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Public proof of conceptFix available

CVE-2026-41242

A public proof of concept exists; no exploitation attested.

  • Published2026-04-18
  • Fixed in7.5.5
  • WeaknessCWE-94

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-04-1817:16CVE publishedNVD
  2. 2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-41242?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-41242?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Protobufjs project protobufjs
BranchAffectedFixed in
7.5< 7.5.57.5.5
8.0= 8.0.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • RHSA-2026:62260 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat OpenShift Dev Spaces 3.30.0 Release.

  • RHSA-2026:37275 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: RHOAI 3.3.5 - Red Hat OpenShift AI

  • RHSA-2026:24977 Red Hat Product Security8 products fixed

    Red Hat Security Advisory: RHOAI 2.25.7 - Red Hat OpenShift AI

  • RHSA-2026:21338 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Developer Hub 1.8.7 release.

Full record on NVD

Fix

  1. Update Protobufjs project protobufjs to 7.5.5
  2. Vendor fix Red Hat Product Security RHSA-2026:62260 · 4 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  3. Vendor fix Red Hat Product Security RHSA-2026:37275 · 4 productsFor Red Hat OpenShift AI 3.3.5 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
  4. Vendor fix Red Hat Product Security RHSA-2026:24977 · 8 productsFor Red Hat OpenShift AI 2.25.7 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
  5. Vendor fix Red Hat Product Security RHSA-2026:21338 · 1 productFor more about Red Hat Developer Hub, see References links
  6. Workaround from the vendor Red Hat Product Security RHSA-2026:62260 · 65 productsMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Advisories and patches

Detection

read 2026-10-23 19:25 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
2 repositories, unverified4chech/CVE-2026-41242Giangdurian/CVE-2026-41242
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionpoc2026-04-20
  • OpenCVESSVC decisionpoc—
  • CNACVSS 4.09.4read 2026-10-23
  • CNACVSS 3.18.8read 2026-10-23
  • NVDCVSS 3.19.8read 2026-10-23
  • CNAweakness (CWE)CWE-94read 2026-10-23
  • FIRST EPSSEPSS score1.0 %2026-10-22
  • PoC-in-GitHubproof of concept2read 2026-10-23

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 4.0 vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-04-18
Last Modified
2026-09-09
NVD status
Modified

Frequently asked questions

What is CVE-2026-41242?

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.

Is CVE-2026-41242 actively exploited?

A proof-of-concept exploit exists for CVE-2026-41242, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-41242?

CVE-2026-41242 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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