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No exploitation reportedFix available

CVE-2026-40200

No exploitation reported by the sources we read.

  • Published2026-04-10
  • WeaknessCWE-670

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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).

Timeline

dates in UTC
  1. 2026-04-1017:17CVE publishedNVD

Versions per branch

Products declared by the CNA1 product

As mitre, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • musl-libc muslother versions: unknown
    Affected
    • ≥ 0.7.10, ≤ 1.2.6no fix statedsemver

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-04-10

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • muslUbuntu:Pro:20.04:LTSall versions · no fixed version listed
  • muslUbuntu:Pro:18.04:LTSall versions · no fixed version listed
  • muslUbuntu:Pro:16.04:LTSall versions · no fixed version listed
  • muslUbuntu:Pro:14.04:LTSall versions · no fixed version listed
  • muslUbuntu:26.10all versions · no fixed version listed
  • muslUbuntu:26.04:LTSall versions · no fixed version listed
  • muslUbuntu:25.10all versions · no fixed version listed
  • muslUbuntu:24.04:LTSall versions · no fixed version listed

35 more package ranges on OSV.dev

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionnone2026-04-14
  • CNACVSS 3.18.1known since 2026-10-23
  • CNAweakness (CWE)CWE-670known since 2026-10-23
  • FIRST EPSSEPSS score0.2 %2026-11-05
  • OSVaffected packages—

Identifiers

  • EUVD-2026-21496same flawENISA EUVD · LicenseRef-ENISA-legal-notice
  • OESA-2026-1927advisory covering several CVEsopenEuler · LicenseRef-unstated
  • OESA-2026-1928advisory covering several CVEsopenEuler · LicenseRef-unstated
  • OESA-2026-2087advisory covering several CVEsopenEuler · LicenseRef-unstated
  • OESA-2026-2088advisory covering several CVEsopenEuler · LicenseRef-unstated
  • OESA-2026-2178advisory covering several CVEsopenEuler · LicenseRef-unstated

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Published
2026-04-10
Last Modified
2026-06-17
NVD status
Deferred

Frequently asked questions

What is CVE-2026-40200?

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).

Is CVE-2026-40200 actively exploited?

Active exploitation of CVE-2026-40200 has not been confirmed. Its EPSS score was 0.2% on 2026-11-05, the estimated probability of exploitation in the next 30 days.

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

CVE-2026-40200 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.

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