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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.41.0,1.69.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "AWS-LC", "source": "cna", "vendor": "AWS"}, "product": "aws-lc", "vendor": "aws"}], "analysis": {"en": {"generated_at": "2026-04-17T13:28:12.259610+00:00", "value": {"mitigation_remediation": ["Upgrade AWS\u2011LC to version 1.69.0 or later.", "If an immediate upgrade is not possible, review application code to ensure that PKCS7_verify is only called with trusted data and avoid processing authenticated attribute PKCS7 objects from untrusted sources.", "Add a defensive wrapper around PKCS7_verify that performs strict validation of the PKCS7 structure and authenticated attributes before invocation, rejecting any object that does not conform."], "summary": {"action": "Patch", "impact": "Signature Forgery"}, "threat_synthesis": {"affected_systems": "The vulnerability exists in the AWS\u2011LC library from Amazon Web Services. The advisory does not specify all affected version ranges, but customers using legacy AWS\u2011LC binaries should upgrade to at least version 1.69.0, which includes the fix. No other vendors or products are listed.", "description_and_impact": "Improper signature validation in PKCS7_verify() in AWS\u2011LC allows an unauthenticated user to bypass verification when processing PKCS7 objects that contain authenticated attributes. This flaw means that forged signatures can be accepted as valid, potentially enabling an attacker to impersonate legitimate signers or perform unauthorized operations that rely on signature authenticity and integrity.", "risk_and_exploitability": "The CVSS score of 8.7 indicates a high severity vulnerability. The EPSS score is reported as less than 1\u202f%, suggesting that exploitation is considered unlikely at the time of analysis. The flaw is not listed in CISA\u2019s KEV catalog. The attack vector is not explicitly stated in the advisory; it is inferred that an attacker would need to supply a crafted PKCS7 object to a vulnerable application that uses AWS\u2011LC's PKCS7_verify function, thus the vulnerability can be exploited remotely or locally depending on how the library is accessed."}}}}, "created": "2026-03-03T08:40:54.898512+00:00", "updated": "2026-04-17T13:30:19.607768+00:00", "vendors": ["aws", "aws$PRODUCT$aws-lc"]}