How severe is CVE-2026-39197?

CVE-2026-39197 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-39197 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-39197?

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

Does CVE-2026-39197 have an EU (EUVD) identifier?

Yes. CVE-2026-39197 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36763.

When was CVE-2026-39197 published?

CVE-2026-39197 was published on 2026-06-15 and last updated on 2026-06-17.

CVE-2026-39197

CVE-2026-39197 is a medium-severity vulnerability with a CVSS 3.x base score of 6.5. 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: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36763
Weakness: CWE-400
Published: 2026-06-15
Last modified: 2026-06-17

Description

An issue in the /util/http/prelude.rs endpoint of Datadog, Inc Vector v0.54.0 allows attackers to cause a Denial of Service (DoS) via a crafted request or payload.

Frequently asked questions

What is CVE-2026-39197?: An issue in the /util/http/prelude.rs endpoint of Datadog, Inc Vector v0.54.0 allows attackers to cause a Denial of Service (DoS) via a crafted request or payload.
How severe is CVE-2026-39197?: CVE-2026-39197 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-39197 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-39197?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-39197 have an EU (EUVD) identifier?: Yes. CVE-2026-39197 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36763.
When was CVE-2026-39197 published?: CVE-2026-39197 was published on 2026-06-15 and last updated on 2026-06-17.

References

https://gist.github.com/pyuysig/221e90dd598ab3f3c3100ae59db8e8d4

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