{"cve":"CVE-2026-44288","nvd":{"published":"2026-05-13T16:16:55.587","modified":"2026-06-17T10:50:26.910","status":"Analyzed","description":"protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs includes a minimal UTF-8 decoder that accepted overlong UTF-8 byte sequences and decoded them to their canonical characters instead of replacing them. An attacker who can provide protobuf binary data decoded through the affected UTF-8 path may be able to bypass application-level checks that inspect raw bytes before protobuf string decoding. For example, bytes that do not contain certain ASCII characters could decode to strings containing those characters. This vulnerability is fixed in 7.5.6 and 8.0.2.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3},"cwes":["CWE-176"],"references":["https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-q6x5-8v7m-xcrf"],"products":["protobufjs_project:protobufjs"],"source":"nvd","synced_at":"2026-10-19T22:35:16.954578616+00:00"},"epss":{"cve":"CVE-2026-44288","score":0.00301,"percentile":0.22835,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-q6x5-8v7m-xcrf","url":"https://osv.dev/vulnerability/GHSA-q6x5-8v7m-xcrf","summary":"protobufjs has overlong UTF-8 decoding","modified":"2026-09-10T03:50:55.284110621Z","packages":[{"ecosystem":"npm","name":"protobufjs","purl":"pkg:npm/protobufjs","ranges":["<7.5.6"],"fixed":["7.5.6"]},{"ecosystem":"npm","name":"protobufjs","purl":"pkg:npm/protobufjs","ranges":[">=8.0.0 <8.0.2"],"fixed":["8.0.2"]},{"ecosystem":"npm","name":"@protobufjs/utf8","purl":"pkg:npm/%40protobufjs/utf8","ranges":["<1.1.1"],"fixed":["1.1.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}