CVE-2026-1173 identifies a denial of service vulnerability in the birkir prime software, specifically affecting versions up to 0.4.0.beta.0. The vulnerability resides in an unknown function within the /graphql endpoint's GraphQL Array Based Query Batch Handler component. This component likely processes batch GraphQL queries, and the flaw allows an attacker to craft malicious requests that cause the service to become unresponsive or crash, resulting in denial of service. The attack vector is network-based, requiring no authentication or user interaction, which makes exploitation straightforward for remote attackers. The vulnerability was reported early to the birkir project, but no patch or official response has been provided yet. The CVSS 4.0 vector indicates low attack complexity, no privileges required, no user interaction, and a limited impact on availability, with no confidentiality or integrity impact. No active exploits have been observed in the wild, but the exploit details have been publicly disclosed, increasing the risk of future attacks. The lack of a patch means affected users remain vulnerable. The vulnerability affects the 0.4.0.beta.0 version, which may be used in development or early production environments. Organizations relying on this version should consider mitigation strategies to prevent service disruption.

For European organizations, this vulnerability poses a risk of service disruption if birkir prime 0.4.0.beta.0 is deployed, particularly in environments exposing the /graphql endpoint to untrusted networks. Denial of service attacks can lead to downtime, impacting business operations, customer access, and potentially causing reputational damage. While the vulnerability does not compromise data confidentiality or integrity, availability loss can affect critical services relying on this software. Organizations in sectors with high availability requirements, such as finance, healthcare, or public services, may face operational challenges. Additionally, if birkir prime is integrated into larger platforms or services, the DoS could cascade, affecting dependent systems. The absence of a vendor patch increases the urgency for organizations to implement compensating controls. Given the remote exploitability and no need for authentication, attackers could launch automated attacks at scale, potentially targeting European infrastructure if birkir prime is in use. However, the medium severity and limited scope reduce the likelihood of widespread critical impact.

Since no official patch is available, European organizations should implement specific mitigations: 1) Restrict network access to the /graphql endpoint by applying firewall rules or API gateways to limit exposure to trusted IPs or internal networks only. 2) Implement rate limiting and request throttling on the GraphQL endpoint to prevent abuse of batch query processing. 3) Monitor logs and traffic patterns for unusual or malformed GraphQL batch requests indicative of exploitation attempts. 4) Consider deploying Web Application Firewalls (WAFs) with custom rules to detect and block suspicious GraphQL payloads. 5) If feasible, upgrade to a non-affected version of birkir prime once available or replace the component with alternative software. 6) Engage with the birkir project community to track patch releases and vulnerability disclosures. 7) Conduct internal penetration testing to assess exposure and validate mitigations. These targeted actions go beyond generic advice by focusing on controlling access and detecting exploitation attempts specific to the vulnerable GraphQL batch handler.