CVE-2026-2681
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BaseFortify

Publication date: 2026-02-19

Last updated on: 2026-02-19

Assigner: Fedora Project

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.
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Meta Information
Published
2026-02-19
Last Modified
2026-02-19
Generated
2026-06-16
AI Q&A
2026-02-19
EPSS Evaluated
2026-06-15
NVD
CVE-2026-2681
EUVD
EUVD-2026-7995
Affected Vendors & Products
Currently, no data is known.
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-787 The product writes data past the end, or before the beginning, of the intended buffer.
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Executive Summary

This vulnerability is a flaw in the blst cryptographic library involving an out-of-bounds stack write in the blst_sha256_bcopy assembly routine. It happens because there is no guard against a zero-length salt parameter when key generation functions like blst_keygen_v5() are called. If an attacker remotely provides a zero-length salt, it can cause memory corruption.

The result of this flaw is that the process using the library can terminate immediately due to this memory corruption, causing a denial-of-service (DoS) condition.

Impact Analysis

The primary impact of this vulnerability is that an attacker can cause the affected application to crash by exploiting the out-of-bounds stack write. This leads to immediate process termination and results in a denial-of-service (DoS) condition.

There is no indication that confidentiality or integrity of data is affected, but availability is impacted due to the forced termination of the process.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

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