SB2026070137 - Multiple vulnerabilities in libyang

Description

This security bulletin contains information about 2 vulnerabilities.

1) Use-after-free (CVE-ID: N/A)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in the "lyd_validate_unres", "lyd_validate_unres_when" and "lyd_validate_autodel_node_del" functions. A remote attacker can execute arbitrary code on the target system.

2) Stack-based buffer overflow (CVE-ID: N/A)

CWE-ID: CWE-121 - Stack-based buffer overflow

CVSSv4: 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/E:P/U:Green

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error in lysc_update_path. A remote attacker can trigger stack-based buffer overflow and cause a denial of service condition on the target system.

Remediation

Install update from vendor's website.

References

• https://github.com/CESNET/libyang/security/advisories/GHSA-78mc-jpwv-8hhm
• https://github.com/CESNET/libyang/security/advisories/GHSA-hxxc-fch7-62jm