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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

This is a denial-of-service issue in Svelte’s devalue library. If an application uses vulnerable devalue.parse on externally supplied data, crafted input can make the process spend excessive CPU or memory, potentially disrupting the service. The fix is devalue 5.6.2.

Executive priority

Prioritize remediation for internet-facing or partner-facing services using devalue.parse on user-controlled data. Internal-only use without untrusted parsing is lower urgency but should still be upgraded during normal dependency maintenance.

Technical view

devalue versions 5.3.0 through 5.6.1 can exhaust CPU or memory during devalue.parse. The root cause is typed array hydration assuming an ArrayBuffer without validating that assumption before typed array creation. Impact is availability only, with CVSS 7.5 AV:N/AC:L/PR:N/UI:N.

Likely exposure

Exposure is limited to applications that include sveltejs devalue >=5.3.0 and <5.6.2 and call devalue.parse on externally supplied or otherwise untrusted data.

Exploitation context

The provided sources do not show CISA KEV listing or confirmed active exploitation. Exploitation appears network-reachable only when an application exposes a path that feeds attacker-controlled input into devalue.parse.

Researcher notes

The vulnerable condition is specific to parse-time typed array hydration and unchecked ArrayBuffer assumptions. The public bundle identifies the affected range, fixed release, commit, CVSS vector, and Red Hat references, but does not provide evidence of active exploitation.

Mitigation direction

  • Upgrade devalue to version 5.6.2 or later.
  • Review lockfiles and transitive dependencies for vulnerable devalue versions.
  • Avoid parsing externally supplied devalue data until upgraded.
  • Apply relevant downstream vendor advisories where devalue is packaged.
  • Use request size and rate limits on parsing endpoints.

Validation and detection

  • Confirm resolved devalue version is 5.6.2 or later.
  • Identify all code paths that invoke devalue.parse.
  • Verify whether those paths accept external or untrusted input.
  • Review service metrics for parsing-related CPU or memory spikes.
  • Check Red Hat advisory applicability for affected packaged products.
Prepared
Confidence
high
Sources
9

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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