Vulnerability · Published Sep 27, 2026 · Assigned by wolfSSL
CVE-2026-15442Heap use-after-free on read during bidirectional (D)TLS shutdown
Low 2.3
In plain English
A low-severity use-after-free in wolfSSL from wolfSSL. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | wolfssl | 5.9.4-r0 | ALPINE-CVE-2026-15442 |
| Debian:12 | wolfssl | no fix listed | DEBIAN-CVE-2026-15442 |
| Debian:13 | wolfssl | no fix listed | DEBIAN-CVE-2026-15442 |
| Ubuntu:22.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2026-15442 |
| Ubuntu:24.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2026-15442 |
| Ubuntu:26.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2026-15442 |
| Ubuntu:26.10 | wolfssl | no fix listed | UBUNTU-CVE-2026-15442 |
Affected products (as reported)
Weakness: CWE-416 · Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N