Is CVE-2026-40200 in the CISA KEV catalog?

No. CVE-2026-40200 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-40200?

CVE-2026-40200 has a CVSS v3 base score of 8.1 (HIGH).

What is the EPSS score for CVE-2026-40200?

CVE-2026-40200 has an EPSS score of 0.13% (3th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-40200?

Upgrade musl on debian 13 to 1.2.5-3.1~deb13u1 or later.

CVE & CISA-KEV Catalog

CVE-2026-40200

HIGH

8.1

CVSS v3

NVD

Description

An issue was discovered in musl libc 0.7.10 through 1.2.6. Stack-based memory corruption can occur during qsort of very large arrays, due to incorrectly implemented double-word primitives. The number of elements must exceed about seven million, i.e., the 32nd Leonardo number on 32-bit platforms (or the 64th Leonardo number on 64-bit platforms, which is not practical).

CWE-670

How to fix

Remediation Available

muslDebian

Fixed in:1.2.5-3.1~deb13u1CVE-2026-40200

Fixed in:1.2.5-3.1CVE-2026-40200

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.13%probability of exploitation in 30 days

3rdpercentile

Low risk: more likely to be exploited than 3% of all known CVEs.

References

Other references3

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-27.