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No exploitation reportedFix available

CVE-2026-54270

No exploitation reported by the sources we read.

  • Published2026-06-22
  • Fixed in8.5.0
  • WeaknessCWE-770

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. From 8.2.0 to 8.4.2, protobufjs preserved unknown wire elements in message.$unknowns and did not provide a decode-time option to discard unknown fields before retaining them. A crafted protobuf payload containing many unknown fields could therefore cause a decoded message to retain substantially more memory than the input size would suggest, even when unknown-field round-tripping is not needed. protobufjs 8.5.0 added the relevant decode-time options, allowing applications that decode untrusted protobuf data to disable unknown-field retention during decode. protobufjs 8.6.2 flips the default so unknown fields are discarded unless explicitly opted into.

Timeline

dates in UTC
  1. 2026-06-2218:16CVE publishedNVD

Versions per branch

NVD · OSV
Protobufjs project protobufjs
BranchAffectedFixed in
8.x≥ 8.2.0, < 8.5.08.5.0

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

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • protobufjs protobuf.js
    Affected
    • = >=8.2.0, < 8.5.0no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-06-22

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.

Packages

  • @rootio/protobufjsRoot:npmall versions · fixed in 8.2.0-root.io.3
  • @rootio/protobufjsRoot:npmall versions · fixed in 8.3.0-root.io.3
  • librechatChainguardall versions · fixed in 0.8.7-r3
  • openclawMinimOSall versions · fixed in 2026.6.9-r0
  • protobufjsRoot:npmall versions · fixed in 8.2.0-aikido.3
  • protobufjsRoot:npmall versions · fixed in 8.3.0-aikido.3
  • renovateCleanStartall versions · fixed in 43.181.2-r1

Vendor advisories

  • CVE-2026-54270 Red Hat Product Security12 known affected

    protobufjs: protobufjs: Denial of Service due to excessive memory consumption

    rhelai3/bootc-cuda-rhel9 as a component of Red Hat Enterprise Linux AI (RHEL AI) 3 · rhelai3/bootc-gaudi-rhel9 as a component of Red Hat Enterprise Linux AI (RHEL AI) 3 · rhelai3/bootc-rocm-rhel9 as a component of Red Hat Enterprise Linux AI (RHEL AI) 3 · +9 more

Full record on NVD

Fix

  1. Update Protobufjs project protobufjs to 8.5.0
  2. Workaround from the vendor Red Hat Product Security CVE-2026-54270 · 12 productsNo specific mitigation required for unaffected runtime paths.
  3. No fix available, says the vendor Red Hat Product Security CVE-2026-54270 · 12 productsFix deferred

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-10-26
  • CISA-ADPSSVC decisionnone2026-06-23
  • CNACVSS 3.15.3known since 2026-10-26
  • CNAweakness (CWE)CWE-770known since 2026-10-26
  • FIRST EPSSEPSS score0.4 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryMODERATE2026-06-15

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Published
2026-06-22
Last Modified
2026-10-25
NVD status
Analyzed
GitHub Advisory
GHSA-94rc-8x27-4472

Frequently asked questions

What is CVE-2026-54270?

protobufjs compiles protobuf definitions into JavaScript (JS) functions. From 8.2.0 to 8.4.2, protobufjs preserved unknown wire elements in message.$unknowns and did not provide a decode-time option to discard unknown fields before retaining them. A crafted protobuf payload containing many unknown fields could therefore cause a decoded message to retain substantially more memory than the input size would suggest, even when unknown-field round-tripping is not needed. protobufjs 8.5.0 added the relevant decode-time options, allowing applications that decode untrusted protobuf data to disable unknown-field retention during decode. protobufjs 8.6.2 flips the default so unknown fields are discarded unless explicitly opted into.

Is CVE-2026-54270 actively exploited?

Active exploitation of CVE-2026-54270 has not been confirmed. Its EPSS score was 0.4% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-54270?

CVE-2026-54270 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

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