Vulnerability · Published Mar 19, 2026 · Assigned by wolfSSL
CVE-2026-3548Buffer overflow in CRL number parsing in wolfSSL
High 7.2
In plain English
A high-severity out-of-bounds write 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 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Two buffer overflow vulnerabilities existed in the wolfSSL CRL parser when parsing CRL numbers: a heap-based buffer overflow could occur when improperly storing the CRL number as a hexadecimal string, and a stack-based overflow for sufficiently sized CRL numbers. With appropriately crafted CRLs, either of these out of bound writes could be triggered. Note this only affects builds that specifically enable CRL support, and the user would need to load a CRL from an untrusted source.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.23 | wolfssl | 5.9.1-r0 | ALPINE-CVE-2026-3548 |
| Alpine:v3.24 | wolfssl | 5.9.0-r0 | ALPINE-CVE-2026-3548 |
| Debian:12 | wolfssl | no fix listed | DEBIAN-CVE-2026-3548 |
| Debian:13 | wolfssl | no fix listed | DEBIAN-CVE-2026-3548 |
| Ubuntu:22.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2026-3548 |
| Ubuntu:24.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2026-3548 |
| Ubuntu:25.10 | wolfssl | no fix listed | UBUNTU-CVE-2026-3548 |
| Ubuntu:26.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2026-3548 |
| Ubuntu:26.10 | wolfssl | no fix listed | UBUNTU-CVE-2026-3548 |
Affected products (as reported)
Weakness: CWE-787, CWE-122 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U