CVE-2026-49017
published 2026-05-27CVE-2026-49017: 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…
PriorityP337medium6.5CVSS 3.1
AVNACLPRLUINSUCNINAH
EPSS
0.36%
28.4th percentile
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.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| openstack | swift | >= 2.35.1 < 2.35.3 | 2.35.3 |
| openstack | swift | >= 2.36.0 < 2.36.2 | 2.36.2 |
| openstack | swift | 2.36.0 – 2.36.1 | — |
| openstack | swift | >= 2.37.0 < 2.37.2 | 2.37.2 |
| openstack | swift | 2.37.0 – 2.37.1 | — |
| ubuntu | swift | — | — |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
nvdv4.07.1HIGHCVSS: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:X/V:X/RE:X/U:X
vendor_redhat7.1HIGH
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VulDB
OpenStack Swift up to 2.36.1/2.37.1 StreamingInput infinite loop (EUVD-2026-32040 / CNNVD-202605-6099)
vuldb·2026-05-28·CVSS 7.1
CVE-2026-49017 [HIGH] OpenStack Swift up to 2.36.1/2.37.1 StreamingInput infinite loop (EUVD-2026-32040 / CNNVD-202605-6099)
A vulnerability marked as problematic has been reported in OpenStack Swift up to 2.36.1/2.37.1. Affected is the function StreamingInput. Performing a manipulation results in infinite loop.
This vulnerability is cataloged as CVE-2026-49017. It is possible to initiate the attack remotely. There is no exploit available.
It is suggested to upgrade the affected component.
GHSA
OpenStack Swift: s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body
ghsa·2026-05-27
CVE-2026-49017 [HIGH] CWE-835 OpenStack Swift: s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body
OpenStack Swift: s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body
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.
GHSA
GHSA-g7jq-j257-rww2: In OpenStack Swift before 2
ghsa_unreviewed·2026-05-27
CVE-2026-49017 [HIGH] CWE-835 GHSA-g7jq-j257-rww2: In OpenStack Swift before 2
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.
Ubuntu
OpenStack Swift vulnerability
vendor_ubuntu·2026-09-24
CVE-2026-49017 OpenStack Swift vulnerability
Title: OpenStack Swift vulnerability
Summary: OpenStack Swift could be made to crash if it received specially crafted
network traffic from an authenticated user.
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.
Instructions: In general, a standard system update will make all the necessary changes.
Red Hat
openstack-swift: OpenStack Swift: Denial of Service via truncated aws-chunked PUT request
vendor_redhat·2026-05-27·CVSS 7.1
CVE-2026-49017 [HIGH] CWE-835 openstack-swift: OpenStack Swift: Denial of Service via truncated aws-chunked PUT request
openstack-swift: OpenStack Swift: Denial of Service via truncated aws-chunked PUT request
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.
A flaw was found in OpenStack Swift. An authenticated attacker can exploit this vulnerability by sending a specially crafted, truncated `aws-chunked PUT` request body to the `s3api` middleware. This actio
No detection rules found.
No public exploits indexed.
2026-05-27
Published