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wolfSSL: Session Data Overflow Vulnerability

published 3 months ago

Summary

An attacker can cause wolfSSL to crash or behave unexpectedly by loading a malicious session from an external source. This can happen when wolfSSL is used to verify or establish secure connections. To protect against this vulnerability, update wolfSSL to the latest version.

What to do

Update juliabinarywrappers wolfssl_jll to version 5.9.2+0.

Affected software

Ecosystem	Vendor	Product	Affected versions
Julia	juliabinarywrappers	wolfssl_jll	< 5.9.2+0 Fix: upgrade to 5.9.2+0

Original advisory text

A heap-buffer-overflow vulnerability exists in wolfSSL's `wolfSSL_d2i_SSL_SESSION()` function

A heap-buffer-overflow vulnerability exists in wolfSSL's `wolfSSL_d2i_SSL_SESSION()` function. When deserializing session data with `SESSION_CERTS` enabled, certificate and session id lengths are read from an untrusted input without bounds validation, allowing an attacker to overflow fixed-size buffers and corrupt heap memory. A maliciously crafted session would need to be loaded from an external source to trigger this vulnerability. Internal sessions were not vulnerable.

References

Fix within

Internet-facing 60 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit (estimated)
Gives an attacker partial control (estimated)

Severity

7.4 High

Timeline

Published14 Jul 2026

Updated28 Jul 2026

First seen14 Jul 2026

Sources

JLSEC-2026-702 · OSV

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