CVE-2026-31908

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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.12.0,3.15.0]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Apache APISIX", "source": "cna", "vendor": "Apache Software Foundation"}, "product": "apisix", "vendor": "apache"}], "analysis": {"en": {"generated_at": "2026-04-17T08:27:39.270925+00:00", "value": {"mitigation_remediation": ["Upgrade Apache APISIX to version 3.16.0 or later", "Verify that the forward\u2011auth plugin is configured to reject untrusted or malformed header values", "Monitor gateway logs for anomalous header injection patterns"], "summary": {"action": "Patch Immediately", "impact": "HTTP Header Injection"}, "threat_synthesis": {"affected_systems": "Affected versions of Apache APISIX range from 2.12.0 through 3.15.0. The vulnerability is present in the forward\u2011auth plugin bundled with these releases, so any deployment utilizing that plugin for authentication forwarding is at risk.", "description_and_impact": "The forward\u2011auth plugin of Apache APISIX contains a header injection flaw. By altering the plugin\u2019s configuration, an attacker can insert arbitrary HTTP headers into requests forwarded to downstream services. This can allow alteration of request handling, bypass of authentication controls, or modification of responses, thereby potentially compromising the integrity and confidentiality of exchanges.", "risk_and_exploitability": "This CVE has a CVSS score of 9.1 and an EPSS score of less than 1%. It is not listed in the KEV catalog, so no publicly known exploits have been documented. The likely attack vector is remote via HTTP traffic to the gateway, as the flaw is triggered by requests that reach the forward\u2011auth plugin. Given the high severity score, the risk is considered high until an update is applied."}}}}, "created": "2026-04-14T16:15:49.153316+00:00", "updated": "2026-04-17T08:30:13.702645+00:00", "vendors": ["apache", "apache$PRODUCT$apisix"]}