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mail

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

This vulnerability (CVE-2026-39820) in the Go standard library net/mail package involves inefficient algorithmic complexity (CWE-407) and unchecked input for loop condition (CWE-606). When applications call ParseAddress, ParseAddressList, or ParseDate with specially crafted inputs, it can trigger excessive CPU exhaustion and memory allocations, resulting in denial of service. The issue is confirmed by Red Hat and scored with a CVSS v3.1 base score of 7.5 (high severity) with no confidentiality or integrity impact but high availability impact. Red Hat advisories indicate no current patch or fix meeting their criteria is available, and mitigation options are limited. The vulnerability affects specific Go versions including 1.26.0-0 and 0 as stated.

Detailed information about CVE-2026-39820: CWE-407: Inefficient Algorithmic Complexity in Go standard library net/mail affecting Go standard library net/mail. G

CVE-2026-39820: CWE-407: Inefficient Algorithmic Complexity in Go standard library net/mail - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-39820: CWE-407: Inefficient Algorithmic Complexity in Go standard library net/mail

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

The vulnerability in the net/mail package of the Go standard library is caused by quadratic string concatenation in the consumePhrase function when parsing pathological email addresses. This inefficient algorithmic complexity can be exploited remotely by sending crafted email addresses, resulting in excessive resource consumption and denial of service in Go applications that use this library for email parsing. The issue is tracked under CWE-407 (Inefficient Algorithmic Complexity) and CWE-1046 (Creation of Immutable Text Using String Concatenation). Red Hat's advisory confirms the impact and states that no suitable mitigation or fix is currently available that meets their criteria for ease of use, deployment, and stability. The vulnerability affects specific Go versions including 1.26.0-0 and 0 as stated. There are no known exploits in the wild at this time.

Detailed information about CVE-2026-42499: CWE-407: Inefficient Algorithmic Complexity in Go standard library net/mail affecting Go standard library net/mail. G

CVE-2026-42499: CWE-407: Inefficient Algorithmic Complexity in Go standard library net/mail - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-42499: CWE-407: Inefficient Algorithmic Complexity in Go standard library net/mail


CVE-2026-39820: CWE-407: Inefficient Algorithmic Complexity in Go standard library net/mailCVE-2026-39820 0 Well-crafted inputs reaching ParseAddress, ParseAddressList, and ParseDate were able to trigger excessive CPU exhaustion and memory allocations. HighVulnerability#cve #cve-2026-39820 #cwe-407 Join the discussion	CVE Database V5	05/07/2026, 19:41:19 UTC Added: 05/07/2026, 20:06:25 UTC
CVE-2026-42499: CWE-407: Inefficient Algorithmic Complexity in Go standard library net/mailCVE-2026-42499 0 Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322. HighVulnerability#cve #cve-2026-42499 #cwe-407 Join the discussion	CVE Database V5	05/07/2026, 19:41:18 UTC Added: 05/07/2026, 20:06:25 UTC

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