EUVD-2026-42306Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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
Attacker-supplied archive reaches the scanner over the network with no auth or interaction (AV:N/AC:L/PR:N/UI:N); impact is a process hang only, so A:H with C:N/I:N and unchanged scope.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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
Lifecycle Timeline
2DescriptionCVE.org
node-tar is a tar archive manipulation library for Node.js. Prior to 7.5.18, tar.replace accepts a checksum-valid tar header with a negative base-256 encoded entry size, causing the archive scanner to make no progress while repeatedly parsing the same header. This issue is fixed in version 7.5.18.
Articles & Coverage 1
AnalysisAI
Denial of service in node-tar prior to 7.5.18 allows remote attackers to hang a Node.js application by feeding it a crafted tar archive: a checksum-valid header carrying a negative base-256 encoded entry size makes the tar.replace scanner advance zero bytes and re-parse the same header forever. No public exploit or active exploitation is identified at time of analysis, but the CVSS 4.0 base score of 8.7 reflects the high, easily-reachable availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target Node.js application call node-tar's tar.replace on archive data an attacker can influence (e.g., an uploaded or fetched tarball); the malicious input is a tar header with a valid checksum but a negative base-256 encoded entry size. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine availability risk but not a top-tier emergency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An application uses tar.replace to update entries in tar archives that users can upload (for example a package-processing or backup service). An attacker uploads a specially crafted tarball containing a header with a valid checksum but a negative base-256 encoded size; when the service scans it, the tar.replace loop spins on that header forever, consuming CPU and hanging the Node.js event loop until the process is killed. … |
| Remediation | Vendor-released patch: node-tar 7.5.18 - upgrade the direct or transitive dependency to 7.5.18 or later (npm install tar@^7.5.18, and run npm audit / update lockfiles to pull the fix into transitive uses). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Audit Node.js applications for tar.replace() function calls on untrusted input and document affected services. …
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External POC / Exploit Code
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