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Vulnerability record · CVE-2026-49017 · published 27 May 2026

CVE-2026-49017: Openstack swift vulnerability

Openstack · Swift

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.

7.1 CVSS 4.0 High EPSS 0.36% · top 73.0% CWE-835 · CWE-835
7.1CVSS 4.0 base score
0.36%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
24 Sep 2026Last modified by NVD

Description

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugs.launchpad.net/bugs/2152205 Issue TrackingVendor Advisory
https://review.opendev.org/c/openstack/swift/+/987957 Issue TrackingPatch
https://review.opendev.org/c/openstack/swift/+/988093 Issue TrackingPatch
http://www.openwall.com/lists/oss-security/2026/05/27/9 Mailing ListPatchThird Party Advisory
http://www.openwall.com/lists/oss-security/2026/06/02/6 Mailing ListPatchThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2017-16613Openstack swauth improper authentication vulnerabilityAn issue was discovered in middleware.py in OpenStack Swauth through 1.2.0 when used with OpenStack Swift through 2.15.1. The Swift object store and …EPSS 8.4%9.8CVE-2012-4406Openstack swift deserialization of untrusted data vulnerabilityOpenStack Object Storage (swift) before 1.7.0 uses the loads function in the pickle Python module unsafely when storing and loading metadata in memca…EPSS 6.6%7.5CVE-2016-0738Openstack swift vulnerabilityOpenStack Object Storage (Swift) before 2.3.1 (Kilo), 2.4.x, and 2.5.x before 2.5.1 (Liberty) do not properly close server connections, which allows …EPSS 3.9%7.5CVE-2016-0737Openstack swift vulnerabilityOpenStack Object Storage (Swift) before 2.4.0 does not properly close client connections, which allows remote attackers to cause a denial of service …EPSS 3.8%6.5CVE-2022-47950Openstack swift vulnerabilityAn issue was discovered in OpenStack Swift before 2.28.1, 2.29.x before 2.29.2, and 2.30.0. By supplying crafted XML files, an authenticated user may…EPSS 1.0%5.8CVE-2013-6396Openstack swift vulnerabilityThe OpenStack Python client library for Swift (python-swiftclient) 1.0 through 1.9.0 does not verify X.509 certificates from SSL servers, which allow…EPSS 0.74%5.5CVE-2015-1856Openstack swift permissions and access controls vulnerabilityOpenStack Object Storage (Swift) before 2.3.0, when allow_version is configured, allows remote authenticated users to delete the latest version of an…EPSS 4.0%5.3CVE-2026-50221Openstack swift server-side request forgery (ssrf) vulnerabilityIn OpenStack Swift before 2.37.2, proxy-server does not strip internal update headers (X-Container-Host, X-Container-Device, X-Delete-At-Host, X-Dele…EPSS 0.22%

Source: NIST National Vulnerability Database (record CVE-2026-49017), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.