CVE-2026-118261

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    CVE-2026-118261

    Published: 28 Oct 2026Last Modified: 5 Nov 2026

    Summary: Echo: Decompress permits unbounded gzip expansion in v4

    Details: Echo is a Go web framework. From 4.0.0 until 4.16.1, Echo v4's opt-in Decompress middleware exposes a gzip-decoded request stream without limiting its expanded size. A small compressed request can expand into a very large body when a handler reads or binds it, consuming excessive memory or CPU and allowing repeated or concurrent requests to cause denial of service. The middleware is not enabled by default, and limiting only the compressed request size does not bound the decoded size. This issue is fixed in 4.16.1.

    References: https://github.com/labstack/echo/releases/tag/v4.16.1, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118261.json, https://github.com/labstack/echo/security/advisories/GHSA-h7wr-284f-5qvc, https://nvd.nist.gov/vuln/detail/CVE-2026-118261, https://github.com/labstack/echo/commit/3fb0ba7e17645bb65611e2a08875d0a2f65c421f

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 6d9e043284aea2d07f5fcaf0d3a424eb7d9f6109
    Fixed -600b9855dfbcb22c7e643e43ce397d5248e882b2

    Affected versions

    v4.16.0

    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-2026-118261 | CVE-DB