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Description

A flaw was found in the blst cryptographic library. This out-of-bounds stack write vulnerability, specifically in the blst_sha256_bcopy assembly routine, occurs due to a missing zero-length guard. A remote attacker can exploit this by providing a zero-length salt parameter to key generation functions, such as blst_keygen_v5(), if the application exposes this functionality. Successful exploitation leads to memory corruption and immediate process termination, resulting in a denial-of-service (DoS) condition.

PUBLISHED Reserved 2026-02-18 | Published 2026-02-19 | Updated 2026-02-19 | Assigner fedora




MEDIUM: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Problem types

Out-of-bounds Write

Product status

Default status
unaffected

Any version
affected

Timeline

2026-02-18:Reported to Red Hat.
2026-02-18:Made public.

Credits

Red Hat would like to thank Kr0emer for reporting this issue.

References

access.redhat.com/security/cve/CVE-2026-2681 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2440580 (RHBZ#2440580) issue-tracking

cve.org (CVE-2026-2681)

nvd.nist.gov (CVE-2026-2681)

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