CVE-2026-11310Network attack vector

Certificate trust bypass via untrusted intermediate anchoring

Published Jun 25, 2026 · Updated Jun 25, 2026

Improper certificate validation in wolfSSL 5.8.4 through 5.9.1 allows remote attackers to have untrusted chains accepted. The OpenSSL compatibility verifier keeps caller-supplied intermediates in its certificate manager during the trusted-store check, allowing an intermediate to serve as its own trust anchor. Exploitation requires an OPENSSL_EXTRA build and an application that passes untrusted intermediates to X509_verify_cert(); native TLS and DTLS verification are unaffected.

CVSS severity8.7
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in wolfSSL 5.8.4 through 5.9.1 allows remote attackers to have untrusted chains accepted. The OpenSSL compatibility verifier keeps caller-supplied intermediates in its certificate manager during the trusted-store check, allowing an intermediate to serve as its own trust anchor. Exploitation requires an OPENSSL_EXTRA build and an application that passes untrusted intermediates to X509_verify_cert(); native TLS and DTLS verification are unaffected.

The record

CVE
CVE-2026-11310
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
wolfSSL
Product
wolfSSL
Classifications
CWE-295
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.8.4 <=5.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

wolfSSL · wolfSSLversion=5.8.4 <=5.9.1

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
8.7wolfSSL Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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