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Vulnerability record · CVE-2021-4048 · published 8 December 2021

CVE-2021-4048: Lapack project lapack out-of-bounds read vulnerability

LLapack Project · Lapack

An out-of-bounds read flaw was found in the CLARRV, DLARRV, SLARRV, and ZLARRV functions in lapack through version 3.10.0, as also used in OpenBLAS before version 0.3.18. Specially crafted inputs passed to these functions could cause an application using lapack to crash or possibly disclose portions of its memory.

9.1 CVSS 3.1 Critical EPSS 2.6% · top 15.5% CWE-125 · Out-of-bounds read
9.1CVSS 3.1 base score, v2 6.4
2.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
8Affected product versions listed by NVD
18References
17 Jun 2026Last modified by NVD

Description

An out-of-bounds read flaw was found in the CLARRV, DLARRV, SLARRV, and ZLARRV functions in lapack through version 3.10.0, as also used in OpenBLAS before version 0.3.18. Specially crafted inputs passed to these functions could cause an application using lapack to crash or possibly disclose portions of its memory.

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

Affected products

8 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/JuliaLang/julia/issues/42415 Issue TrackingPatchThird Party Advisory
https://github.com/Reference-LAPACK/lapack/commit/38f3eeee3108b18158409ca2a100e6fe03754781 PatchThird Party Advisory
https://github.com/Reference-LAPACK/lapack/pull/625 Issue TrackingPatchThird Party Advisory
https://github.com/xianyi/OpenBLAS/commit/2be5ee3cca97a597f2ee2118808a2d5eacea050c PatchThird Party Advisory
https://github.com/xianyi/OpenBLAS/commit/337b65133df174796794871b3988cd03426e6d41 PatchThird Party Advisory
https://github.com/xianyi/OpenBLAS/commit/ddb0ff5353637bb5f5ad060c9620e334c143e3d7 PatchThird Party Advisory
https://github.com/xianyi/OpenBLAS/commit/fe497efa0510466fd93578aaf9da1ad8ed4edbe7 PatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6QFEVOCUG2UXMVMFMTU4ONJ
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DROZM4M2QRKSD6FBO4BHSV2
https://github.com/JuliaLang/julia/issues/42415 Issue TrackingPatchThird Party Advisory
https://github.com/Reference-LAPACK/lapack/commit/38f3eeee3108b18158409ca2a100e6fe03754781 PatchThird Party Advisory
https://github.com/Reference-LAPACK/lapack/pull/625 Issue TrackingPatchThird Party Advisory
https://github.com/xianyi/OpenBLAS/commit/2be5ee3cca97a597f2ee2118808a2d5eacea050c PatchThird Party Advisory
https://github.com/xianyi/OpenBLAS/commit/337b65133df174796794871b3988cd03426e6d41 PatchThird Party Advisory
https://github.com/xianyi/OpenBLAS/commit/ddb0ff5353637bb5f5ad060c9620e334c143e3d7 PatchThird Party Advisory
https://github.com/xianyi/OpenBLAS/commit/fe497efa0510466fd93578aaf9da1ad8ed4edbe7 PatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6QFEVOCUG2UXMVMFMTU4ONJ
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DROZM4M2QRKSD6FBO4BHSV2

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Source: NIST National Vulnerability Database (record CVE-2021-4048), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.