CVE-2026-120689

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{"bugzilla": {"description": "hdf5: hdf5: Denial of Service via uncontrolled recursion in B-tree processing", "id": "2565367", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2565367"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-835", "details": ["HDF5 through 2.2.0 contains an uncontrolled recursion vulnerability in H5B__iterate_helper() in src/H5B.c. When iterating a version 1 B-tree, the function does not verify that a child node\u2019s level matches the expected level. That check is performed only in H5B__cache_deserialize() when a node is first loaded into the metadata cache. A crafted HDF5 file whose B-tree child pointer refers back to a node already in the cache, such as a node that points to itself, bypasses the check and causes unbounded recursion, leading to stack exhaustion and a crash. This can be triggered by calling H5Gget_info() or H5Gget_num_objs() on a group in the crafted file, which reaches H5B_iterate() through H5G__obj_info() and H5G__stab_count(). An attacker who can get a user or application to open a malicious file can cause a denial of service.", "A flaw was found in HDF5. When traversing internal B-tree data structures, the library fails to properly validate child node relationships if a node is already loaded in the metadata cache. An attacker could exploit this vulnerability by enticing a user or application to open a specially crafted HDF5 file containing self-referencing tree nodes. This triggers unbounded recursion and stack exhaustion, causing the application to crash and resulting in a Denial of Service (DoS)."], "mitigation": {"lang": "en:us", "value": "Avoid parsing HDF5 files received from untrusted or unverified sources. If processing untrusted files is mandatory, isolate the parsing workflow within a sandboxed container restricted by strict resource limits."}, "name": "CVE-2026-120689", "package_state": [{"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Fix deferred", "package_name": "hdf5", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "hdf5", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Fix deferred", "package_name": "hdf5", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}], "public_date": "2026-11-02T19:39:28Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-120689\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-120689\nhttps://github.com/HDFGroup/hdf5/issues/6403"], "statement": "An uncontrolled recursion vulnerability exists within the HDF5 library's H5B__iterate_helper() function during version 1 B-tree traversal. By enticing a user or automated application to parse a specially crafted HDF5 file containing self-referencing child node pointers already loaded into the metadata cache, an attacker can bypass node level verification, causing stack exhaustion and an application crash resulting in a Denial of Service.", "threat_severity": "Moderate"}

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