net-mail up to 1.25.9/1.26.2 on Go Email Address algorithmic complexity

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.72

Summaryinfo

A vulnerability classified as problematic was found in net-mail up to 1.25.9/1.26.2 on Go. Affected by this issue is some unknown functionality of the component Email Address Handler. The manipulation results in algorithmic complexity. This vulnerability is identified as CVE-2026-42499. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, was found in net-mail up to 1.25.9/1.26.2 on Go. Affected is an unknown function of the component Email Address Handler. The manipulation with an unknown input leads to a algorithmic complexity vulnerability. CWE is classifying the issue as CWE-407. An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached. This is going to have an impact on availability. CVE summarizes:

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

The advisory is shared for download at go.dev. This vulnerability is traded as CVE-2026-42499 since 04/28/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 313238 (Linux Distros Unpatched Vulnerability : CVE-2026-42499), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.25.10 or 1.26.3 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (313238), EUVD (EUVD-2026-28432) and CERT Bund (WID-SEC-2026-1437). Once again VulDB remains the best source for vulnerability data.

Affected

  • Splunk Splunk Enterprise
  • Red Hat Enterprise Linux
  • Google Container-Optimized OS
  • Amazon Linux 2
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Microsoft Azure Linux
  • Golang Go
  • Red Hat OpenShift

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

ADP CISA Base Score: 7.5
ADP CISA Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Algorithmic complexity
CWE: CWE-407 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 313238
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-42499

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: net-mail 1.25.10/1.26.3

Timelineinfo

04/28/2026 CVE reserved
05/07/2026 +9 days Advisory disclosed
05/07/2026 +0 days VulDB entry created
07/20/2026 +74 days VulDB entry last update

Sourcesinfo

Advisory: go.dev
Status: Confirmed

CVE: CVE-2026-42499 (🔒)
GCVE (CVE): GCVE-0-2026-42499
GCVE (VulDB): GCVE-100-361956
EUVD: 🔒
CERT Bund: WID-SEC-2026-1437 - Golang Go: Mehrere Schwachstellen

Entryinfo

Created: 05/07/2026 22:35
Updated: 07/20/2026 14:23
Changes: 05/07/2026 22:35 (54), 05/08/2026 01:50 (1), 05/09/2026 00:43 (2), 05/09/2026 01:00 (7), 06/19/2026 18:24 (1), 07/02/2026 10:11 (11), 07/20/2026 14:23 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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