How severe is CVE-2026-9137?

CVE-2026-9137 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-2026-9137 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.

What products are affected by CVE-2026-9137?

CVE-2026-9137 affects Misp-project Misp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-9137?

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-2026-9137 have an EU (EUVD) identifier?

Yes. CVE-2026-9137 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31155.

When was CVE-2026-9137 published?

CVE-2026-9137 was published on 2026-05-20 and last updated on 2026-06-22.

CVE-2026-9137

CVE-2026-9137 is a high-severity vulnerability in Misp-project Misp 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-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 5.1
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31155
Weakness: CWE-400
Affected product: Misp-project Misp
Published: 2026-05-20
Last modified: 2026-06-22

Description

The CSP report endpoint in MISP intended to limit logged CSP reports to 1 KB but incorrectly allowed reports up to 1 MB before truncation. On deployments where the endpoint is reachable by untrusted clients, this could allow attackers to generate excessive log volume and contribute to resource exhaustion or log flooding.

Frequently asked questions

What is CVE-2026-9137?: The CSP report endpoint in MISP intended to limit logged CSP reports to 1 KB but incorrectly allowed reports up to 1 MB before truncation. On deployments where the endpoint is reachable by untrusted clients, this could allow attackers to generate excessive log volume and contribute to resource exhaustion or log flooding.
How severe is CVE-2026-9137?: CVE-2026-9137 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-2026-9137 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.
What products are affected by CVE-2026-9137?: CVE-2026-9137 affects Misp-project Misp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-9137?: 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-2026-9137 have an EU (EUVD) identifier?: Yes. CVE-2026-9137 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31155.
When was CVE-2026-9137 published?: CVE-2026-9137 was published on 2026-05-20 and last updated on 2026-06-22.

References

https://github.com/MISP/MISP/commit/02932cccab230b295afcaf5aa05e363d30db0ec9

Affected products (1)

cpe:2.3:a:misp-project:misp:*:*:*:*:*:*:*:*

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