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High severity8.1NVD Advisory· Published Apr 10, 2026· Updated Apr 29, 2026

CVE-2026-5188

CVE-2026-5188

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.

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Affected products

2
  • WolfSSL/Wolfssl2 versions
    cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*range: <5.9.1
    • (no CPE)

Patches

Vulnerability mechanics

References

1

News mentions

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