S3 SSE-C Encryption Key Exposed in Plaintext via Config Endpoint (CVE-2025-41118 Pattern)
Priority LOW 38CWE-326Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Partial Red Hat: 3 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-326.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00161 5th percentileScored 2026-11-07
Fix Partial github.com/grafana/tempo (Go): 2.10.3Red Hat: 3 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Grafana | Tempo | 2.10.3 | — | No fix listed | CNA |
| — | github.com/grafana/tempo (Go) | before 2.10.3 | 2.10.3 | Patch available | GHSA-ffqx-q65f-36jf |
- Tempo VendorGrafana Affected 2.10.3 Fixed in — No fix listed CNA
- github.com/grafana/tempo (Go) Vendor— Affected before 2.10.3 Fixed in 2.10.3 Patch available GHSA-ffqx-q65f-36jf
Remediation
- Fix · GHSA-ffqx-q65f-36jf github.com/grafana/tempo (Go) Fixed in 2.10.3 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Not affected: 1 product
- Red Hat Advanced Cluster Management for Kubernetes 2
Timeline
- 2026-10-02 Threatist record created from CVE-2026-28377
- 2026-10-03 Alias added: GHSA-ffqx-q65f-36jf
References
Advisory 3
More Grafana Tempo vulnerabilities
- TI-2026-17501 Tempo query limit results in unbounded memory allocation CVSS 3.1HIGH 7.5
- TI-2026-22222 Tempo TraceQL query with exemplar hint could result in unbounded memory usage CVSS 3.1MEDIUM 6.5
Sources
- CVE-2026-28377 · CVE Program
- CVE-2026-28377 · NVD
- FIRST EPSS
- GHSA-ffqx-q65f-36jf · GitHub Advisory Database · CC BY 4.0
- CVE-2026-28377 · Red Hat security data · CC BY 4.0
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