CVE-2026-4159 details a 1-byte out-of-bounds heap read vulnerability in wolfSSL versions 5.8.4 and earlier, specifically within the wc_PKCS7_DecodeEnvelopedData function. This flaw, categorized as CWE-125, can be triggered by a crafted CMS EnvelopedData message containing zero-length encrypted content, though PKCS7 support is disabled by default in wolfSSL. The vulnerability carries a low CVSS v4.0 score of 1.2, indicating a local attack vector (AV:L) with low impact on availability (VA:L) and no impact on confidentiality, integrity, or safety. There is currently no evidence of active exploitation, public exploit code, or significant community discussion, and it is not present on CISA's Known Exploited Vulnerabilities catalog.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 0, < 5.9.0CPE match | cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:* | ||
< 5.9.0CPE matchmatch criteria | cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:* |
CVSS version used by this source: 4.0
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/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:Green
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