Vulnerability · CVE-2026-93856

In OpenStack Cinder through 29.0.0, cross-project information disclosure can occur in the Messages API.

Published Oct 21, 2026 · catalog updated Oct 31, 2026 · In OpenStack Cinder through

Last checked Nov 3, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-93856. EPSS is 0.37%. Act only if a listed version of In OpenStack Cinder through is installed.

Gaps on this record

The stored product name is a package slug. The name on this page is taken from the title (In OpenStack Cinder through).
No vendor fix or required action is stored. Compare the linked advisory before you change production.

Severity: Medium4.3
Known exploitation: Not in CISA/VulnCheck KEV
EPSS: 0.37%
Remediation: Advisory link
Affected products: Debian:12 cinder · Debian:13 cinder · Debian:14 cinder

In OpenStack Cinder through 29.0.0, cross-project information disclosure can occur in the Messages API. A non-admin user with the project-scoped 'member' or 'reader' role making the Block Storage API v3.3 "List messages" call finds the non-expired user messages for other projects included in the response, resulting in the leakage of UUIDs of resources owned by other projects, in addition to the user message about the other projects' resources (which, by design, are sanitized generic messages). All Cinder deployments are affected.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

Debian:12 cinder2:21.1.0-3, 2:21.3.1-1~deb12u1, 2:22.0.0-1
Debian:13 cinder2:26.0.0-2, 2:27.0.0-1, 2:27.0.0-2
Debian:14 cinder0 → 2:29.0.0-3

How to fix CVE-2026-93856

Upgrade
CVE-2026-93856 lists a fix boundary at 2:29.0.0-3. Compare the installed build with that boundary before you change production.
Version check
Fixed in 2:29.0.0-3 · 6 other ranges on the advisory
Advisory
Open the cve_org record and follow its fix.
Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-93856. EPSS is 0.37%. Act only if a listed version of In OpenStack Cinder through is installed.

Which versions are affected?

Compare what you have installed with 2:21.1.0-3, 2:21.3.1-1~deb12u1, 2:22.0.0-1, 2:26.0.0-2, 2:27.0.0-1, 2:27.0.0-2, 0 → 2:29.0.0-3. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-669: Incorrect Resource Transfer Between Spheres. EPSS 0.37%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

Oct 21, 2026 · NIST NVD
Detected
In OpenStack Cinder through 29.0.0, cross-project information disclosure can occur in the Messages API. A non-admin user with the project-scoped 'member' or 'reader' role making the Block Storage API v3.3 "List messages" call finds the non-expired user messages for other projects included in the response, resulting in the leakage of UUIDs of resources owned by other projects, in addition to the us
Oct 21, 2026 · NIST NVD
Updated
In OpenStack Cinder through 29.0.0, cross-project information disclosure can occur in the Messages API. A non-admin user with the project-scoped 'member' or 'reader' role making the Block Storage API v3.3 "List messages" call finds the non-expired user messages for other projects included in the response, resulting in the leakage of UUIDs of resources owned by other projects, in addition to the us
Oct 21, 2026 · NIST NVD
Updated
In OpenStack Cinder through 29.0.0, cross-project information disclosure can occur in the Messages API. A non-admin user with the project-scoped 'member' or 'reader' role making the Block Storage API v3.3 "List messages" call finds the non-expired user messages for other projects included in the response, resulting in the leakage of UUIDs of resources owned by other projects, in addition to the us
Oct 31, 2026 · OpenSSF OSV / OSV Scanner
Fix available
cinder fixed in 2:29.0.0-3
Oct 31, 2026 · OpenSSF OSV / OSV Scanner
Fix available
cinder fixed in 2:29.0.0-3
Oct 31, 2026 · OpenSSF OSV / OSV Scanner
Updated
In OpenStack Cinder through 29.0.0, cross-project information disclosure can occur in the Messages API. A non-admin user with the project-scoped 'member' or 'reader' role making the Block Storage API v3.3 "List messages" call finds the non-expired user messages for other projects included in the response, resulting in the leakage of UUIDs of resources owned by other projects, in addition to the us

Sources

CVE.orgVulnerability recordCVE-2026-93856
Official CVE identifier
cve.org
FIRST EPSSExploitation probabilityCVE-2026-93856
30-day exploitation probability 0.37%
first.org
NIST NVDVulnerability recordCVE-2026-93856
In OpenStack Cinder through 29.0.0, cross-project information disclosure can occur in the Messages API. A non-admin user with the project-scoped 'member' or 'reader' role making the Block Storage API v3.3 "List messages" call finds the non-expired user messages for other projects
nvd.nist.gov
OpenSSF OSV / OSV ScannerPackage advisoryDEBIAN-CVE-2026-93856
osv.dev
Tenable CVE DatabaseVulnerability recordCVE-2026-93856
In OpenStack Cinder through 29.0.0, cross-project information disclosure can occur in the Messages API. A non-admin user with the project-scoped 'member' or 'reader' role making the Block Storage API v3.3 "List messages" call finds the non-expired user messages for other projects included in the response, resulting in the leakage of UUIDs of resources owned by other projects, in addition to the us
tenable.com

References

Freshness

Last verified in this catalog Nov 3, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

OpenSSF OSV / OSV ScannerOct 31, 2026
FIRST EPSSOct 28, 2026
Tenable CVE DatabaseOct 23, 2026
NIST NVDOct 21, 2026
CVE.orgOct 21, 2026

Priority score

18/100

Evidence confidence: High

Several independent sources name this vulnerability.

Confirmed exploitation0/30
EPSS probability1/20
CVSS severity6/15
Public exploit0/10
Internet exposure6/10
Product prevalence5/5
Detection0/5
Threat research0/5

Decision signals

Four separate signals — do not infer one from another.

Medium

CVSS severity
4.3 v3.1
Technical impact. Separate from exploitation likelihood.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
EPSS probability
0.37% · p31.04%
Estimated probability of exploitation within 30 days (FIRST).
Known exploitation
No verified KEV listing
Evidence from CISA KEV or VulnCheck KEV only — not from EPSS alone.
Patch availability
Advisory link
A patch or advisory reference is linked. Open the original publisher for availability by product version.

Stacks

Debian Debian 12 Debian 13 Debian 14 Linux

Weakness

CWE-669
Incorrect Resource Transfer Between Spheres
MITRE definition

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