CVE-2026-87776

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    CVE-2026-87776

    Published: 11 Sept 2026Last Modified: 12 Sept 2026

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

    Details: 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.

    References: https://cna.openjsf.org/security-advisories.html, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87776.json, https://github.com/expressjs/compression/security/advisories/GHSA-vc2v-76pw-4v95, https://nvd.nist.gov/vuln/detail/CVE-2026-87776

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -0f9707417bd53d41a319fce8bdb80dfa08b435c8

    Affected versions

    v1.8.1
    v1.8.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-87776 | CVE-DB