How severe is CVE-2026-35523?

CVE-2026-35523 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-35523 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35523?

CVE-2026-35523 affects Strawberry Strawberry Graphql. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-35523?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-35523 have an EU (EUVD) identifier?

Yes. CVE-2026-35523 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19716.

When was CVE-2026-35523 published?

CVE-2026-35523 was published on 2026-04-07 and last updated on 2026-06-17.

CVE-2026-35523

CVE-2026-35523 is a high-severity vulnerability in Strawberry Strawberry Graphql with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-306.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19716
Weakness: CWE-306
Affected product: Strawberry Strawberry Graphql
Published: 2026-04-07
Last modified: 2026-06-17

Description

Strawberry GraphQL is a library for creating GraphQL APIs. Strawberry up until version 0.312.3 is vulnerable to an authentication bypass on WebSocket subscription endpoints. The legacy graphql-ws subprotocol handler does not verify that a connection_init handshake has been completed before processing start (subscription) messages. This allows a remote attacker to skip the on_ws_connect authentication hook entirely by connecting with the graphql-ws subprotocol and sending a start message directly, without ever sending connection_init. This vulnerability is fixed in 0.312.3.

Frequently asked questions

What is CVE-2026-35523?: Strawberry GraphQL is a library for creating GraphQL APIs. Strawberry up until version 0.312.3 is vulnerable to an authentication bypass on WebSocket subscription endpoints. The legacy graphql-ws subprotocol handler does not verify that a connection_init handshake has been completed before processing start (subscription) messages. This allows a remote attacker to skip the on_ws_connect authentication hook entirely by connecting with the graphql-ws subprotocol and sending a start message directly, without ever sending connection_init. This vulnerability is fixed in 0.312.3.
How severe is CVE-2026-35523?: CVE-2026-35523 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-35523 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35523?: CVE-2026-35523 affects Strawberry Strawberry Graphql. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-35523?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-35523 have an EU (EUVD) identifier?: Yes. CVE-2026-35523 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19716.
When was CVE-2026-35523 published?: CVE-2026-35523 was published on 2026-04-07 and last updated on 2026-06-17.

References

https://github.com/strawberry-graphql/strawberry/security/advisories/GHSA-vpwc-v33q-mq89

Affected products (1)

cpe:2.3:a:strawberry:strawberry_graphql:*:*:*:*:*:python:*:*

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