mime up to 1.25.10/1.26.3 on Go Header algorithmic complexity

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.3$0-$5k0.00

Summaryinfo

A vulnerability was found in mime up to 1.25.10/1.26.3 on Go. It has been classified as problematic. This affects an unknown part of the component Header Handler. The manipulation leads to algorithmic complexity. This vulnerability is documented as CVE-2026-42504. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in mime up to 1.25.10/1.26.3 on Go and classified as problematic. This issue affects an unknown code block of the component Header Handler. The manipulation with an unknown input leads to a algorithmic complexity vulnerability. Using CWE to declare the problem leads to 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. Impacted is availability. The summary by CVE is:

Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.

It is possible to read the advisory at go.dev. The identification of this vulnerability is CVE-2026-42504 since 04/28/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 321018 (SUSE SLED15 / SLES15 Security Update : go1.26 (SUSE-SU-2026:2327-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.25.11 or 1.26.4 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (321018), EUVD (EUVD-2026-34039) and CERT Bund (WID-SEC-2026-1776). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Fedora Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Microsoft Azure Linux
  • Golang Go

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
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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: 🔒

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 321018
Nessus Name: SUSE SLED15 / SLES15 Security Update : go1.26 (SUSE-SU-2026:2327-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: mime 1.25.11/1.26.4

Timelineinfo

04/28/2026 CVE reserved
06/02/2026 +35 days VulDB entry created
06/03/2026 +0 days Advisory disclosed
07/20/2026 +47 days VulDB entry last update

Sourcesinfo

Advisory: go.dev
Status: Confirmed

CVE: CVE-2026-42504 (🔒)
GCVE (CVE): GCVE-0-2026-42504
GCVE (VulDB): GCVE-100-368051
EUVD: 🔒
CERT Bund: WID-SEC-2026-1776 - Golang Go: Mehrere Schwachstellen

Entryinfo

Created: 06/03/2026 01:39
Updated: 07/20/2026 14:23
Changes: 06/03/2026 01:39 (54), 06/03/2026 05:52 (1), 06/04/2026 09:48 (7), 06/07/2026 22:07 (11), 06/15/2026 04:35 (2), 07/20/2026 14:23 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Might our Artificial Intelligence support you?

Check our Alexa App!