All vulnerabilities
CVE-2026-15442

wolfSSL: Heap use-after-free on read during bidirectional (D)TLS shutdown

wolfSSL wolfSSL
Open in ThreatlineRecord JSON
CVSS
2.3Low
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.30%Chance of exploitation activity in the next 30 days, higher than 21% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version yet
Published27 Sep 2026Updated 30 Sep 2026CVE List

What fixes it

No source in this snapshot names a fixed version.

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.

Text from CVE List

Affected versions 1

  • wolfSSLaffected: 4.4.0 through 5.9.2CVE List

References 1