CVE-2026-1173 identifies a denial of service vulnerability in birkir prime, an open-source or commercial software product used for GraphQL API handling, specifically versions up to 0.4.0.beta.0. The vulnerability resides in the GraphQL Array Based Query Batch Handler component, within an unspecified function related to the /graphql endpoint. This flaw allows an unauthenticated remote attacker to send specially crafted requests that manipulate the batch query processing, leading to resource exhaustion or application crash, thereby causing denial of service. The vulnerability does not require any privileges or user interaction, making it easily exploitable over the network. The vendor was notified early via an issue report but has not issued a fix or official response, leaving systems exposed. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P) indicates network attack vector, low complexity, no authentication, no user interaction, no impact on confidentiality or integrity, but low impact on availability (likely partial service disruption). No known exploits are currently active in the wild, but public exploit code exists, increasing the risk of exploitation. The vulnerability affects the core GraphQL API endpoint, which is critical for applications relying on birkir prime for data querying and aggregation, potentially causing significant service interruptions.

For European organizations utilizing birkir prime, especially those relying on GraphQL APIs for critical business functions, this vulnerability poses a risk of service disruption through denial of service attacks. Such outages could affect customer-facing applications, internal data services, or integrated platforms, leading to operational downtime, loss of productivity, and reputational damage. Industries with high dependency on real-time data queries, such as financial services, e-commerce, and telecommunications, may experience amplified impacts. Additionally, the lack of vendor response and patch availability prolongs exposure, increasing the window for potential exploitation. While the vulnerability does not compromise data confidentiality or integrity, availability impacts can cascade into broader business continuity challenges. European regulatory frameworks like GDPR emphasize service availability and data protection, so prolonged outages could also have compliance implications.

Until an official patch is released by the birkir project, European organizations should implement specific mitigations to reduce risk. These include deploying Web Application Firewalls (WAFs) with custom rules to detect and block suspicious GraphQL batch query patterns targeting the /graphql endpoint. Rate limiting and throttling of incoming GraphQL requests can help prevent resource exhaustion. Network segmentation should isolate critical GraphQL services from untrusted networks. Monitoring and alerting on unusual spikes in GraphQL request volumes or error rates can provide early warning of exploitation attempts. Organizations should also consider temporary disabling or restricting access to the batch query feature if feasible. Engaging with the birkir community or project maintainers to track patch developments is important. Finally, conducting internal penetration testing focused on GraphQL endpoints can help identify exposure and validate mitigations.