CVE-2026-39820

Description

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

CVSS breakdown

Affected products

• Golang / Go1.25.10
• Go standard library / net/mail0 – 1.25.10
• Go standard library / net/mail1.26.0-0 – 1.26.3

References

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