CVE-2026-42507

MEDIUM

Arbitrary inputs are included in errors without any escaping in net/textproto

Title source: cna

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.

References (4)

Core 4

Core References

https://go.dev/issue/79346

https://go.dev/cl/777060

https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw

https://pkg.go.dev/vuln/GO-2026-5039

Scores

CVSS v3 5.3

EPSS 0.0026

EPSS Percentile 17.5%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

Status published

Products (2)

Go standard library/net/textproto < 1.25.11

Go standard library/net/textproto 1.26.0-0 - 1.26.4

Published Jun 02, 2026

Tracked Since Jun 03, 2026