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CVE-2026-44293

36
FAUCET Score

protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs generated JavaScript for toObject conversion could include an unsafe expression derived from a schema-controlled bytes field default value. A crafted descriptor with a non-string default value for a bytes field could cause attacker-controlled code to be emitted into the generated conversion function. This vulnerability is fixed in 7.5.6 and 8.0.2.

First published: May 13, 2026Last modified: May 13, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 7.5.6CPE matchmatch criteria
cpe:2.3:a:protobufjs_project:protobufjs:*:*:*:*:*:node.js:*:*
>= 8.0.0, < 8.0.2CPE matchmatch criteria
cpe:2.3:a:protobufjs_project:protobufjs:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 4.0

7.7HIGH

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/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

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
LOW
User Interaction
NONE
VS Confidentiality
HIGH
VS Integrity
HIGH
VS Availability
HIGH
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.39%
Probability of exploitation in next 30 days
EPSS Percentile
31.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0039 is in the 20th percentile among its peer group of 17,823 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

npmpatch availablevia ghsa
Product: protobufjsFixed in: 7.5.6
npmpatch availablevia ghsa
Product: protobufjsFixed in: 8.0.2
github_advisoryworkaround availablevia nvd_reference
View patch

Vendor Advisories (1)

npmGHSA-66ff-xgx4-vchmhigh

protobuf.js: Code injection through bytes field defaults in generated toObject code

May 12, 2026

References

access.redhat.com / errata/RHSA-2026:26090
access.redhat.com / errata/RHSA-2026:26234
access.redhat.com / errata/RHSA-2026:29795
access.redhat.com / errata/RHSA-2026:34160
access.redhat.com / errata/RHSA-2026:34374
access.redhat.com / errata/RHSA-2026:37186
access.redhat.com / errata/RHSA-2026:37385
access.redhat.com / errata/RHSA-2026:37628
access.redhat.com / security/cve/CVE-2026-44293
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-44293.json
github.com / protobufjs/protobuf.js/security/advisories/GHSA-66ff-xgx4-vchm
MitigationVendor Advisory