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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:cesnet:libyang:*:*:*:*:*:*:*:*", "matchCriteriaId": "6CFE711D-6C8F-4F0F-B53E-BB952DC1FF39", "versionEndIncluding": "1.0.225", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In function read_yin_leaf() in libyang <= v1.0.225, it doesn't check whether the value of retval->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."}, {"lang": "es", "value": "En la funci\u00f3n read_yin_leaf() en libyang versiones anteriores a v1.0.225 incluy\u00e9ndola, no comprueba si el valor de retval-)ext [r] es NULL.&#xa0;En algunos casos, puede ser NULL, lo que conlleva a la operaci\u00f3n de retval-)ext[r]-)flags que resulta en un bloqueo"}], "id": "CVE-2021-28906", "lastModified": "2026-06-17T03:47:01.737", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-05-20T19:15:07.747", "references": [{"source": "cve@mitre.org", "tags": ["Exploit", "Issue Tracking", "Patch", "Third Party Advisory"], "url": "https://github.com/CESNET/libyang/issues/1455"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202107-54"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Issue Tracking", "Patch", "Third Party Advisory"], "url": "https://github.com/CESNET/libyang/issues/1455"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202107-54"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-252"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "libyang: NULL pointer dereference in read_yin_leaf()", "id": "1964018", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1964018"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In function read_yin_leaf() in libyang <= v1.0.225, it doesn't check whether the value of retval->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.", "A flaw was found in libyang. Missing checks in several read_yin_* functions lead to NULL pointer dereferences possibly allowing a remote attacker to crash an application that uses libyang with user-controlled YIN formats. The highest threat from this vulnerability is the service availability."], "name": "CVE-2021-28906", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "libyang", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "libyang", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2021-03-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-28906\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-28906"], "threat_severity": "Moderate"}

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