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CVE Record

CVE-2026-22774: devalue vulnerable to denial of service due to memory exhaustion in devalue.parse

Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. From 5.3.0 to 5.6.1, certain inputs can cause devalue.parse to consume excessive CPU time and/or memory, potentially leading to denial of service in systems that parse input from untrusted sources. This affects applications using devalue.parse on externally-supplied data. The root cause is the typed array hydration expecting an ArrayBuffer as input, but not checking the assumption before creating the typed array. This vulnerability is fixed in 5.6.2.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2026-22774 can let an unauthenticated remote sender make affected applications consume excessive CPU or memory, causing denial of service. The risk applies when applications use Svelte devalue.parse on data supplied by outsiders. The vulnerable devalue range is 5.3.0 through 5.6.1, and the source bundle states it is fixed in 5.6.2.

Executive priority

Treat as a high-priority availability risk for internet-facing or API-driven services using devalue.parse. It does not indicate data theft or code execution, but service disruption may be possible without authentication. Patch affected applications during the next urgent maintenance window.

Technical view

Svelte devalue versions >=5.3.0 and <5.6.2 mishandle certain inputs in devalue.parse. The typed array hydration path expects an ArrayBuffer but does not verify that assumption before creating the typed array, enabling CPU and/or memory exhaustion. CVSS 3.1 is 7.5, AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Likely exposure

Exposure is likely in JavaScript or Node.js applications that depend on devalue 5.3.0 to 5.6.1 and call devalue.parse on externally supplied data. Internal-only parsing or versions 5.6.2 and later are less likely to be exposed based on provided sources.

Exploitation context

The CVSS vector indicates remote, low-complexity, unauthenticated exploitation with no user interaction. The impact is availability only. The bundle does not indicate CISA KEV listing or active exploitation, so active exploitation should not be assumed.

Researcher notes

Focus review on typed array hydration behavior and whether application-controlled data reaches devalue.parse. The public advisory and fix identify missing type validation before typed array creation. Do not infer broader Svelte framework exposure unless devalue.parse and vulnerable versions are present.

Mitigation direction

  • Upgrade sveltejs devalue to version 5.6.2 or later.
  • Prioritize services parsing externally supplied data with devalue.parse.
  • Review Red Hat errata if using affected Red Hat-distributed packages.
  • If immediate upgrade is blocked, follow vendor guidance and reduce untrusted parsing exposure.

Validation and detection

  • Inventory direct and transitive devalue dependencies in application manifests and lockfiles.
  • Confirm deployed versions are not >=5.3.0 and <5.6.2.
  • Identify code paths calling devalue.parse on external input.
  • Verify production builds include the upgraded dependency version.
Prepared
Confidence
high
Sources
7

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

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ATT&CK lookup starting points

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cwe · low confidence lookup

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cve · low confidence lookup

CVE-2026-22774 mapping review

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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
9Source 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:H3.93.6GitHub_M
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-2026-22774Attack 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-SADPdevalue: devalue: Denial of Service due to excessive resource consumption from untrusted input
other:Red Hat severity ratingcvssV3_1
  • 2026-01-15T19:01:29.258Z: Reported to Red Hat.
  • 2026-01-15T18:53:21.963Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
sveltejsdevalue>= 5.3.0, < 5.6.2Listed
Weakness

CWE details

CWE-405

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CWE-405 · source CWE mapping

Asymmetric Resource Consumption (Amplification)

Asymmetric Resource Consumption (Amplification) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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