Vulnerability · Published Apr 9, 2026 · Assigned by wolfSSL
CVE-2026-5392wolfSSL heap OOB read in PKCS7 SignedData streaming
Low 2.3
In plain English
A low-severity out-of-bounds read 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 6% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)2.3Low
Exploit odds (30 days)0.2%top 94.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Heap out-of-bounds read in PKCS7 parsing. A crafted PKCS7 message can trigger an OOB read on the heap. The missing bounds check is in the indefinite-length end-of-content verification loop in PKCS7_VerifySignedData().
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.23 | wolfssl | 5.9.1-r0 | ALPINE-CVE-2026-5392 |
| Alpine:v3.24 | wolfssl | 5.9.1-r0 | ALPINE-CVE-2026-5392 |
| Debian:12 | wolfssl | no fix listed | DEBIAN-CVE-2026-5392 |
| Debian:13 | wolfssl | no fix listed | DEBIAN-CVE-2026-5392 |
| Ubuntu:22.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2026-5392 |
| Ubuntu:24.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2026-5392 |
| Ubuntu:25.10 | wolfssl | no fix listed | UBUNTU-CVE-2026-5392 |
| Ubuntu:26.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2026-5392 |
| Ubuntu:26.10 | wolfssl | no fix listed | UBUNTU-CVE-2026-5392 |
Affected products (as reported)
Weakness: CWE-125 · Vector: CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N