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

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.

Published: 2026-06-02 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Awaiting Analysis，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-42507 is rated Low Risk (31.4/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.37%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-42507

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-23 0.26% 0.37% +0.11%
2 2026-06-15 0.02% 0.26% +0.24%
3 2026-06-03 — 0.02% —

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-42507

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 1.4 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2026-42507

GitHub Security Advisory for CVE-2026-42507

GHSA-h3gm-q7m7-mp28 · Severity: medium — When returning errors, functions in the net/textproto package would include its input as part of...

OS Trackers for CVE-2026-42507

vendor priority summary link
debian not yet assigned CVE-2026-42507 not yet assigned priority: Debian including 5 source packages (golang-1.15, golang-1.19, golang-1.24, golang-1.25, golang-1.26), 7 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 4, open 3. https://security-tracker.debian.org/tracker/CVE-2026-42507
suse medium CVE-2026-42507 severity moderate: SUSE including 3 source package names (go, go-doc, go-race), 30 product×package rows across 14 product lines (SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS, SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS, … (14 product lines)): Known Not Affected 30. https://www.suse.com/security/cve/CVE-2026-42507/
ubuntu medium CVE-2026-42507 medium priority: Ubuntu including 3 source packages (golang-1.24, golang-1.25, golang-1.26), 15 status rows across 5 suites (jammy, noble, questing, resolute, upstream): needs-triage 10, DNE 5. https://ubuntu.com/security/CVE-2026-42507

Affected software / configurations for CVE-2026-42507

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2026-42507

cvelogic Threat Intelligence