Is there a public exploit for CVE-2026-44291?

No public exploit for CVE-2026-44291 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-44291?

CVE-2026-44291 scores CVSS 8.1 (v3.1), rated high. EPSS puts the chance of exploitation in the next 30 days at 0.5%.

What does CVE-2026-44291 affect?

CVE-2026-44291 affects protobufjs protobuf.js.

8.1 High

protobufjs compiles protobuf definitions into JavaScript (JS) functions.

CVE-2026-44291

protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs used plain objects with inherited prototypes for internal type lookup tables used by generated encode and decode functions. If Object.prototype had already been polluted, those lookup tables could resolve attacker-controlled inherited properties as valid protobuf type information. This could cause attacker-controlled strings to be emitted into generated JavaScript code. This vulnerability is fixed in 7.5.6 and 8.0.2.

Assessment

CVSS: 8.1 (v3.1)
Severity: High
EPSS: 0.5% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 13 May 2026
Last updated: 17 June 2026
Affected: protobufjs · protobuf.js
Weakness: CWE-94
Assigner: security-advisories@github.com

CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

At the source

References

https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-75px-5xx7-5xc7

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