CVSS 3.1
5.3 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NCVE-2026-44288
Medium (5.3) in protobufjs project protobufjs. EPSS 0.3% chance of exploitation in the next 30 days. Fixed in protobufjs 7.5.6, 8.0.2.
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.
Severity
- EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 22% of CVEs (scores of 2026-10-31)
- CWE
- CWE-176
- Published
- Modified
- Record from
- the NVD, synced
Affected
- protobufjs_project:protobufjs
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-q6x5-8v7m-xcrf | npm | protobufjs | <7.5.6 | 7.5.6 |
| GHSA-q6x5-8v7m-xcrf | npm | protobufjs | >=8.0.0 <8.0.2 | 8.0.2 |
| GHSA-q6x5-8v7m-xcrf | npm | @protobufjs/utf8 | <1.1.1 | 1.1.1 |