Cesnet Libyang vulnerabilities

CVE-2019-19334 [CRITICAL] CWE-121 CVE-2019-19334: In all versions of libyang before 1.0-r5, a stack-based buffer overflow was discovered in the way li In all versions of libyang before 1.0-r5, a stack-based buffer overflow was discovered in the way libyang parses YANG files with a leaf of type "identityref". An application that uses libyang to parse untrusted YANG files may be vulnerable to this flaw, which would allow an attacker to cause a denial of service or possibly gain code execution.

CVE-2019-19333 [CRITICAL] CWE-121 CVE-2019-19333: In all versions of libyang before 1.0-r5, a stack-based buffer overflow was discovered in the way li In all versions of libyang before 1.0-r5, a stack-based buffer overflow was discovered in the way libyang parses YANG files with a leaf of type "bits". An application that uses libyang to parse untrusted YANG files may be vulnerable to this flaw, which would allow an attacker to cause a denial of service or possibly gain code execution.

CVE-2026-44673 [HIGH] CWE-190 CVE-2026-44673: libyang is a YANG data modeling language library. Prior to SO 5.2.15, lyb_read_string() in src/parse libyang is a YANG data modeling language library. Prior to SO 5.2.15, lyb_read_string() in src/parser_lyb.c contains an integer overflow that results in a heap buffer overflow when parsing a maliciously crafted LYB binary blob. An attacker who can supply LYB data to any libyang consumer (NETCONF server, sysrepo, etc.) can trigger a crash or potential

CVE-2019-20394 [HIGH] CWE-415 CVE-2019-20394: A double-free is present in libyang before v1.0-r3 in the function yyparse() when a type statement i A double-free is present in libyang before v1.0-r3 in the function yyparse() when a type statement in used in a notification statement. Applications that use libyang to parse untrusted input yang files may be vulnerable to this flaw, which would cause a crash or potentially code execution.

CVE-2019-20393 [HIGH] CWE-415 CVE-2019-20393: A double-free is present in libyang before v1.0-r1 in the function yyparse() when an empty descripti A double-free is present in libyang before v1.0-r1 in the function yyparse() when an empty description is used. Applications that use libyang to parse untrusted input yang files may be vulnerable to this flaw, which would cause a crash or potentially code execution.

CVE-2019-20397 [HIGH] CWE-415 CVE-2019-20397: A double-free is present in libyang before v1.0-r1 in the function yyparse() when an organization fi A double-free is present in libyang before v1.0-r1 in the function yyparse() when an organization field is not terminated. Applications that use libyang to parse untrusted input yang files may be vulnerable to this flaw, which would cause a crash or potentially code execution.

CVE-2021-28903 [HIGH] CWE-674 CVE-2021-28903: A stack overflow in libyang <= v1.0.225 can cause a denial of service through function lyxml_parse_m A stack overflow in libyang <= v1.0.225 can cause a denial of service through function lyxml_parse_mem(). lyxml_parse_elem() function will be called recursively, which will consume stack space and lead to crash.

CVE-2021-28906 [HIGH] CWE-252 CVE-2021-28906: In function read_yin_leaf() in libyang <= v1.0.225, it doesn't check whether the value of retval->ex In function read_yin_leaf() in libyang ext[r] is NULL. In some cases, it can be NULL, which leads to the operation of retval->ext[r]->flags that results in a crash.

CVE-2021-28902 [HIGH] CWE-252 CVE-2021-28902: In function read_yin_container() in libyang <= v1.0.225, it doesn't check whether the value of retva In function read_yin_container() in libyang ext[r] is NULL. In some cases, it can be NULL, which leads to the operation of retval->ext[r]->flags that results in a crash.

CVE-2023-26917 [HIGH] CWE-476 CVE-2023-26917: libyang from v2.0.164 to v2.1.30 was discovered to contain a NULL pointer dereference via the functi libyang from v2.0.164 to v2.1.30 was discovered to contain a NULL pointer dereference via the function lysp_stmt_validate_value at lys_parse_mem.c.

CVE-2021-28904 [HIGH] CWE-252 CVE-2021-28904: In function ext_get_plugin() in libyang <= v1.0.225, it doesn't check whether the value of revision In function ext_get_plugin() in libyang <= v1.0.225, it doesn't check whether the value of revision is NULL. If revision is NULL, the operation of strcmp(revision, ext_plugins[u].revision) will lead to a crash.

CVE-2021-28905 [HIGH] CWE-617 CVE-2021-28905: In function lys_node_free() in libyang <= v1.0.225, it asserts that the value of node->module can't In function lys_node_free() in libyang module can't be NULL. But in some cases, node->module can be null, which triggers a reachable assertion (CWE-617).

CVE-2019-20392 [MEDIUM] CWE-119 CVE-2019-20392: An invalid memory access flaw is present in libyang before v1.0-r1 in the function resolve_feature_v An invalid memory access flaw is present in libyang before v1.0-r1 in the function resolve_feature_value() when an if-feature statement is used inside a list key node, and the feature used is not defined. Applications that use libyang to parse untrusted input yang files may crash.

CVE-2019-20391 [MEDIUM] CWE-119 CVE-2019-20391: An invalid memory access flaw is present in libyang before v1.0-r3 in the function resolve_feature_v An invalid memory access flaw is present in libyang before v1.0-r3 in the function resolve_feature_value() when an if-feature statement is used inside a bit. Applications that use libyang to parse untrusted input yang files may crash.

CVE-2019-20395 [MEDIUM] CWE-674 CVE-2019-20395: A stack consumption issue is present in libyang before v1.0-r1 due to the self-referential union typ A stack consumption issue is present in libyang before v1.0-r1 due to the self-referential union type containing leafrefs. Applications that use libyang to parse untrusted input yang files may crash.

CVE-2019-20398 [MEDIUM] CWE-476 CVE-2019-20398: A NULL pointer dereference is present in libyang before v1.0-r3 in the function lys_extension_instan 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.

CVE-2019-20396 [MEDIUM] CWE-119 CVE-2019-20396: A segmentation fault is present in yyparse in libyang before v1.0-r1 due to a malformed pattern stat A segmentation fault is present in yyparse in libyang before v1.0-r1 due to a malformed pattern statement value during lys_parse_path parsing.

CVE-2023-26916 [MEDIUM] CWE-476 CVE-2023-26916: libyang from v2.0.164 to v2.1.30 was discovered to contain a NULL pointer dereference via the functi libyang from v2.0.164 to v2.1.30 was discovered to contain a NULL pointer dereference via the function lys_parse_mem at lys_parse_mem.c.