CVE-2026-4159 PUBLISHED

wc_PKCS7_DecodeEnvelopedData 1 byte out-of-bounds read

Assigner: wolfSSL
Reserved: 13.03.2026 Published: 19.03.2026 Updated: 19.03.2026

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.

Metrics

CVSS 4.0

CVSS Vector: 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/U:Green
CVSS Score: 1.2

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Local	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	Present	Availability	Low	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	wolfSSL
Product	wolfSSL
Versions	Default: unaffected affected from 0 to 5.9.0 (excl.)

Credits

Haruto Kimura (Stella) finder

References

https://github.com/wolfSSL/wolfssl/pull/9945

Problem Types

CWE-125 Out-of-bounds read CWE