CVE-2026-5188
LOW
INFO
Priority: 0.00
BB Relevance:
45/100
Published: 2026-04-10
Modified: 2026-11-11
First seen: 2026-11-11
Status: active
Attack Surface
Network
No Auth
CVSS Vector Breakdown
AV:
Network
AC:
High
PR:
None
UI:
Passive
S:
X
AT:
Present
VC:
Low
VI:
None
VA:
Low
Description
An integer underflow issue exists in wolfSSL when parsing the Subject Alternative Name (SAN) extension of X.509 certificates. A malformed certificate can specify an entry length larger than the enclosing sequence, causing the internal length counter to wrap during parsing. This results in incorrect handling of certificate data. The issue is limited to configurations using the original ASN.1 parsing implementation which is off by default.
Weakness Classification (1)
References & Advisories (1)
Issue Tracking
Patch