RUSTSEC-2026-0447

    Dashboard / Vulnerabilities / RUSTSEC-2026-0447

    RUSTSEC-2026-0447

    Published: 6 Nov 2026Last Modified: 6 Nov 2026

    Summary: Compressed request bodies can exhaust memory before extractor limits apply

    Details: Body extractors do not pass their size limits to the decompression layer. A small compressed request can therefore cause a large allocation before the extractor rejects the decoded body. A remote attacker can use this to exhaust memory or CPU resources and cause denial of service. This affects applications that read compressed request bodies with the corresponding compression feature enabled. Upgrade to actix-web 4.18.2 or later with actix-http 3.20.1 or later. As a workaround, reject compressed request bodies at a reverse proxy or in middleware before body extraction.

    References: https://crates.io/crates/actix-web, https://rustsec.org/advisories/RUSTSEC-2026-0447.html, https://github.com/actix/actix-web/commit/0d0be61bd757027bfcecbc53df1b7a600f21ecd0

    Affected packages

    Package

    Name: actix-web

    Purl: pkg:cargo/actix-web

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 0.0.0-0
    Fixed -4.18.2

    Affected versions

    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
    RUSTSEC-2026-0447 | CVE-DB