Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2026-41242
protobufjs has an arbitrary code execution issue
AV AC AT PR UI VC VI VA CVSS EPSS %ile KEV
N L N L N H H H 9.4 .0099 61.2 —
AFFECTED
Product Versions Fixed
protobuf.js < 7.5.5 – —
TIMELINE
Apr 18 Reserved by GitHub_M
Apr 18 Published (CNA: GitHub_M)
Aug 26 EXPLOIT PUBLISHED — CVE-2026-41242 (protobufjs protobuf.js). Public exploit reference added.
Sep 2 EXPLOIT PUBLISHED — CVE-2026-41242 (protobufjs protobuf.js). Public exploit reference added.
Sep 7 EXPLOIT PUBLISHED — CVE-2026-41242 (protobufjs protobuf.js). Public exploit reference added.
Sep 9 EXPLOIT PUBLISHED — CVE-2026-41242 (protobufjs protobuf.js). Public exploit reference added.
Description
protobufjs compiles protobuf definitions into JavaScript (JS) functions. In versions prior to 8.0.1 and 7.5.5, attackers can inject arbitrary code in the "type" fields of protobuf definitions, which will then execute during object decoding using that definition. Versions 8.0.1 and 7.5.5 patch the issue.
Lifecycle
Complete event history — 6 events, chronological
| Date | Event | Detail |
|---|
| April 18, 2026 | Reserved | Reserved by GitHub_M |
| April 18, 2026 | Published | Published (CNA: GitHub_M) |
| August 26, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-41242 (protobufjs protobuf.js). Public exploit reference added. |
| September 2, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-41242 (protobufjs protobuf.js). Public exploit reference added. |
| September 7, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-41242 (protobufjs protobuf.js). Public exploit reference added. |
| September 9, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-41242 (protobufjs protobuf.js). Public exploit reference added. |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| protobufjs | protobuf.js | — | < 7.5.5 | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-41242 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
