Is CVE-2026-27878 in the CISA KEV catalog?

No. CVE-2026-27878 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-27878?

CVE-2026-27878 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2026-27878?

CVE-2026-27878 has an EPSS score of 0.24% (14th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-27878?

Upgrade tempo to 2.10.2 or later.

CVE & CISA-KEV Catalog

CVE-2026-27878

MEDIUM

6.5

CVSS v3

NVD

Description

A TraceQL query in Grafana Tempo with a large exemplars hint value can cause the Tempo instance to allocate an excessive amount of memory, resulting in an out-of-memory crash. This could allow an authenticated user to trigger a denial of service against the Tempo service.

CWE-400Resource Exhaustion

How to fix

Remediation Available

tempoNVD

Affected:>= 2.10.0, < 2.10.2Fixed in:2.10.2CVE-2026-27878derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

0.24%probability of exploitation in 30 days

14thpercentile

Low risk: more likely to be exploited than 14% of all known CVEs.

References

Other references1

grafana.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-29.