CVE-2026-27571

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.54% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 45.3% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-02-24 15:59Z8 MO AGO

Last updated

2026-02-26 21:33Z8 MO AGO

Reserved

2026-02-20

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Medium (CVSS 5.9)

CNA CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses

• CWE-409Improper Handling of Highly Compressed Data (Data Amplification)Base
• CWE-770Allocation of Resources Without Limits or ThrottlingBase

Data version

5.2

Document digest

33066a3176584f1ebe299207ca5193b77fdf8bcf76486aab62535093e85409e6

• github.comhttps://github.com/nats-io/nats-server/security/advisories/GHSA-qrvq-68c2-7grwx_refsource_CONFIRM
• github.comhttps://github.com/nats-io/nats-server/commit/f77fb7c4535e6727cc1a2899cd8e6bbdd8ba2017x_refsource_MISC
• github.comhttps://github.com/nats-io/nats-server/releases/tag/v2.11.12x_refsource_MISC
• github.comhttps://github.com/nats-io/nats-server/releases/tag/v2.12.3x_refsource_MISC