EUVD-2026-66957
GHSA-7p87-32cx-94g2
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable unauthenticated DoS with no confidentiality or integrity impact; single request triggers worst-case CPU exhaustion confined to the vulnerable worker process.
Primary rating from Vendor (CNA).
CVSS VectorVendor
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
5Description PRE-NVD
Articles & Coverage 2
AnalysisAI
CPU exhaustion via algorithmic complexity in Apache APISIX 3.17.0 allows unauthenticated remote attackers to pin a gateway worker process at 100% CPU using a single small HTTP request targeting routes protected by the graphql-limit-count plugin. The CVSS 4.0 score of 8.7 reflects the high availability impact and trivial exploitation requirements - no authentication, no complexity, no user interaction. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the graphql-limit-count plugin to be enabled and applied to at least one route on the Apache APISIX 3.17.0 instance - instances not using this plugin on any route are not exposed regardless of network accessibility. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N) is internally consistent with the described vulnerability: network-reachable, unauthenticated, zero-complexity exploitation yielding high availability impact with no confidentiality or integrity consequence and no downstream system impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker probes an Apache APISIX 3.17.0 deployment and identifies a route with the graphql-limit-count plugin enabled. The attacker submits a single small, specially structured HTTP request to that route, triggering worst-case algorithmic processing in the plugin and pinning the target worker process at 100% CPU for an extended period. … |
| Remediation | Upgrade Apache APISIX to version 3.18.0, which is confirmed by the vendor to resolve this issue; the fix is documented in the Apache OSS Security advisory at https://seclists.org/oss-sec/2026/q3/591 and the Apache APISIX project site at https://apisix.apache.org. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all systems running Apache APISIX 3.17.0 and determine which have the graphql-limit-count plugin enabled in production routes. …
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Same weakness CWE-407 – Inefficient Algorithmic Complexity
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External POC / Exploit Code
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