CVE-2025-64186: evervault Signature Bypass

Description

Evervault is a payment security solution. A vulnerability was identified in the `evervault-go` SDK’s attestation verification logic in versions of `evervault-go` prior to 1.3.2 that may allow incomplete documents to pass validation. This may cause the client to trust an enclave operator that does not meet expected integrity guarantees. The exploitability of this issue is limited in Evervault-hosted environments as an attacker would require the pre-requisite ability to serve requests from specific evervault domain names, following from our ACME challenge based TLS certificate acquisition pipeline. The vulnerability primarily affects applications which only check PCR8. Though the efficacy is also reduced for applications that check all PCR values, the impact is largely remediated by checking PCR 0, 1 and 2. The identified issue has been addressed in version 1.3.2 by validating attestation documents before storing in the cache, and replacing the naive equality checks with a new SatisfiedBy check. Those who useevervault-go to attest Enclaves that are hosted outside of Evervault environments and cannot upgrade have two possible workarounds available. Modify the application logic to fail verification if PCR8 is not explicitly present and non-empty and/or add custom pre-validation to reject documents that omit any required PCRs.

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CVSS v3.1 Score

8.7

HIGH

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

Weakness Type (CWE)

CWE-347 CWE-347

Affected Products

Vendor	Product	Versions
evervault	evervault	< 1.3.2

References

Advisories & Patches

https://github.com/evervault/evervault-go/commit/7c824d289bba11ec0bea46a338023f5b128bbb28 https://github.com/evervault/evervault-go/pull/48 https://github.com/evervault/evervault-go/security/advisories/GHSA-88h9-77c7-p6w4 https://github.com/evervault/evervault-go/security/advisories/GHSA-88h9-77c7-p6w4

Exploits

https://github.com/evervault/evervault-go/security/advisories/GHSA-88h9-77c7-p6w4 https://github.com/evervault/evervault-go/security/advisories/GHSA-88h9-77c7-p6w4

Frequently Asked Questions

What is CVE-2025-64186? +

Evervault is a payment security solution. A vulnerability was identified in the `evervault-go` SDK’s attestation verification logic in versions of `evervault-go` prior to 1.3.2 that may allow incomplete documents to pass validation. This may cause the client to trust an enclave operator that does not meet expected integrity guarantees. The exploitability of this issue is limited in Evervault-hosted environments as an attacker would require the pre-requisite ability to serve requests from specific evervault domain names, following from our ACME challenge based TLS certificate acquisition pipeline. The vulnerability primarily affects applications which only check PCR8. Though the efficacy is also reduced for applications that check all PCR values, the impact is largely remediated by checking PCR 0, 1 and 2. The identified issue has been addressed in version 1.3.2 by validating attestation documents before storing in the cache, and replacing the naive equality checks with a new SatisfiedBy check. Those who useevervault-go to attest Enclaves that are hosted outside of Evervault environments and cannot upgrade have two possible workarounds available. Modify the application logic to fail verification if PCR8 is not explicitly present and non-empty and/or add custom pre-validation to reject documents that omit any required PCRs. It has a CVSS v3.1 base score of 8.7 (HIGH).

How severe is CVE-2025-64186? +

CVE-2025-64186 has a CVSS v3.1 score of 8.7 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-64186? +

CVE-2025-64186 affects products from evervault, specifically: evervault. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-64186? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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