EUVD-2026-83170
GHSA-7q85-xj36-vmfc
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Remotely deliverable untrusted ZIP triggers reliable single-request memory exhaustion with no auth or interaction; strictly availability impact (C:N/I:N), scope unchanged.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
5Blast Radius
ecosystem impact- 3,899 npm packages depend on adm-zip (576 direct, 3,347 indirect)
Ecosystem-wide dependent count for version 0.6.1.
DescriptionCVE.org
adm-zip is a JavaScript library for creating and extracting ZIP archives in Node.js. Prior to 0.6.1, getData() in zipEntry.js trusts an entry's central-directory uncompressed size and allocates output memory before validating that value against the actual compressed data and decompression result. A small crafted ZIP can declare a multi-gigabyte uncompressed size, causing Buffer.alloc and decompression handling to commit excessive resident memory before CRC validation reports an error. Applications that read entries from untrusted archives can therefore be terminated by the operating system or suffer service-wide memory exhaustion. This issue is fixed in version 0.6.1.
AnalysisAI
Memory exhaustion in the adm-zip Node.js library before 0.6.1 allows remote, unauthenticated attackers to crash or severely degrade any service that reads entries from untrusted ZIP archives: a 105-byte crafted archive whose central directory declares an uncompressed size of ~1.77 GB forces the library to commit roughly 1.8 GB of resident memory before validation fails, which OOM-kills memory-constrained processes (containers, serverless, small VMs) and, with concurrency, can exhaust larger hosts. Publicly available exploit code exists - the vendor advisory includes a self-contained 105-byte base64 PoC (sha256 980d34356fbb248fe527b9d0ac3eabc5c99393a374014be6199523de16709386) - and the CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, 7.5) confirms a network-reachable availability-only impact with no privileges or user interaction required. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an application that (1) uses adm-zip prior to 0.6.1 and (2) reads entries from attacker-controlled/untrusted ZIP archives, then calls getData() (directly or via extraction). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but bounded risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade adm-zip to 0.6.1 or later (Vendor-released patch: 0.6.1), as documented in GHSA-7q85-xj36-vmfc (https://github.com/cthackers/adm-zip/security/advisories/GHSA-7q85-xj36-vmfc) and the v0.6.1 release tag (https://github.com/cthackers/adm-zip/releases/tag/v0.6.1); the underlying fix is commit 491600683dacb6cb9fe0718a0eeb9cb5eb49afa6, which caps decompression output at the declared uncompressed size using zlib maxOutputLength (with a 1-byte floor for empty entries), manually enforces the same ceiling on the streaming path and raises MAX_OUTPUT_EXCEEDED, and routes stream errors through the callback instead of allowing uncaught exceptions. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, enumerate every application and dependency tree containing adm-zip before 0.6.1 using npm ls adm-zip, lockfile inspection, or an SBOM/SCA scan, and prioritize internet-facing upload, import, and archive-processing endpoints; at the same time enforce request-body size caps and rate limiting at the reverse proxy or WAF and constrain Node.js memory (container memory limits and --max-old-space-size) with OOM-safe restart policies and alerting so that a single abusive request cannot take down adjacent workloads. …
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