CVE-2026-2681
MEDIUMCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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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.
Analysis
The blst cryptographic library is vulnerable to an out-of-bounds stack write in the blst_sha256_bcopy routine when processing zero-length salt parameters in key generation functions, allowing remote attackers to trigger memory corruption and process crashes. Applications that expose blst_keygen_v5() or similar functions to untrusted input are susceptible to denial-of-service attacks. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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