EUVD-2026-21229
GHSA-52wm-3mqv-vmmj
Severity by source
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
Lifecycle Timeline
4DescriptionCVE.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.
Technical ContextAI
The vulnerability exists in the PKCS7_VerifySignedData() function within wolfSSL's PKCS7 parsing implementation. PKCS7 (Cryptographic Message Syntax) is a standard for encrypted and signed messages, commonly used in TLS handshakes, email security, and digital signatures. The flaw is rooted in CWE-125 (out-of-bounds read), where the indefinite-length end-of-content verification loop fails to enforce proper bounds checking when processing specially crafted PKCS7 structures. During parsing of indefinite-length encoding-a feature of ASN.1/DER encoding that allows content of unknown length-the code does not validate that the read operation remains within allocated heap memory, potentially exposing sensitive data from adjacent memory regions.
RemediationAI
Vendor-released patch: wolfSSL 5.9.1 and later versions. Users should upgrade immediately to wolfSSL 5.9.1 or higher. The fix addresses the missing bounds check in the indefinite-length end-of-content verification loop within PKCS7_VerifySignedData(). Detailed patch information is available in the upstream fix at https://github.com/wolfssl/wolfssl/pull/10039. No workarounds are available; patching is the recommended remediation path. Verify the patched version is deployed across all systems using wolfSSL for PKCS7 message processing.
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Same weakness CWE-125 – Out-of-bounds Read
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External POC / Exploit Code
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