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CVE Record

CVE-2026-27880: OpenFeature evaluation API reads input data with no bounds

The OpenFeature feature toggle evaluation endpoint reads unbounded values into memory, which can cause out-of-memory crashes.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A remote user may be able to make affected Grafana servers consume excessive memory through the OpenFeature feature-toggle evaluation endpoint. The resulting out-of-memory condition can crash the service, disrupting monitoring availability and dependent operations. The supplied evidence describes an availability failure only; it does not establish data theft or modification.

Executive priority

Prioritize prompt validation for externally reachable or operationally critical Grafana instances. An affected service could be remotely crashed without authentication, but the supplied sources do not indicate data theft, tampering, or active exploitation. Follow Grafana's advisory for remediation details because the bundle does not name a fixed release.

Technical view

The OpenFeature evaluation endpoint reads input values into memory without bounds. Oversized input can exhaust available memory and crash Grafana. The supplied CVSS 3.1 score is 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), indicating remotely reachable, low-complexity denial of service without stated confidentiality or integrity impact.

Likely exposure

The bundle identifies Grafana v12.1.0, v12.2.0, v12.3.0, and v12.4.0. Risk depends on whether the OpenFeature evaluation endpoint is deployed and remotely reachable. No other versions or products are established as affected; the bundle marks the default status as unaffected.

Exploitation context

The CVSS vector indicates remote, low-complexity, unauthenticated exploitation requiring no user interaction. The supplied bundle says KEV is false and provides no evidence of active exploitation or public weaponization. Treat this as a denial-of-service risk, not evidence of compromise or data exposure.

Researcher notes

The description most directly supports CWE-770 resource exhaustion; the bundle also lists CWE-125. Exact request limits, vulnerable code paths, deployment prerequisites, fixed releases, and vendor mitigations are not provided here. Researchers should consult the vendor advisory and CVE record without assuming broader version ranges.

Mitigation direction

  • Review Grafana's advisory for fixed versions or vendor-approved mitigations before changing production.
  • Apply a vendor-supported update when Grafana identifies the appropriate corrected release.
  • Restrict untrusted access to the OpenFeature evaluation endpoint where operationally feasible.
  • Monitor Grafana memory consumption and restart behavior until remediation is confirmed.

Validation and detection

  • Inventory Grafana instances and compare their exact versions with the four listed affected versions.
  • Determine whether the OpenFeature evaluation endpoint is enabled and reachable from untrusted networks.
  • Review logs and monitoring for memory exhaustion, process termination, or repeated Grafana restarts.
  • After remediation, confirm the deployed version or configuration matches current Grafana guidance.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-125: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cwe · low confidence lookup

CWE-770: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-27880 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
5Timeline events
2ADP providers
5Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: partial

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6GRAFANA
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2026-27880Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Made public.

  3. CVE publishedCVE Program

    The CVE record was published.

  4. ADP timelineredhat-SADP

    Reported to Red Hat.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPGrafana: Grafana: Denial of Service via unbounded memory read in feature toggle evaluation
other:Red Hat severity ratingcvssV3_1
  • 2026-03-27T15:03:43.019Z: Reported to Red Hat.
  • 2026-03-27T14:12:20.075Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
GrafanaGrafanav12.1.0, v12.2.0, v12.3.0, v12.4.0unaffected
Weakness

CWE details

CWE-125CWE-770

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-125 · source CWE mapping

Out-of-bounds Read

Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs
CWE-770 · source CWE mapping

Allocation of Resources Without Limits or Throttling

Allocation of Resources Without Limits or Throttling represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs