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Description

wolfSSL's wc_PKCS7_DecodeAuthEnvelopedData() does not properly sanitize the AES-GCM authentication tag length received and has no lower bounds check. A man-in-the-middle can therefore truncate the mac field from 16 bytes to 1 byte, reducing the tag check from 2⁻¹²⁸ to 2⁻⁸.

PUBLISHED Reserved 2026-04-03 | Published 2026-04-10 | Updated 2026-04-10 | Assigner wolfSSL




HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Problem types

CWE-20 Improper input validation

Product status

Default status
unaffected

Any version
affected

Credits

Calif.io in collaboration with Claude and Anthropic Research finder

References

github.com/wolfSSL/wolfssl/pull/10102

cve.org (CVE-2026-5500)

nvd.nist.gov (CVE-2026-5500)

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