CVE-2026-5758: mafintosh protocol-buffers-schema parser
CVSS: 6.5v3.1MediumAwaiting analysis
AliasesCGA-2hm9-2cjx-78xjCGA-6352-fqp8-6rg4CGA-h262-q8v6-r2fqCGA-jhmm-7jq6-phg5GHSA-j452-xhg8-qg39CGA-3v6j-26qg-pm8cCGA-42hc-xg73-8rjqCGA-69cr-rh2p-jhjmCGA-6jcr-hvhg-46qhCGA-7qqr-5hrr-rqxgCGA-8r2r-wf2x-hpfqCGA-95mr-rv26-qw4fCGA-cq6w-xg28-wcvqCGA-f933-6v2h-w8hcCGA-p7mw-mgrp-cv3rCGA-p7v7-x88c-6pc9CGA-qcqm-jp3h-h7mxCGA-wm27-2m4v-p66pCGA-wvf3-3274-8gcm
Published 15-04-2026Last modified 15-04-2026
Vulnerability summary
CVE-2026-5758 is a medium (CVSS 6.5) vulnerability in mafintosh protocol-buffers-schema parser. EPSS estimates a 0.69% chance of exploitation in the next 30 days, higher than 51.8% of scored vulnerabilities.
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)EPSS score
0.69%
0%100%
Low · +0.15 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 0 · Related 1Timeline
- 15-04-2026PublishedVulnerability first disclosed.
- 15-04-2026Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
5 scores · 5 sources · 1 versionMedium 6.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:LSourcesAll 5 agree
- OSV · WolfiEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
- OSV · NpmEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
- OSV · ChainguardEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
- NVDNIST6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
EPSS trend
Probability
0.69%
Chance of exploitation in the next 30 days
Percentile
52%
Versus all other CVEs
30-day change
+0.15 pp
From 0.53% on 19-09-2026
19-09-202619-10-2026
EPSS score0.69%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Chainguard9 products
- kibana-7All versions (No fix recorded)
- opensearch-dashboards-2-dashboards-maps< 2.19.5-r10
- opensearch-dashboards-2-fips-dashboards-maps< 2.19.5-r10
- opensearch-dashboards-3-dashboards-maps< 3.6.0-r2
- opensearch-dashboards-3-fips-dashboards-maps< 3.6.0-r3
Wolfi2 products
- opensearch-dashboards-3-dashboards-maps< 3.6.0-r2
- tileserver-gl< 5.6.0-r1
Mafintosh1 product
- protocol-buffers-schema parser≥ 3.6.0, < 3.6.1
Npm1 product
- protocol-buffers-schema< 3.6.1
4 vendors · 13 products
