Go crypto/x509 certificate chain building denial of service
CVE-2026-32280 is a denial-of-service vulnerability in Go's certificate chain building logic in crypto/x509. During chain building, the implementation does not correctly limit the amount of work performed when a large number of intermediate certificates are supplied via VerifyOptions.Intermediates. As a result, processing attacker-controlled or otherwise excessive intermediate certificate sets can trigger unexpectedly expensive path-building work. The issue affects direct consumers of crypto/x509 as well as applications using crypto/tls, because TLS certificate validation relies on the same chain-building behavior.
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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
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Remediation
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Exploits
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No public exploit code observed for this vulnerability.
Affected products & vendors
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
28 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.
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.