CVE-2026-49017In 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.
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No exploitation reported and no EPSS estimate yet.
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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
- 6.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-835
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Sep 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
openstack swift openstack:swift | from 2.35.1 before 2.35.3; from 2.36.0 before 2.36.2; from 2.37.0 before 2.37.2 | NVD |
References
- https://bugs.launchpad.net/bugs/2152205issue-tracking, vendor-advisory
- https://review.opendev.org/c/openstack/swift/+/987957issue-tracking, patch
- https://review.opendev.org/c/openstack/swift/+/988093issue-tracking, patch
- http://www.openwall.com/lists/oss-security/2026/05/27/9mailing-list, patch, third-party-advisory
- http://www.openwall.com/lists/oss-security/2026/06/02/6mailing-list, patch, third-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.