql strawberry, published on 4 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Strawberry GraphQL is a library for creating GraphQL APIs. In versions 0.288.4 through 0.315.3, Strawberry's bundled GraphiQL template wrote values from the GraphiQL headers editor into the browser URL query string. If a user entered a sensitive header, such as `Authorization: Bearer <token>`, the value could become visible in browser history, copied links, and server/proxy/CDN access logs after a page reload or shared request. Version 0.315.4 patches the issue.

Weakness: CWE-201, CWE-200

Which versions are affected by CVE-2026-45739?

3 open source packages ship an affected version, including strawberry-graphql. It affects 1 product.

Products include Strawberry Strawberry Graphql.

How do I fix CVE-2026-45739?

Upgrade strawberry-graphql to 0.315.4 or later.

Is CVE-2026-45739 being exploited?

There is no known exploitation of CVE-2026-45739 in the wild and no public exploit code.

Other vulnerabilities in strawberry-graphql strawberry

• CVE-2026-35523 Authentication bypass in strawberry-graphql via legacy graphql-ws WebSocket subprotocol High 7.5
• CVE-2026-35526 Strawberry GraphQL affected by a Denial of Service via unbounded WebSocket subscriptions High 7.5
• CVE-2026-47706 Strawberry GraphQL has a Circular Fragment Reference DOS Medium 5.3
• CVE-2026-47707 Strawberry GraphQL's Bypass of MaxAliasesLimiter via Fragment Spreads leading to GraphQL Alias Amplification Medium 5.3

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-x97m-qp5c-w9xj, PYSEC-2026-2282.