CVE-2026-5758 json
Mafintosh's protocol-buffers-schema is vulnerable to prototype pollution
published 2026-04-15 6 mo ago modified 2026-10-26 13 d ago also GHSA-j452-xhg8-qg39 , EUVD-2026-22993
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 45%
- public exploits
- 0
- none known
Summary
JavaScript is vulnerable to prototype pollution in Mafintosh's protocol-buffers-schema Version 3.6.0, where an attacker may alter the application logic, bypass security checks, cause a DoS or achieve remote code execution.
Patch / fix
- npm protocol-buffers-schema 3.6.1
- Mafintosh Protocol-buffers-schema parser 3.6.1
- github.com/mafintosh/protocol-buffers-schema#70 pull request
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2026-5758 updated cvss 6.5
protocol-buffers-schema: protocol-buffers-schema: Remote code execution via prototype pollution
-
Red Hat Cryostat 4 grafana-infinity-datasource-npm Red Hat Developer Hub 1 rhdh/rhdh-hub-rhel9 Red Hat OpenShift AI (RHOAI) rhoai/odh-mlflow-rhel9 Red Hat Self-service automation portal 2 ansible-automation-platform/automation-portalaffected: workaround, no fix available “Fix deferred”
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 6 mo ago
Exploit prediction
0.53% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L |
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L |
| GitHub | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | protocol-buffers-schema | <3.6.1 |
3.6.1 |
Affected products
- Mafintosh Protocol-buffers-schema parser
Classification
- Weakness
-
- CWE-1321 Improperly Controlled Modification of Object Prototype Attributes
References
-
github.com
/mafintosh/protocol-buffers-schema/pull/70
web
- morielharush.github.io /2026/04/12/cve-2026-5758-protocol-buffers-schema-prototype-pollution/
-
nvd.nist.gov
/vuln/detail/CVE-2026-5758
advisory
-
github.com
/mafintosh/protocol-buffers-schema
package
-
morielharush.github.io
/2026/04/12/cve-2026-5758-protocol-buffers-schema-prototype-pollution
web
Sources
- CVE List CVE-2026-5758
- GitHub Advisory GHSA-j452-xhg8-qg39
- NVD CVE-2026-5758
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.