How severe is CVE-2026-34752?

CVE-2026-34752 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-34752 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34752?

CVE-2026-34752 affects Haraka Project Haraka. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34752?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-34752 have an EU (EUVD) identifier?

Yes. CVE-2026-34752 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18509.

When was CVE-2026-34752 published?

CVE-2026-34752 was published on 2026-04-02 and last updated on 2026-06-17.

CVE-2026-34752

CVE-2026-34752 is a high-severity vulnerability in Haraka Project Haraka with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-248.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 8.7
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18509
Weakness: CWE-248
Affected product: Haraka Project Haraka
Published: 2026-04-02
Last modified: 2026-06-17

Description

Haraka is a Node.js mail server. Prior to version 3.1.4, sending an email with __proto__: as a header name crashes the Haraka worker process. This issue has been patched in version 3.1.4.

Frequently asked questions

What is CVE-2026-34752?: Haraka is a Node.js mail server. Prior to version 3.1.4, sending an email with __proto__: as a header name crashes the Haraka worker process. This issue has been patched in version 3.1.4.
How severe is CVE-2026-34752?: CVE-2026-34752 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-34752 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34752?: CVE-2026-34752 affects Haraka Project Haraka. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34752?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-34752 have an EU (EUVD) identifier?: Yes. CVE-2026-34752 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18509.
When was CVE-2026-34752 published?: CVE-2026-34752 was published on 2026-04-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:haraka_project:haraka:*:*:*:*:*:node.js:*:*

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