CVE-2026-39820
Quadratic string concatentation in consumeComment in net/mail
Description
Well-crafted inputs reaching ParseAddress, ParseAddressList, and ParseDate were able to trigger excessive CPU exhaustion and memory allocations.
INFO
Published Date :
May 7, 2026, 8:16 p.m.
Last Modified :
May 13, 2026, 3:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update affected software to the latest version.
- Apply vendor-provided patches.
- Review input handling for resource limits.
Public PoC/Exploit Available at Github
CVE-2026-39820 has a 3 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-39820.
| URL | Resource |
|---|---|
| https://go.dev/cl/759940 | Patch |
| https://go.dev/issue/78566 | Issue Tracking |
| https://groups.google.com/g/golang-announce/c/qcCIEXso47M | Issue Tracking Mailing List |
| https://pkg.go.dev/vuln/GO-2026-4986 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-39820 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-39820
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Implementação de um sistema seguro de reserva de salas (Secure SDLC) envolvendo planejamento ágil, arquitetura DevOps, modelagem de ameaças e containerização com Docker e volumes persistentes.
devsecops docker-compose hackers-do-bem secure-sdlc threat-modeling
None
HCL Shell
This project provides a simple example of Spring Boot CRUD application with Postgres DB, docker-compose and LGTM Observability support
docker docker-compose grafana jdbc lgtm-stack makefile postgres spring-boot
Makefile Shell Dockerfile Java
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-39820 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-39820 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
May. 13, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-770 Added CPE Configuration OR *cpe:2.3:a:golang:go:*:*:*:*:*:*:*:* versions up to (excluding) 1.25.10 *cpe:2.3:a:golang:go:*:*:*:*:*:*:*:* versions from (including) 1.26.0 up to (excluding) 1.26.3 Added Reference Type Go Project: https://go.dev/cl/759940 Types: Patch Added Reference Type Go Project: https://go.dev/issue/78566 Types: Issue Tracking Added Reference Type Go Project: https://groups.google.com/g/golang-announce/c/qcCIEXso47M Types: Issue Tracking, Mailing List Added Reference Type Go Project: https://pkg.go.dev/vuln/GO-2026-4986 Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 08, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H -
New CVE Received by [email protected]
May. 07, 2026
Action Type Old Value New Value Added Description Well-crafted inputs reaching ParseAddress, ParseAddressList, and ParseDate were able to trigger excessive CPU exhaustion and memory allocations. Added Reference https://go.dev/cl/759940 Added Reference https://go.dev/issue/78566 Added Reference https://groups.google.com/g/golang-announce/c/qcCIEXso47M Added Reference https://pkg.go.dev/vuln/GO-2026-4986