Vulnerability-Lookup

GHSA-VC2V-76PW-4V95

Vulnerability from github – Published: 2026-10-05 23:28 – Updated: 2026-10-05 23:28

Summary

compression vulnerable to Denial of Service via memory leak on premature response close

Details

Impact

A vulnerability in compression < 1.8.2 allows an attacker to trigger a Denial of Service (DoS) by disconnecting while a compressed response is being sent. When the client aborts the connection before the response finishes, the zlib stream created to compress that response is never destroyed, so each aborted compressed response leaks its native zlib memory. Repeated aborted requests can exhaust available memory. All applications using compression are affected.

Patches

Users should upgrade to 1.8.2.

Workarounds

None.

Severity

7.5 (High)


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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "compression"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.8.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-87776"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-401",
      "CWE-459"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-05T23:28:01Z",
    "nvd_published_at": "2026-09-11T12:16:52Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nA vulnerability in compression `\u003c 1.8.2` allows an attacker to trigger a Denial of Service (DoS) by disconnecting while a compressed response is being sent. When the client aborts the connection before the response finishes, the zlib stream created to compress that response is never destroyed, so each aborted compressed response leaks its native zlib memory. Repeated aborted requests can exhaust available memory. All applications using compression are affected.\n\n### Patches\n\nUsers should upgrade to `1.8.2`.\n\n### Workarounds\n\nNone.",
  "id": "GHSA-vc2v-76pw-4v95",
  "modified": "2026-10-05T23:28:01Z",
  "published": "2026-10-05T23:28:01Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/expressjs/compression/security/advisories/GHSA-vc2v-76pw-4v95"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-87776"
    },
    {
      "type": "WEB",
      "url": "https://github.com/expressjs/compression/commit/151f63e91e1b64f8fb0b064e19321a4f28db6bff"
    },
    {
      "type": "WEB",
      "url": "https://cna.openjsf.org/security-advisories.html"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/expressjs/compression"
    },
    {
      "type": "WEB",
      "url": "https://github.com/expressjs/compression/releases/tag/v1.8.2"
    }
  ],
  "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": "compression vulnerable to Denial of Service via memory leak on premature response close"
}

CVE-2026-87776 (GCVE-0-2026-87776)

Vulnerability from cvelistv5 – Published: 2026-09-11 11:24 – Updated: 2026-09-11 13:36

Title

compression vulnerable to Denial of Service via memory leak on premature response close

Summary

compression is a Node.js and Express compression middleware. In versions before 1.8.2, when a client aborts the connection while a compressed response is still being sent, the zlib stream created to compress that response is never destroyed, so each aborted compressed response leaks its native zlib memory. A remote unauthenticated attacker can repeatedly open requests and disconnect early, exhausting the available memory and crashing the server. All applications using compression are affected. The issue is fixed in compression 1.8.2, and users should upgrade to 1.8.2 or later.

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: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-11 13:30 UTC

CWE

CWE-401 - Missing Release of Memory after Effective Lifetime
CWE-459 - Incomplete Cleanup

Assigner

openjs redhat root Scorecard

References

2 references

URL	Tags
https://github.com/expressjs/compression/security…
https://cna.openjsf.org/security-advisories.html

Impacted products

1 product

Vendor	Product	Version
compression	compression	Affected: 0 , < 1.8.2 (semver) Unaffected: 1.8.2 (semver)

Credits

bjohansebas UlisesGascon Phillip9587 KKamJi98

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JSON

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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.

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.

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