CVE-2017-8923

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    CVE-2017-8923

    Published: 12 May 2017Last Modified: 7 Aug 2026

    Summary:

    Details: The zend_string_extend function in Zend/zend_string.h in PHP through 7.1.5 does not prevent changes to string objects that result in a negative length, which allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact by leveraging a script's use of .= with a long string.

    References: http://www.securityfocus.com/bid/98518, https://security.netapp.com/advisory/ntap-20241227-0007/, https://bugs.php.net/bug.php?id=74577

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -7d959d16546198e8012985109e5689abcae18b5f

    Affected versions

    POST_PHP7_NSAPI_REMOVAL

    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