Critical libyang Vulnerability in Ubuntu Leads to Denial of Service Risk

Linuxsecurity

Critical libyang Vulnerability in Ubuntu Leads to Denial of Service Risk

First seen 30 Jun 2026, 16:39 UTC • •70.5

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ThreatCluster •July 1, 2026 at 16:37 UTC

•libyang vulnerability could lead to denial of service or arbitrary code execution.
•Affected systems include Ubuntu 26.04 LTS and 25.10 with specific libyang versions.
•Users are urged to update their systems to mitigate the risk.

A critical vulnerability has been identified in libyang, a parser toolkit for IETF YANG data modeling, affecting Ubuntu 26.04 LTS and 25.10. The flaw arises from improper handling of metadata list pointers, which could allow an attacker to crash the service or potentially execute arbitrary code. This vulnerability poses a significant denial of service threat if exploited via specially crafted network traffic. Users are advised to update their systems to the latest package versions to mitigate the risk. The affected versions include libyang3 3.13.6-1ubuntu0.1 for Ubuntu 26.04 and libyang3 3.13.5-2ubuntu0.1 for Ubuntu 25.10. A standard system update is recommended to apply the necessary changes. The vulnerability has been documented in Ubuntu Security Notice USN-8485-1.

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Timeline

2026-06-30

libyang vulnerability discovered

A flaw in libyang's handling of metadata list pointers was identified, leading to potential crashes or arbitrary code execution.

2026-06-30

Ubuntu Security Notice USN-8485-1 issued

Ubuntu released a security notice detailing the libyang vulnerability and recommended updates for affected versions.

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Threat Graph

6 entities, 7 inferred relationships (STIX 2.1).

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Technique (3)

DDoS
Denial of Service
T1203 - Exploitation for Client Execution

Organization (1)

Ubuntu

Affected Platform (2)

Libyang
Linux

Relationships

DDoS targets Libyang
DDoS targets Linux
Denial of Service targets Libyang
Denial of Service targets Linux
T1203 - Exploitation for Client Execution targets Libyang
T1203 - Exploitation for Client Execution targets Linux
DDoS related to Ubuntu

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