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

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Summary

CVECVE-2026-42507
StatePUBLISHED
AssignerGo
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-02 23:16:38 UTC
Updated2026-06-03 20:16:20 UTC
DescriptionWhen 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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from ADP

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

EPSS: 0.000180000 probability, percentile 0.047770000 (date 2026-06-03)

Problem Types: CWE-532: Insertion of Sensitive Information into Log File

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Go Standard Library Net/textproto affected 1.25.11 semver Not specified
CNA Go Standard Library Net/textproto affected 1.26.0-0 1.26.4 semver Not specified

References

ReferenceSourceLinkTags
go.dev/issue/79346 [email protected] go.dev
go.dev/cl/777060 [email protected] go.dev
groups.google.com/g/golang-announce/c/tKs3rmcBcKw [email protected] groups.google.com
pkg.go.dev/vuln/GO-2026-5039 [email protected] pkg.go.dev
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