PT-2026-20648 · Blst · Blst

Osidb Bzimport · Published 2026-02-19 · Updated 2026-02-19 · CVE-2026-2681

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions blst (affected versions not specified)

Description A flaw exists in the blst cryptographic library. This out-of-bounds stack write vulnerability is located in the blst sha256 bcopy assembly routine and is caused by a missing zero-length guard. An 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 results in memory corruption and process termination, leading to a denial-of-service (DoS) condition.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

CVE-2026-2681

Affected Products

Blst

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-2681 · Security Note
• https://twitter.com/CVEnew/status/2024501261937369181 · Twitter Post
• https://bugzilla.redhat.com/show_bug.cgi?id=2440580 · Note
• https://t.me/CVEtracker/45091 · Telegram Post
• https://access.redhat.com/security/cve/CVE-2026-2681 · Note