What’s Vulnerable › Vulnerabilities
CVE-2026-15442: Heap use-after-free on read during bidirectional (D)TLS shutdown
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-27 · updated 2026-10-02
- Weakness: CWE-416
Description
In all builds that make use of (D)TLS, including default builds, there is a series of conditional states during the TLS shutdown which could lead to a heap-use-after free. If an application ended up getting a partial wolfSSL_read() which is sometimes caused by a small user buffer passed in, then called wolfSSL_shutdown for a bidirectional close and attempted to wolfSSL_read() again while the peer continues trying to send data during the shutdown it would lead to a state where a potential heap-use-after free happened.
Affected products
- wolfSSL: from 4.4.0 through 5.9.2
References
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