Svelte devalue: DoS via malformed input
Exploitation and risk
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cve-program · CVE-2026-81176
PublishedSvelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. Prior to 5.9.2, devalue.parse does not reject out-of-bounds indices that are greater than or equal to values.length in src/parse.js. A specially crafted untrusted payload can make the parser alternate between array representations, producing quadratic work as the payload grows and causing denial of service in applications that parse untrusted devalue data. This issue is fixed in version 5.9.2.
- Source published
- 16 Sep 2026 18:34:34 UTC
- Source modified
- 17 Sep 2026 19:25:51 UTC
- Saved here
- 23 Oct 2026 15:48:27 UTC
- Source terms
- CVE Program Terms of Use
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CVSS 3.1 · 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
euvd · EUVD-2026-80943
PublishedSvelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. Prior to 5.9.2, devalue.parse does not reject out-of-bounds indices that are greater than or equal to values.length in src/parse.js. A specially crafted untrusted payload can make the parser alternate between array representations, producing quadratic work as the payload grows and causing denial of service in applications that parse untrusted devalue data. This issue is fixed in version 5.9.2.
Additional publisher context
EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.
Original publisher date fields
datePublished: Sep 16, 2026, 6:34:34 PM
dateUpdated: Sep 17, 2026, 7:25:51 PM
- Source published
- Sep 16, 2026, 6:34:34 PM (timezone not stated)
- Source modified
- Sep 17, 2026, 7:25:51 PM (timezone not stated)
- Saved here
- 11 Nov 2026 16:10:14 UTC
- Source terms
- ENISA EUVD · source terms and attribution apply
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EUVD CVSS 3.1 · 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
nvd · CVE-2026-81176
PublishedSvelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. Prior to 5.9.2, devalue.parse does not reject out-of-bounds indices that are greater than or equal to values.length in src/parse.js. A specially crafted untrusted payload can make the parser alternate between array representations, producing quadratic work as the payload grows and causing denial of service in applications that parse untrusted devalue data. This issue is fixed in version 5.9.2.
Additional publisher context
NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.
Source analysis status: Deferred
Weakness classifications: CWE-770
Original publisher date fields
published: 2026-09-16T19:17:43.437
lastModified: 2026-09-30T17:51:56.193
- Source published
- 16 Sep 2026 19:17:43 UTC
- Source modified
- 30 Sep 2026 17:51:56 UTC
- Saved here
- 25 Oct 2026 16:19:10 UTC
- Source terms
- NIST NVD usage terms; underlying source attribution retained
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Source: nvd · NIST NVD usage terms; underlying source attribution retained. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.
CVSS 3.1 · [email protected] · Secondary · 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
osv · GHSA-9rgm-9g3h-6x36
Published### Impact `devalue.parse` prior to version 5.9.2 fails to reject out-of-bounds indices. Specially-crafted payloads can exploit this to cause devalue to alternate between different array representations, resulting in work that is quadratic with payload size. Applications are potentially affected if they call `devalue.parse` with untrusted data. ### Patches The bug is fixed in `[email protected]`.
- Source published
- 17 Sep 2026 20:28:21 UTC
- Source modified
- 17 Sep 2026 20:45:04 UTC
- Saved here
- 24 Oct 2026 13:17:17 UTC
- Source terms
- GitHub Advisory Database · CC-BY-4.0
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CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Publisher rating · MODERATE