Certificate forgery in wolfSSL ECDSA certificate verification
CVE-2026-5194 is a critical cryptographic validation flaw in wolfSSL affecting certificate signature verification. wolfSSL failed to enforce required hash/digest size checks and associated algorithm OID checks, allowing signature verification functions to accept digests smaller than permitted by FIPS 186-4/186-5 or smaller than appropriate for the relevant key type. The issue is described as affecting ECDSA/ECC certificate verification, particularly in configurations where EdDSA or ML-DSA is also enabled; supporting content also states the broader verification logic impacts multiple signature algorithms including DSA, ML-DSA, ED25519, and ED448. As a result, malformed or forged certificates/signatures using undersized digests may be accepted as valid, weakening certificate-based authentication and enabling certificate forgery scenarios.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Affected products & vendors
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.
Recent activity
34 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability in the wolfSSL cryptographic library that could have allowed attackers to create fake certificates and host spoofed sites for targets such as email providers or banks.
A critical certificate forgery vulnerability in the wolfSSL open-source security library that could allow attackers to forge digital identities and enable convincing fake websites.
A critical vulnerability in the wolfSSL cryptography library that could allow attackers to forge certificates and impersonate trusted services such as banks or email providers.
A critical WolfSSL vulnerability that could allow attackers to forge certificates and impersonate legitimate services, undermining trust in encrypted communications.
The version that knows your environment.
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.