CVE-2021-29453

    Dashboard / Vulnerabilities / CVE-2021-29453

    CVE-2021-29453

    Published: 19 Apr 2021Last Modified: 27 Aug 2026

    Summary:

    Details: matrix-media-repo is an open-source multi-domain media repository for Matrix. Versions 1.2.6 and earlier of matrix-media-repo do not properly handle malicious images which are crafted to be small in file size, but large in complexity. A malicious user could upload a relatively small image in terms of file size, using particular image formats, which expands to have extremely large dimensions during the process of thumbnailing. The server can be exhausted of memory in the process of trying to load the whole image into memory for thumbnailing, leading to denial of service. Version 1.2.7 has a fix for the vulnerability.

    References: https://github.com/turt2live/matrix-media-repo/releases/tag/v1.2.7, https://hub.docker.com/r/turt2live/matrix-media-repo/tags?page=1&ordering=last_updated, https://github.com/turt2live/matrix-media-repo/security/advisories/GHSA-j889-h476-hh9h

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -f94521bb5d250739cf504bf0254a5d3da7783e86

    Affected versions

    v1.2.6
    v1.2.5
    v1.2.4
    v1.2.3
    v1.2.2
    v1.2.1
    v1.2.0

    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-2021-29453 | CVE-DB