JLSEC-2026-678 Critical 9.1

In wolfSSL prior to 5.6.6, if callback functions are enabled (via the `WOLFSSL_CALLBACKS` flag),...

JLSEC Published: Jul 14, 2026
Modified: Jul 23, 2026
Severity: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Affected Packages: wolfSSL_jll < 5.7.2+0
Upstream: CVE-2023-6936 GHSA-cwpg-8775-j56v EUVD-2023-59134

In wolfSSL prior to 5.6.6, if callback functions are enabled (via the WOLFSSL_CALLBACKS flag), then a malicious TLS client or network attacker can trigger a buffer over-read on the heap of 5 bytes (WOLFSSL_CALLBACKS is only intended for debugging).

References

https://github.com/advisories/GHSA-cwpg-8775-j56v
https://github.com/wolfSSL/wolfssl/pull/6949
https://github.com/wolfSSL/wolfssl/pull/6949/
https://nvd.nist.gov/vuln/detail/CVE-2023-6936
https://www.wolfssl.com/docs/security-vulnerabilities
https://www.wolfssl.com/docs/security-vulnerabilities/