CVE-2026-42507

CVE-2026-42507 is a medium-severity vulnerability with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

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.

Frequently asked questions

What is CVE-2026-42507?
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.
How severe is CVE-2026-42507?
CVE-2026-42507 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-42507 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-42507?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-42507 have an EU (EUVD) identifier?
Yes. CVE-2026-42507 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34040.
When was CVE-2026-42507 published?
CVE-2026-42507 was published on 2026-06-02 and last updated on 2026-06-17.

References