In OpenStack Swift before 2.36.2 and 2.37.2, s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body. The StreamingInput class repeatedly appends an empty buffer and re-reads, causing the proxy-server worker handling the request to become permanently unresponsive with increasing CPU and memory consumption. An authenticated attacker can systematically exhaust all proxy-server workers, resulting in denial of service. The defect was introduced in Swift 2.36.0.

The remote Ubuntu 26.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-8821-1 advisory.

    It was discovered that OpenStack Swift incorrectly handled truncated aws-chunked PUT request bodies in its     s3api middleware. An authenticated attacker could possibly use this issue to cause OpenStack Swift to use     excessive resources, leading to a denial of service.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Debian 13 host has packages installed that are affected by a vulnerability as referenced in the dsa-6314 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6314-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     May 31, 2026                          https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : swift     CVE ID         : CVE-2026-49017

    Alistair Coles discovered that the s3api middleware of Swift, a     distributed virtual object store, was susceptible to denial of service.

    The oldstable distribution (bookworm) is not affected.

    For the stable distribution (trixie), this problem has been fixed in     version 2.35.1-0+deb13u2.

    We recommend that you upgrade your swift packages.

    For the detailed security status of swift please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/swift

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - In OpenStack Swift before 2.36.2 and 2.37.2, s3api middleware enters an infinite loop when processing a     truncated aws-chunked PUT request body. The StreamingInput class repeatedly appends an empty buffer and     re-reads, causing the proxy-server worker handling the request to become permanently unresponsive with     increasing CPU and memory consumption. An authenticated attacker can systematically exhaust all proxy-     server workers, resulting in denial of service. The defect was introduced in Swift 2.36.0.
    (CVE-2026-49017)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
350700	Ubuntu 26.04 LTS : OpenStack Swift vulnerability (USN-8821-1)	Nessus	Ubuntu Local Security Checks	Local	high
318110	Debian dsa-6314 : python3-swift - security update	Nessus	Debian Local Security Checks	Local	high
317301	Linux Distros Unpatched Vulnerability : CVE-2026-49017	Nessus	Misc.	Local	high

Detections

Analytics

CVE-2026-49017

high

Tenable Plugins

high

high

high