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

cve-program · severity unknownCVSS unknownCheck source for fixed versionsKEV status unknown

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-42507

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-42507

Published

net/textproto

https://pkg.go.dev

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Go standard library",
                    "product": "net/textproto",
                    "collectionURL": "https://pkg.go.dev",
                    "packageName": "net/textproto",
                    "versions": [
                        {
                            "version": "0",
                            "lessThan": "1.25.11",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "1.26.0-0",
                            "lessThan": "1.26.4",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ],
                    "programRoutines": [
                        {
                            "name": "parseCodeLine"
                        },
                        {
                            "name": "Reader.ReadCodeLine"
                        },
                        {
                            "name": "readMIMEHeader"
                        },
                        {
                            "name": "Error.Error"
                        },
                        {
                            "name": "Reader.ReadMIMEHeader"
                        },
                        {
                            "name": "Reader.ReadResponse"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON

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Sources read 12 Nov 17:32 UTC · 274 of 275 readable · 272 fully read · documentation 469/469 current