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Devalue before 5.9.3 Quadratic Expansion Denial of Service via uneval

CVSS 4.0 8.7 HIGHCVSS 3.1 7.5 HIGHEUVD CVSS 4.0 8.7 CVSS 4.0 · [email protected] · Secondary 8.7 HIGHCVSS 3.1 · [email protected] · Secondary 7.5 HIGHCVSS_V4 Publisher rating HIGHFixed by devalue 5.9.3KEV status unknown

cve-program · CVE-2026-123565

Published

Sveltejs devalue before 5.9.3 contains a resource exhaustion vulnerability where repeated primitive strings cause quadratic expansion in the uneval function. Attackers can supply a small crafted payload that is parsed and then passed to uneval, producing a very large serialized string that exhausts memory or CPU.

Read the publisher's advisory

euvd · EUVD-2026-119450

Published

Sveltejs devalue before 5.9.3 contains a resource exhaustion vulnerability where repeated primitive strings cause quadratic expansion in the uneval function. Attackers can supply a small crafted payload that is parsed and then passed to uneval, producing a very large serialized string that exhausts memory or CPU.

Read the publisher's advisory

nvd · CVE-2026-123565

Published

Sveltejs devalue before 5.9.3 contains a resource exhaustion vulnerability where repeated primitive strings cause quadratic expansion in the uneval function. Attackers can supply a small crafted payload that is parsed and then passed to uneval, producing a very large serialized string that exhausts memory or CPU.

Read the publisher's advisory

osv · GHSA-mcm9-63f2-9j32

Published

Under very constrained circumstances, data that was `parse`d and then passed to `uneval` could turn a small payload into a very large serialized string.

Read the publisher's advisory

Affected versions, risk and source history

Exploitation and risk

Source status

CISA KEV lists vulnerabilities known to be exploited. FIRST EPSS estimates the likelihood of exploitation in the next 30 days. An unavailable score does not mean zero risk.

Which CVEs have scores here?

This view includes predictions for CVE identifiers explicitly listed in public NuGet advisories. Microsoft release pages have their own prediction coverage. Check source status for the scope and latest checks.

No exploitation or prediction data is available here for these CVEs. This does not mean they are safe or unlikely to be exploited.

Risk history

Compare earlier KEV listings and EPSS scores. Advisory wording and affected versions have a separate history.

When does an EPSS score appear as a change?

A prediction change is reported when EPSS rises from below 10% to 10% or higher. Every daily score change from the last 30 days stays in this history. Before that, it keeps KEV changes and moves between EPSS bands (0.1%, 1%, 5%, 10%, 20%, 50% and 90%).

Advisory history

11 saved versions

See how the publisher's advisory changed over time. Each link opens the version saved at that time. The publisher's update date can differ from the date shown here.

How advisory history works

Each link identifies one complete publisher record. History can include advisories that previously shared an identifier; an identifier removed by a publisher no longer establishes a current relationship. A historical link shows only that record and earlier saved versions. Failed checks and unchanged reads do not create new versions.

14 Nov 2026 12:57:57 UTC

Sveltejs devalue before 5.9.3 contains a resource exhaustion vulnerability where repeated primitive strings cause quadratic expansion in the uneval function. Attackers can supply a small crafted payload that is parsed and then passed to une…

nvd · CVE-2026-123565 · Published

14 Nov 2026 11:58:31 UTC

Sveltejs devalue before 5.9.3 contains a resource exhaustion vulnerability where repeated primitive strings cause quadratic expansion in the uneval function. Attackers can supply a small crafted payload that is parsed and then passed to une…

euvd · EUVD-2026-119450 · Published

12 Nov 2026 12:55:43 UTC

Sveltejs devalue before 5.9.3 contains a resource exhaustion vulnerability where repeated primitive strings cause quadratic expansion in the uneval function. Attackers can supply a small crafted payload that is parsed and then passed to une…

nvd · CVE-2026-123565 · Published

12 Nov 2026 11:56:01 UTC

Sveltejs devalue before 5.9.3 contains a resource exhaustion vulnerability where repeated primitive strings cause quadratic expansion in the uneval function. Attackers can supply a small crafted payload that is parsed and then passed to une…

euvd · EUVD-2026-119450 · Published

10 Nov 2026 19:21:22 UTC

Devalue before 5.9.3 Quadratic Expansion Denial of Service via uneval

cve-program · CVE-2026-123565 · Published

10 Nov 2026 11:25:42 UTC

Sveltejs devalue before 5.9.3 contains a resource exhaustion vulnerability where repeated primitive strings cause quadratic expansion in the uneval function. Attackers can supply a small crafted payload that is parsed and then passed to une…

euvd · EUVD-2026-119450 · Published

8 Nov 2026 11:07:45 UTC

Sveltejs devalue before 5.9.3 contains a resource exhaustion vulnerability where repeated primitive strings cause quadratic expansion in the uneval function. Attackers can supply a small crafted payload that is parsed and then passed to une…

euvd · EUVD-2026-119450 · Published

8 Nov 2026 11:07:14 UTC

Sveltejs devalue before 5.9.3 contains a resource exhaustion vulnerability where repeated primitive strings cause quadratic expansion in the uneval function. Attackers can supply a small crafted payload that is parsed and then passed to une…

nvd · CVE-2026-123565 · Published

8 Nov 2026 11:04:43 UTC

devalue: Repeated primitive strings cause quadratic expansion in uneval

osv · GHSA-mcm9-63f2-9j32 · Published

8 Nov 2026 03:06:35 UTC

Devalue before 5.9.3 Quadratic Expansion Denial of Service via uneval

cve-program · CVE-2026-123565 · Published

24 Oct 2026 13:17:17 UTC

devalue: Repeated primitive strings cause quadratic expansion in uneval

osv · GHSA-mcm9-63f2-9j32 · Published

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 15 Nov 23:13 UTC · 274 of 275 readable · 250 fully read · 18 waiting for GitHub's hourly limit · documentation 461/469 current