CVE-2026-28377

highpriority · track · 0OT risk · elevatedEPSS 0.002 · 5 %ileDEEURUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.16% (5th) EPSS
CVSS 7.5 · high
Is it mine?
12 products
Check your exposure
Who says so?
7 sources
cnnvd · enisa_euvd · fstec_bdu · osv

EPSS · scored 2026-10-27

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.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • Fixedtempo-cli-0:2.10.3-1.1.aarch64 as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedtempo-cli-0:2.10.3-1.1.ppc64le as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedtempo-cli-0:2.10.3-1.1.s390x as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedtempo-cli-0:2.10.3-1.1.x86_64 as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

02

cvss

Technical severity, 0–10. One row per scoring source.

7.5
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · FSTEC (BDU) RU
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · ENISA EU
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · security@grafana.comexploitability 3.9 · impact 3.6
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · OSV
v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-312USCWE-326USCWE-326US
05

affected products (12)

Products and version ranges known to be affected.

06

advisories (4)

Vendor and ecosystem advisories describing this.

  • WID-SEC-W-2026-0764Grafana Tempo: Schwachstelle ermöglicht Offenlegung von InformationenDeutsch2026-03-17csaf · cert_bundDE

    Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Grafana Tempo ausnutzen, um Informationen offenzulegen.

  • openSUSE-SU-2026:10390-1tempo-cli-2.10.3-1.1 on GA media2026-03-18csaf · suse_csafDE

    tempo-cli-2.10.3-1.1 on GA media

  • GHSA-ffqx-q65f-36jfGrafana Tempo has Inadequate Encryption Strength2026-03-27ghsa · osvUS

    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.

  • GO-2026-5359Grafana Tempo has Inadequate Encryption Strength in github.com/grafana/tempo2026-06-25vendor · osvUS

    Grafana Tempo has Inadequate Encryption Strength in github.com/grafana/tempo. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. (If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.) The additional affected modules and versions are: github.com/grafana/tempo before v2.10.3.

07

also known as (6)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bduosvcert_bundnvdsuse_csafNVDCVE.orgMITRE
published 2026-03-26modified 2026-06-17
09

references (3)

External citations — patches, advisories, analysis.

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