CVE-2026-2681 A flaw was found in the blst cryptographic library.
A remote attacker can cause a denial of service in applications using the blst library by triggering an out-of-bounds stack write during key generation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-2681?
CVE-2026-2681 is a medium-severity memory corruption vulnerability, published on 19 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-787
Which versions are affected by CVE-2026-2681?
How do I fix CVE-2026-2681?
No fix has been published for CVE-2026-2681 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-2681 being exploited?
There is no known exploitation of CVE-2026-2681 in the wild and no public exploit code.
Sources
Also known as GHSA-6ff8-r7x3-m73p.