CVE-2022-41556

    Dashboard / Vulnerabilities / CVE-2022-41556

    CVE-2022-41556

    Published: 6 Oct 2022Last Modified: 12 Aug 2026

    Summary:

    Details: A resource leak in gw_backend.c in lighttpd 1.4.56 through 1.4.66 could lead to a denial of service (connection-slot exhaustion) after a large amount of anomalous TCP behavior by clients. It is related to RDHUP mishandling in certain HTTP/1.1 chunked situations. Use of mod_fastcgi is, for example, affected. This is fixed in 1.4.67.

    References: https://git.lighttpd.net/lighttpd/lighttpd1.4/commit/b18de6f9264f914f7bf493abd3b6059343548e50, https://github.com/lighttpd/lighttpd1.4/compare/lighttpd-1.4.66...lighttpd-1.4.67, https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/41xxx/CVE-2022-41556.json, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OVOSBSCMLGCHH2Z74H64ZWVDFJFQTBC2/, https://nvd.nist.gov/vuln/detail/CVE-2022-41556, https://security.gentoo.org/glsa/202210-12, https://github.com/lighttpd/lighttpd1.4/pull/115

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- b8e011d230c206503f072cce0c176da8a938cf00
    Fixed -807b3e9a365d740946c5d0fb806459de765c4fa9

    Affected versions

    lighttpd-1.4.65
    lighttpd-1.4.64
    lighttpd-1.4.63
    lighttpd-1.4.62
    lighttpd-1.4.61
    lighttpd-1.4.60
    lighttpd-1.4.59
    lighttpd-1.4.58
    lighttpd-1.4.57
    lighttpd-1.4.56

    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-2022-41556 | CVE-DB