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

CVSS Meta Temp Score
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CTI Interest Score
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6.7$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in net-mail up to 1.25.9/1.26.2 on Go. Affected is an unknown function. Executing a manipulation can lead to algorithmic complexity. The identification of this vulnerability is CVE-2026-39820. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic was found in net-mail up to 1.25.9/1.26.2 on Go. This vulnerability affects an unknown code block. The manipulation with an unknown input leads to a algorithmic complexity vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability. CVE summarizes:

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

The advisory is available at go.dev. This vulnerability was named CVE-2026-39820 since 04/07/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 315061 (SUSE SLED15 / SLES15 Security Update : go1.25 (SUSE-SU-2026:1862-1)), 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 (315061), EUVD (EUVD-2026-28423) and CERT Bund (WID-SEC-2026-1437). If you want to get best quality of vulnerability data, you may have to visit VulDB.

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: 6.8
VulDB Meta Temp Score: 6.7

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

NVD Base Score: 7.5
NVD Vector: 🔒

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: 315061
Nessus Name: SUSE SLED15 / SLES15 Security Update : go1.25 (SUSE-SU-2026:1862-1)

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

04/07/2026 CVE reserved
05/07/2026 +30 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-2026-39820 (🔒)
GCVE (CVE): GCVE-0-2026-39820
GCVE (VulDB): GCVE-100-361954
EUVD: 🔒
CERT Bund: WID-SEC-2026-1437 - Golang Go: Mehrere Schwachstellen

Entryinfo

Created: 05/07/2026 22:34
Updated: 07/20/2026 14:06
Changes: 05/07/2026 22:34 (53), 05/08/2026 02:32 (1), 05/09/2026 01:00 (7), 05/16/2026 19:57 (2), 06/19/2026 18:24 (1), 07/02/2026 10:11 (20), 07/10/2026 09:43 (1), 07/20/2026 14:06 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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