CVE-2025-64186

A vulnerability was identified in the evervault-go SDK’s attestation verification logic 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.

Workarounds

If you are using evervault-go to attest Enclaves that are hosted outside of Evervault environments and cannot upgrade:

1. Modify your application logic to fail verification if PCR8 is not explicitly present and non-empty
2. Add custom pre-validation to reject documents that omit any required PCRs.

POC

package evervault
import (
        "testing"

        "github.com/evervault/evervault-go/attestation"
        "github.com/stretchr/testify/assert"
        "github.com/hf/nitrite"
)


func TestVulnerableCompare(t *testing.T) {
          assert := assert.New(t)
          // arrange
          expectedPCRs := []attestation.PCRs{
                attestation.PCRs{
                      PCR0:
"000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001",
                      PCR1:
"000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002",
                      PCR2:
"000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003",
                      PCR8:
"000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004",
                     },
           }
            actualDocument := nitrite.Document {}
            actualDocument.PCRs = map[uint][]byte{
                    10: make([]byte, 32),
            }
            // act
            v := verifyPCRs(expectedPCRs, actualDocument)
            
            // assert
            // Verify should not pass but it does
            
            assert.Equal(true, v)
}

CVE-2025-64186 has a CVSS score of 8.7 (High). The vector is network-reachable, high privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (1.3.2); upgrading removes the vulnerable code path.

Kodem intelligence

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.

1. What is CVE-2025-64186? CVE-2025-64186 is a high-severity security vulnerability in github.com/evervault/evervault-go (go), affecting versions < 1.3.2. It is fixed in 1.3.2.
2. How severe is CVE-2025-64186? CVE-2025-64186 has a CVSS score of 8.7 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of github.com/evervault/evervault-go are affected by CVE-2025-64186? github.com/evervault/evervault-go (go) versions < 1.3.2 is affected.
4. Is there a fix for CVE-2025-64186? Yes. CVE-2025-64186 is fixed in 1.3.2. Upgrade to this version or later.
5. Is CVE-2025-64186 exploitable, and should I be worried? Whether CVE-2025-64186 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2025-64186 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2025-64186? Upgrade github.com/evervault/evervault-go to 1.3.2 or later.