A NULL pointer dereference is present in libyang before v1.0-r3 in the function lys_extension_instances_free() due to a copy of unresolved extensions in lys_restr_dup(). Applications that use libyang to parse untrusted input yang files may crash.
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Libyang | Cesnet | 0.11-r1 (including) | 0.11-r1 (including) |
| Libyang | Cesnet | 0.11-r2 (including) | 0.11-r2 (including) |
| Libyang | Cesnet | 0.12-r1 (including) | 0.12-r1 (including) |
| Libyang | Cesnet | 0.12-r2 (including) | 0.12-r2 (including) |
| Libyang | Cesnet | 0.13-r1 (including) | 0.13-r1 (including) |
| Libyang | Cesnet | 0.13-r2 (including) | 0.13-r2 (including) |
| Libyang | Cesnet | 0.14-r1 (including) | 0.14-r1 (including) |
| Libyang | Cesnet | 0.15-r1 (including) | 0.15-r1 (including) |
| Libyang | Cesnet | 0.16-r1 (including) | 0.16-r1 (including) |
| Libyang | Cesnet | 0.16-r2 (including) | 0.16-r2 (including) |
| Libyang | Cesnet | 0.16-r3 (including) | 0.16-r3 (including) |
| Libyang | Cesnet | 1.0-r1 (including) | 1.0-r1 (including) |
| Libyang | Cesnet | 1.0-r2 (including) | 1.0-r2 (including) |
| Libyang | Ubuntu | eoan | * |
| Libyang | Ubuntu | esm-apps/focal | * |
| Libyang | Ubuntu | focal | * |
| Libyang | Ubuntu | groovy | * |
| Libyang | Ubuntu | hirsute | * |
| Libyang | Ubuntu | trusty | * |
| Libyang | Ubuntu | upstream | * |
| Red Hat Enterprise Linux 8 | RedHat | libyang-0:1.0.184-1.el8 | * |