What is the CVSS score of CVE-2026-2681?

CVE-2026-2681 has a CVSS 3.1 base score of 5.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L. EPSS exploitation probability: 0.1%.

Which versions of Red Hat are affected by CVE-2026-2681?

Organizations using A flaw should be aware of moderate risk from CVE-2026-2681, a out-of-bounds write vulnerability rated CVSS 5.3. Exploitation could cause memory corruption or application crashes.

How to fix or mitigate CVE-2026-2681?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Red Hat CVE-2026-2681

MEDIUM

Out-of-bounds Write (CWE-787)

2026-02-19 patrick@puiterwijk.org

Memory Corruption Red Hat

5.3

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.3 MEDIUM

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

Red Hat

5.3 MEDIUM

qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:03 vuln.today

CVE Published

Feb 19, 2026 - 07:17 nvd

MEDIUM 5.3

DescriptionCVE.org

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.

AnalysisAI

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. No patch is currently available for this vulnerability.

Technical ContextAI

Classified as CWE-787 (Out-of-bounds Write). 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)

Affected ProductsAI

the blst cryptographic library

RemediationAI

Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible. Restrict network access to the affected service where possible.