CVE-2026-4159
low
CVSS v3
3.3
CVSS v2
—
VIR risk
3.3
Description
1-byte OOB heap read in wc_PKCS7_DecodeEnvelopedData via zero-length encrypted content. A vulnerability existed in wolfSSL 5.8.4 and earlier, where a 1-byte out-of-bounds heap read in wc_PKCS7_DecodeEnvelopedData could be triggered by a crafted CMS EnvelopedData message with zero-length encrypted content. Note that PKCS7 support is disabled by default.
Predictions
Exploit likelihood
34%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2026-4159
Vendor advisory: facts@wolfssl.com — https://github.com/wolfSSL/wolfssl/pull/9945
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | affected | |
| debian | bullseye | affected | |
| debian | forky | fixed | 5.9.0-0.1 |
| debian | sid | fixed | 5.9.0-0.1 |
| debian | trixie | affected | |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| wolfssl | wolfssl | {"endExcluding":"5.9.0"} | 5.9.0 |
References
CWEs
CWE-125
Verify integrity in audit chain (admin only). AS-IS.