What’s Vulnerable › Vulnerabilities

CVE-2025-61725: Excessive CPU consumption in ParseAddress in net/mail

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-29 · updated 2026-10-08

Description

The ParseAddress function constructs domain-literal address components through repeated string concatenation. When parsing large domain-literal components, this can cause excessive CPU consumption.

Affected products

• Go standard library net/mail: before 1.24.8; from 1.25.0 before 1.25.2 — fixed in 1.24.8, 1.25.2

How to fix

Upgrade to a fixed version: Go standard library net/mail 1.24.8, 1.25.2. Check the vendor advisory for mitigations.

References

• https://go.dev/cl/709860
• https://go.dev/issue/75680
• https://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI
• https://pkg.go.dev/vuln/GO-2025-4006
• http://www.openwall.com/lists/oss-security/2025/10/08/1

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