CVE-2026-39820

HIGHNVD 7.57.5—

7.5

Well-crafted inputs reaching ParseAddress, ParseAddressList, and ParseDate were able to trigger excessive CPU exhaustion and memory allocations.

CVSS v3: 7.5
EG Score: 7.5(high)
EPSS: 16.9%
KEV: Not listed

Published

May 7, 2026

Last Modified

May 13, 2026

References (4)

security@golanghttps://go.dev/cl/759940
security@golanghttps://go.dev/issue/78566
security@golanghttps://groups.google.com/g/golang-announce/c/qcCIEXso47M
security@golanghttps://pkg.go.dev/vuln/GO-2026-4986

Vendor Advisories for CVE-2026-39820(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

CVE-2026-39820
Microsoft Security Response Center (MSRC)
Quadratic string concatentation in consumeComment in net/mail

Frequently asked(5)

What is CVE-2026-39820?

CVE-2026-39820 is a high vulnerability published on May 7, 2026. Well-crafted inputs reaching ParseAddress, ParseAddressList, and ParseDate were able to trigger excessive CPU exhaustion and memory allocations.

When was CVE-2026-39820 disclosed?

CVE-2026-39820 was first published in the National Vulnerability Database on May 7, 2026, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-39820 actively exploited?

CVE-2026-39820 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 16.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-39820?

CVE-2026-39820 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2026-39820?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-39820, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2026-39820

📅 Published

🔄 Last Modified

🔗 References (4)

📣 Vendor Advisories for CVE-2026-39820(1)

❓ Frequently asked(5)