EUVD-2026-39571
GHSA-r98j-g9p3-fcgm
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/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
Network delivery requires attacker-controlled PKCS#12 input (AT:P maps to AC:H) and low-privilege access; impact is integrity-only with no confidentiality or availability loss.
Primary rating from Vendor (wolfSSL).
CVSS VectorVendor: wolfSSL
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/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
2DescriptionCVE.org
PKCS#12 MAC verification uses an attacker-controlled comparison length, weakening the integrity check on the MAC and allowing a mismatched MAC to be accepted. The PKCS#12 verify path compared the locally computed HMAC against the MAC parsed from the PKCS#12 structure using a length taken directly from the attacker-supplied input, without first verifying that it equals the length of the digest actually produced by the configured algorithm. A truncated or zero-length stored MAC could therefore be accepted, defeating the integrity protection of the MAC.
AnalysisAI
PKCS#12 MAC verification in wolfSSL accepts truncated or zero-length MACs because the comparison uses an attacker-controlled length field parsed from the input structure rather than the expected digest size, completely defeating HMAC integrity protection on PKCS#12 key stores. Any wolfSSL-based application that parses PKCS#12 files from untrusted sources - including certificate import endpoints, VPN provisioning services, or key management systems - can be tricked into accepting a structurally tampered PKCS#12 bundle as MAC-verified. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target application uses wolfSSL's PKCS#12 MAC verification code path and accepts PKCS#12 input from an attacker-controlled or untrusted source. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-supplied CVSS 4.0 vector (AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N, score 6.0) reflects a moderate finding with high integrity impact confined to the vulnerable system. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with the ability to supply a PKCS#12 file to a wolfSSL-based service - such as a certificate import API or VPN client provisioning endpoint - crafts a structurally valid PKCS#12 bundle with an arbitrary or modified certificate chain, sets the embedded MAC value to an all-zero or empty byte sequence, and sets the MAC length field in the structure to zero. When wolfSSL processes this file, the HMAC comparison operates over zero bytes and trivially succeeds, causing the tampered bundle to be accepted as integrity-verified and its contents trusted by the application. … |
| Remediation | Monitor https://www.wolfssl.com/docs/security-vulnerabilities/ and the wolfSSL release notes for an official patched version announcement corresponding to the fix in GitHub PR #10192 (https://github.com/wolfSSL/wolfssl/pull/10192), then upgrade to that version as soon as it is tagged. … Detailed patch versions, workarounds, and compensating controls in full report. |
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