Is there a patch available for EUVD-2026-21229?

Yes, a patch is available for EUVD-2026-21229. Update the affected software to the latest version immediately.

Wolfssl EUVD-2026-21229

Q: What is the CVSS score of EUVD-2026-21229?

EUVD-2026-21229 has a CVSS 4.0 base score of 2.3 (Low). CVSS vector: CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

| CVE-2026-5392 LOW

Out-of-bounds Read (CWE-125)

2026-04-09 wolfSSL

GHSA-52wm-3mqv-vmmj

Information Disclosure Buffer Overflow Wolfssl

2.3

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

2.3 LOW

CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Lifecycle Timeline

Patch available

Apr 16, 2026 - 05:29 EUVD

5.9.1

EUVD ID Assigned

Apr 09, 2026 - 23:31 euvd

EUVD-2026-21229

Analysis Generated

Apr 09, 2026 - 23:31 vuln.today

CVE Published

Apr 09, 2026 - 23:10 nvd

LOW 2.3

DescriptionCVE.org

Heap out-of-bounds read in PKCS7 parsing. A crafted PKCS7 message can trigger an OOB read on the heap. The missing bounds check is in the indefinite-length end-of-content verification loop in PKCS7_VerifySignedData().

AnalysisAI

Heap out-of-bounds read in wolfSSL versions prior to 5.9.1 allows unauthenticated attackers on an adjacent network to trigger information disclosure via a crafted PKCS7 message that bypasses bounds checking in the indefinite-length end-of-content verification loop. The vulnerability has a low CVSS score of 2.3 due to restricted attack vector (adjacent network only) and limited integrity impact, with no public exploit code identified at time of analysis.

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Vulnerability AssessmentAI

Risk Assessment	This vulnerability presents a low real-world risk despite being a memory safety issue. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker on the same adjacent network segment crafts a malicious PKCS7 message with an indefinite-length encoding that triggers the bounds-checking bypass in PKCS7_VerifySignedData(). When the target system processes this message (e.g., during TLS handshake or message validation), the out-of-bounds read exposes heap memory contents that may contain sensitive cryptographic material or application secrets. …
Remediation	Vendor-released patch: wolfSSL 5.9.1 and later versions. … Detailed patch versions, workarounds, and compensating controls in full report.

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EUVD-2026-21229 vulnerability details – vuln.today

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