CVE-2026-59877
🔶 mediumSummary
protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.6.5 and 8.6.6, protobufjs parsed option names by advancing through schema tokens until reaching an = token without checking for end of input, so a crafted .proto schema that opens an option declaration and ends prematurely can cause parse, Root.load, or Root.loadSync to loop indefinitely. This issue is fixed in versions 7.6.5 and 8.6.6.
CVSS Score
5.3
Medium
EPSS Score
0.4
Exploit Probability
Published Date
2026-07-08
First Seen: 2026-07-09
📊 Relative Risk Intelligence
This CVE is Lower Risk - more severe than 19.0% of all 365,968 vulnerabilities in our database.
#296,586
Below average severity
Severity Percentile
🎯 CISA SSVC Assessment Updated: Jul 8, 2026
🔍 Exploitation Status
None
No known exploits
⚙️ Automatable
YES
Can be exploited automatically
💥 Technical Impact
Partial
Limited system impact
SSVC data provided by
CISA
Last Modified
2026-07-10
Source
NVD 🔗
CVSS Vector 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE IDs (Weakness Types)