How severe is CVE-2026-33222?

CVE-2026-33222 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-33222 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33222?

CVE-2026-33222 affects Linuxfoundation Nats-server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33222?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-33222 have an EU (EUVD) identifier?

Yes. CVE-2026-33222 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-15994.

When was CVE-2026-33222 published?

CVE-2026-33222 was published on 2026-03-25 and last updated on 2026-06-17.

CVE-2026-33222

CVE-2026-33222 is a medium-severity vulnerability in Linuxfoundation Nats-server with a CVSS 3.x base score of 4.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-285.

Key facts

Severity: Medium (CVSS 3.x base score 4.9)
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-15994
Weakness: CWE-285
Affected product: Linuxfoundation Nats-server
Published: 2026-03-25
Last modified: 2026-06-17

Description

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, users with JetStream admin API access to restore one stream could restore to other stream names, impacting data which should have been protected against them. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, if developers have configured users to have limited JetStream restore permissions, temporarily remove those permissions.

Frequently asked questions

What is CVE-2026-33222?: NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, users with JetStream admin API access to restore one stream could restore to other stream names, impacting data which should have been protected against them. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, if developers have configured users to have limited JetStream restore permissions, temporarily remove those permissions.
How severe is CVE-2026-33222?: CVE-2026-33222 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-33222 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33222?: CVE-2026-33222 affects Linuxfoundation Nats-server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33222?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-33222 have an EU (EUVD) identifier?: Yes. CVE-2026-33222 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-15994.
When was CVE-2026-33222 published?: CVE-2026-33222 was published on 2026-03-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*

More vulnerabilities in Linuxfoundation Nats-server

CVE-2022-28357 — Critical (CVSS 9.8): NATS nats-server 2.2.0 through 2.7.4 allows directory traversal because of an unintended path to a management action…
CVE-2020-26892 — Critical (CVSS 9.8): The JWT library in NATS nats-server before 2.1.9 has Incorrect Access Control because of how expired credentials are…
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CVE-2026-33216 — High (CVSS 8.6): NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions…
CVE-2026-33218 — High (CVSS 7.5): NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions…
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