What’s Vulnerable › Vulnerabilities

CVE-2026-2681: Github.com/supranational/blst: blst cryptographic library: denial of service via out-of-bounds stack write in key generation

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-19 · updated 2026-06-17
• Weakness: CWE-787

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.

References

• https://access.redhat.com/security/cve/CVE-2026-2681
• https://bugzilla.redhat.com/show_bug.cgi?id=2440580

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