NULL pointer dereference in libyang - CVE-2023-26917
Published: September 18, 2025
Vulnerability identifier: #VU115763
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2023-26917
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error within the lysp_stmt_validate_value() function in lys_parse_mem.c. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.
Affected software
libyang
Ubuntu
libyang2 (Ubuntu package)
Ubuntu
libyang2 (Ubuntu package)
How to mitigate CVE-2023-26917
Install update from vendor's website.
libyang - update to 2.1.55
libyang2 (Ubuntu package) - update to 2.1.30-2.1ubuntu0.1
libyang2 (Ubuntu package) - update to 2.1.30-2.1ubuntu0.1