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CVE-2026-39820 is an uncontrolled resource-consumption vulnerability in Go's net/mail package. Specially crafted inputs processed by ParseAddress, ParseAddressList, or ParseDate can trigger excessive CPU consumption and memory allocation, resulting in denial of service.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
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.
46 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A network-exploitable, low-complexity, unauthenticated vulnerability with high availability impact, addressed by Oracle Linux advisory ELSA-2026-630220.
A remotely reachable, low-complexity, unauthenticated vulnerability with no confidentiality or integrity impact and high availability impact, according to the supplied CVSS v3 vector. The advisory does not provide a technical description.
A denial-of-service vulnerability in Go's net/mail package triggered by crafted email inputs.
A denial-of-service vulnerability in Go's net/mail package triggered by crafted email inputs.
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.