Vulnerability-Lookup

CVE-2026-77301 (GCVE-0-2026-77301)

Vulnerability from cvelistv5 – Published: 2026-09-18 16:38 – Updated: 2026-09-18 17:11

Title

adm-zip: Uncontrolled memory allocation via the declared uncompressed size (DoS)

Summary

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.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-18 17:10 UTC

CWE

CWE-789 - Memory Allocation with Excessive Size Value

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/cthackers/adm-zip/security/adv…	x_refsource_CONFIRM
https://github.com/cthackers/adm-zip/commit/49160…	x_refsource_MISC
https://github.com/cthackers/adm-zip/releases/tag…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
cthackers	adm-zip	Affected: < 0.6.1	guessed

Show details on NVD website

JSON

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GHSA-7Q85-XJ36-VMFC

Vulnerability from github – Published: 2026-09-18 17:18 – Updated: 2026-09-18 17:18

Summary

adm-zip: Uncontrolled memory allocation via the declared uncompressed size (DoS)

Details

Summary

adm-zip allocates an entry's output buffer from the declared uncompressed size (central-directory size field) before validating it against the actual data. A tiny crafted ZIP that declares a huge uncompressed size forces a multi-gigabyte allocation from a few bytes.

Impact

On adm-zip 0.5.17 (latest), Node 24, a 105-byte ZIP with one stored entry declaring size = 1,774,399,200 makes new AdmZip(buf).getEntries()[0].getData() commit ~1.8 GB of resident memory in ~4.4 s before throwing Error: ADM-ZIP: CRC32 checksum failed, roughly 16 million times the input size. Because the buffer is committed before any validation, on a memory-constrained host (containers, serverless, small VMs) the allocation OOM-kills the process before the CRC check (uncatchable), and concurrent requests can exhaust memory even on larger hosts. Any service that reads entries from untrusted ZIPs is exposed to a remote denial of service.

Steps to reproduce

Attachments are not supported in the advisory form, so the 105-byte PoC (sha256 980d34356fbb248fe527b9d0ac3eabc5c99393a374014be6199523de16709386) is inlined as base64 in this self-contained reproducer:

const AdmZip = require('adm-zip');
// 105-byte crafted ZIP, base64-inlined
// sha256 980d34356fbb248fe527b9d0ac3eabc5c99393a374014be6199523de16709386
const b64 = "UEsDBBQAAAAAAAAAAAAAAAAABQAAAAUAAAABAAAAYWhlbGxvUEsBAhQAFAAAAAAAAAAAAAAAAAAFAAAA4C7DaQEAAAAAAAAAAAAAAAAAAAAAAGFQSwUGAAAAAAEAAQAvAAAAJAAAAAAA";
const buf = Buffer.from(b64, "base64");          // 105 bytes
const zip = new AdmZip(buf);
zip.getEntries()[0].getData();   // commits ~1.8 GB, then throws "ADM-ZIP: CRC32 checksum failed"

The single entry declares uncompressed size = 1,774,399,200 with a compressed size of 5. getData() allocates the full declared size before the CRC check runs, so the memory is committed regardless of the (tiny) actual payload.

Root cause

zipEntry.js does Buffer.alloc(<declared uncompressed size>) before checking the declared size against the compressed size / available bytes.

Suggested fix

Validate the declared uncompressed size against the compressed size and a configurable maximum before allocating (yauzl, for example, requires the caller to bound this); reject or stream when the declared size is implausible relative to the input. Happy to send a patch.

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "adm-zip"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.6.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-77301"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-789"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-18T17:18:01Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Summary\nadm-zip allocates an entry\u0027s output buffer from the declared uncompressed size (central-directory `size` field) before validating it against the actual data. A tiny crafted ZIP that declares a huge uncompressed size forces a multi-gigabyte allocation from a few bytes.\n\n### Impact\nOn adm-zip 0.5.17 (latest), Node 24, a 105-byte ZIP with one stored entry declaring size = 1,774,399,200 makes `new AdmZip(buf).getEntries()[0].getData()` commit ~1.8 GB of resident memory in ~4.4 s before throwing `Error: ADM-ZIP: CRC32 checksum failed`, roughly 16 million times the input size. Because the buffer is committed before any validation, on a memory-constrained host (containers, serverless, small VMs) the allocation OOM-kills the process before the CRC check (uncatchable), and concurrent requests can exhaust memory even on larger hosts. Any service that reads entries from untrusted ZIPs is exposed to a remote denial of service.\n\n### Steps to reproduce\nAttachments are not supported in the advisory form, so the 105-byte PoC (sha256 `980d34356fbb248fe527b9d0ac3eabc5c99393a374014be6199523de16709386`) is inlined as base64 in this self-contained reproducer:\n\n```js\nconst AdmZip = require(\u0027adm-zip\u0027);\n// 105-byte crafted ZIP, base64-inlined\n// sha256 980d34356fbb248fe527b9d0ac3eabc5c99393a374014be6199523de16709386\nconst b64 = \"UEsDBBQAAAAAAAAAAAAAAAAABQAAAAUAAAABAAAAYWhlbGxvUEsBAhQAFAAAAAAAAAAAAAAAAAAFAAAA4C7DaQEAAAAAAAAAAAAAAAAAAAAAAGFQSwUGAAAAAAEAAQAvAAAAJAAAAAAA\";\nconst buf = Buffer.from(b64, \"base64\");          // 105 bytes\nconst zip = new AdmZip(buf);\nzip.getEntries()[0].getData();   // commits ~1.8 GB, then throws \"ADM-ZIP: CRC32 checksum failed\"\n```\n\nThe single entry declares uncompressed size = 1,774,399,200 with a compressed size of 5. `getData()` allocates the full declared size before the CRC check runs, so the memory is committed regardless of the (tiny) actual payload.\n\n### Root cause\n`zipEntry.js` does `Buffer.alloc(\u003cdeclared uncompressed size\u003e)` before checking the declared size against the compressed size / available bytes.\n\n### Suggested fix\nValidate the declared uncompressed size against the compressed size and a configurable maximum before allocating (yauzl, for example, requires the caller to bound this); reject or stream when the declared size is implausible relative to the input. Happy to send a patch.",
  "id": "GHSA-7q85-xj36-vmfc",
  "modified": "2026-09-18T17:18:01Z",
  "published": "2026-09-18T17:18:01Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/cthackers/adm-zip/security/advisories/GHSA-7q85-xj36-vmfc"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cthackers/adm-zip/commit/491600683dacb6cb9fe0718a0eeb9cb5eb49afa6"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/cthackers/adm-zip"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cthackers/adm-zip/releases/tag/v0.6.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "adm-zip: Uncontrolled memory allocation via the declared uncompressed size (DoS)"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-77301 (GCVE-0-2026-77301)

GHSA-7Q85-XJ36-VMFC

Summary

Impact

Steps to reproduce

Root cause

Suggested fix

Tags

Sightings

Nomenclature

Related by attack behaviour