CVE-2026-28377

High

Description

A vulnerability in Grafana Tempo exposes the S3 SSE-C encryption key in plaintext through the /status/config endpoint, potentially allowing unauthorized users to obtain the key used to encrypt trace data stored in S3. Thanks to william_goodfellow for reporting this vulnerability.

SeverityHigh

CVSS7.5

Exploit probability—

Product

Grafana Tempo

PublishedMar 26, 2026

First seenMar 26, 2026

Weakness typeCWE-326CWE-326

How to fix

Update

grafana tempo2.10.3 or later
github.com/grafana/tempo2.10.3 or later

Vendor advisories

grafana.com/security/security-advisories/cve-2026-28377

Affected products

Product	Affected versions	Fixed in
grafana tempo	v < 2.10.3	2.10.3
github.com/grafana/tempoGo	v < 2.10.3, No range specified	2.10.3

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.