How severe is CVE-2026-42335?

CVE-2026-42335 has a CVSS 4.0 base score of 6.3, rated medium severity.

Is CVE-2026-42335 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-42335?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-42335 have an EU (EUVD) identifier?

Yes. CVE-2026-42335 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31983.

When was CVE-2026-42335 published?

CVE-2026-42335 was published on 2026-05-26 and last updated on 2026-06-17.

CVE-2026-42335

CVE-2026-42335 is a medium-severity vulnerability with a CVSS 4.0 base score of 6.3. 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-918.

Key facts

Severity: Medium (CVSS 4.0 base score 6.3)
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31983
Weakness: CWE-918
Published: 2026-05-26
Last modified: 2026-06-17

Description

MaxKB is an open-source AI assistant for enterprise. Prior to 2.8.1, MaxKB v2.8.0 and prior are vulnerable to a server-side request forgery (SSRF) bypass in the OSS file service URL fetch (chat/api/oss/get_url) endpoint. The vulnerability exists due to inconsistent URL parsing between the urlparse validation function and the requests HTTP client, allowing attackers to access internal network services. This vulnerability is fixed in 2.8.1.

Frequently asked questions

What is CVE-2026-42335?: MaxKB is an open-source AI assistant for enterprise. Prior to 2.8.1, MaxKB v2.8.0 and prior are vulnerable to a server-side request forgery (SSRF) bypass in the OSS file service URL fetch (chat/api/oss/get_url) endpoint. The vulnerability exists due to inconsistent URL parsing between the urlparse validation function and the requests HTTP client, allowing attackers to access internal network services. This vulnerability is fixed in 2.8.1.
How severe is CVE-2026-42335?: CVE-2026-42335 has a CVSS 4.0 base score of 6.3, rated medium severity.
Is CVE-2026-42335 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-42335?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-42335 have an EU (EUVD) identifier?: Yes. CVE-2026-42335 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31983.
When was CVE-2026-42335 published?: CVE-2026-42335 was published on 2026-05-26 and last updated on 2026-06-17.

References

https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-r8hf-mwwr-hxgc

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