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CVE-2026-42507— Arbitrary inputs are included in errors without any escaping in net/textproto

Quick assessment

Affected
Go standard library net/textproto
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Google Go是美国谷歌（Google）公司的一种静态强类型、编译型、并发型，并具有垃圾回收功能的编程语言。 Google Go存在安全漏洞，该漏洞源于返回错误时函数将输入包含在错误中，可能导致攻击者向打印或记录的错误中注入误导内容。

AI Predicted 4.3 Difficulty: Trivial EPSS 0.37% · P30

Possible ATT&CK Techniques 1 AI

T1562.001

Affected Version Matrix 2

VendorProduct Version RangeStatus
Go standard library net/textproto < 1.25.11 affected
1.26.0-0< 1.26.4 affected
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I. Basic Information for CVE-2026-42507

Vulnerability Information
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Vulnerability Title
Arbitrary inputs are included in errors without any escaping in net/textproto
Source: CVE Program / CVE List V5
Vulnerability Description
When returning errors, functions in the net/textproto package would include its input as part of the error. This might allow an attacker to inject misleading content to errors that are printed or logged.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Google Go 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google Go是美国谷歌（Google）公司的一种静态强类型、编译型、并发型，并具有垃圾回收功能的编程语言。 Google Go存在安全漏洞，该漏洞源于返回错误时函数将输入包含在错误中，可能导致攻击者向打印或记录的错误中注入误导内容。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Go standard library net/textproto 0 ~ 1.25.11 -

II. Public POCs for CVE-2026-42507

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III. Intelligence Information for CVE-2026-42507

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Patches & Fixes for CVE-2026-42507 (1)

News Coverage for CVE-2026-42507 (1)

Vendor Pages for CVE-2026-42507 (1)

Other References for CVE-2026-42507 (1)

Same Patch Batch · Go standard library · 2026-06-02 · 3 CVEs total

CVE-2026-42504 Quadratic complexity in WordDecoder.DecodeHeader in mime
CVE-2026-27145 Inefficient candidate hostname parsing in crypto/x509

IV. Related Vulnerabilities

Same product: net/textproto
Same vendor: Go standard library

V. Comments for CVE-2026-42507

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