EUVD-2026-21183
GHSA-mx4j-fjqx-f8qj
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/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.
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/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
Lifecycle Timeline
4DescriptionCVE.org
Heap buffer overflow in CertFromX509 via AuthorityKeyIdentifier size confusion. A heap buffer overflow occurs when converting an X.509 certificate internally due to incorrect size handling of the AuthorityKeyIdentifier extension.
AnalysisAI
Heap buffer overflow in wolfSSL's CertFromX509 function allows remote attackers to cause information disclosure through malformed X.509 certificates containing oversized AuthorityKeyIdentifier extensions. The vulnerability requires a persistent attacker (AT:P per CVSS 4.0) but no authentication, affecting wolfSSL across all versions until patched. EPSS exploitation probability and active exploitation status cannot be determined from available data; no public exploit code has been independently confirmed.
Technical ContextAI
The vulnerability exists in wolfSSL's X.509 certificate parsing logic, specifically in the CertFromX509 function responsible for converting X.509 certificate structures. The AuthorityKeyIdentifier extension, a standard X.509 component used to identify the authority's signing key, is processed with a size-calculation error that causes a heap buffer overflow when the extension data exceeds expected boundaries. This is classified as CWE-122 (Heap-based Buffer Overflow), a memory safety issue where write operations exceed allocated heap memory. The flaw is triggered during certificate conversion operations, likely when wolfSSL applications validate or process digitally signed certificates.
RemediationAI
Upgrade wolfSSL to the version containing the fix from PR #10112; consult the wolfSSL release notes and GitHub repository (https://github.com/wolfSSL/wolfssl/pull/10112) to confirm the exact patched version number. As an interim mitigation, applications should restrict certificate validation to sources under administrative control and avoid processing untrusted or attacker-supplied X.509 certificates until patching is complete. Additionally, monitor wolfSSL's official security advisories and release announcements for formal patch release confirmation, as the PR reference does not independently confirm a tagged version release.
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
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