{"id":"CVE-2026-33666","summary":"Zserio: Integer Overflow in BitStreamReader on 32-bit platforms","details":"Zserio is a framework for serializing structured data with a compact and efficient way with low overhead. Prior to 2.18.1, in BitStreamReader.h readBytes() / readString(), the setBitPosition() bounds check receives the overflowed value and is completely bypassed. The code then reads len bytes (512 MB) from a buffer that is only a few bytes long, causing a segmentation fault. This vulnerability is fixed in 2.18.1.","aliases":["GHSA-fjwv-6wcr-vqwj"],"modified":"2026-07-08T08:12:50.010911905Z","published":"2026-04-24T18:21:11.265Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33666.json","cwe_ids":["CWE-190"],"cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33666.json"},{"type":"ADVISORY","url":"https://github.com/ndsev/zserio/security/advisories/GHSA-fjwv-6wcr-vqwj"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33666"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/ndsev/zserio","events":[{"introduced":"0"},{"fixed":"c82ea940ec2daae371328bcd9eedd07953b9a7e3"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"2.15.0"},{"fixed":"2.18.1"}],"source":["AFFECTED_FIELD","CPE_RANGE"],"cpe":"cpe:2.3:a:nds-association:zserio:*:*:*:*:*:*:*:*"}}],"versions":["v2.18.0","v2.17.0","v2.16.1","v2.16.0","v2.15.0","v2.14.1","v2.14.0","v2.13.0","v2.12.0","v2.11.0","v2.10.0","v2.9.0","v2.9.0-pre1","v2.8.0","v2.7.0","v2.6.1","v2.6.0","v2.5.1","v2.5.0","v2.5.0-pre1","v2.4.2","v2.4.1","v2.4.0","v2.4.0-pre3","v2.4.0-pre2","v2.4.0-pre1","v2.3.0","v2.3.0-pre1","v2.2.0","v2.1.0","v2.1.0-pre3","v2.1.0-pre2","v2.1.0-pre1","v2.0.0","v2.0.0-pre5","v2.0.0-pre4","v2.0.0-pre3","v2.0.0-pre2","v2.0.0-pre1","v1.4.0-pre2","v1.4.0-pre1","v1.3.0","v1.2.0","v1.2.0-pre1","v1.1.0","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33666.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}