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CVE-2026-5188 is a low-severity integer underflow vulnerability in wolfSSL's parsing of the Subject Alternative Name (SAN) extension in X.509 certificates. A malformed certificate can declare a SAN entry length larger than the enclosing ASN.1 sequence length. During parsing, the internal remaining-length counter can wrap due to the subtraction, resulting in incorrect handling of certificate data. According to the provided advisory context, the issue is limited to builds using wolfSSL's original ASN.1 parsing implementation, which is off by default.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.