CVE-2026-42507

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

State: Published
Severity: 5.3 Medium
Published: Jun 2, 2026
Updated: Jun 3, 2026
Reserved: Apr 28, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N	CISA-ADP

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
net/textprotoGo standard library	before 1.25.11Affected 1.26.0-0 to before 1.26.4Affected

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

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