CVE-2026-23897

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{}

{"analysis": {"en": {"generated_at": "2026-04-17T23:20:12.679096+00:00", "value": {"mitigation_remediation": ["Upgrade Apollo Server to a version outside the affected ranges\u20143.13.1 or later, 4.13.0 or later, or 5.4.0 or later, where the vulnerability has been patched.", "If an upgrade is not feasible, avoid using startStandaloneServer; instead, integrate Apollo Server via the available framework adapters (for example, @as\u2011integrations/express5 or @as\u2011integrations/next).", "Implement request\u2011payload validation or filtering in your application layer to reject exotic character\u2011encoding payloads when the startStandaloneServer API must remain in use."], "summary": {"action": "Patch or Upgrade", "impact": "Denial of Service (DoS) via specially crafted request bodies"}, "threat_synthesis": {"affected_systems": "The vulnerability affects Apollo Server packages from multiple major releases: versions 2.0.0 through 3.13.0, 4.2.0 through 4.12.x, and 5.0.0 through 5.3.x. Direct usage of startStandaloneServer in these ranges is impacted; integration of Apollo Server via wrappers such as @as\u2011integrations/express5 or @as\u2011integrations/next is not affected.", "description_and_impact": "Apollo Server, a popular GraphQL server, suffers from a denial\u2011of\u2011service vulnerability when the default startStandaloneServer configuration is used. Attackers can craft request bodies employing exotic character\u2011set encodings to exhaust server resources. The weakness is identified as CWE\u20111333, reflecting unvalidated, bizarre input that triggers abnormal processing.", "risk_and_exploitability": "The CVSS score of 7.5 indicates a high severity with moderate complexity for exploit. The EPSS score of less than 1% suggests that the likelihood of publicly available exploitation is currently low, and the vulnerability is not listed in CISA\u2019s KEV catalog. Nonetheless, an attacker who can send crafted request bodies to a publicly exposed GraphQL endpoint running an affected version can cause resource exhaustion, leading to service downtime. The attack vector is inferred to be remote and network\u2011based, requiring no local privileges."}}}}, "created": "2026-02-05T11:39:14.802301+00:00", "updated": "2026-04-17T23:30:15.909343+00:00", "vendors": ["apollographql", "apollographql$PRODUCT$apollo_explorer"]}