🛡️ CVE-2026-49017 — swift

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-835 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

CVE-2026-49017 is classified as CWE-835: Infinite Loop. A loop condition can never become false for some inputs, hanging the process.

Affected software

CVE-2026-49017 is recorded against 2 packages.

  • swift (from 2.37.0)
  • unknown

Timeline and source

Published on 27 May 2026 and last revised on 13 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

nvd.nist.gov (Advisory)
bugs.launchpad.net (Web)
github.com (Package)
review.opendev.org (Web)
review.opendev.org (Web)
www.openwall.com (Web)
www.openwall.com (Web)

CVE-2026-49017 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector 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
CWE CWE-835
Public Exploit ✅ No
Source NVD
Published 2026-05-27
Updated 2026-08-12
Modified 2026-07-13
Fix URL N/A

Affected Packages

Software From version Fixed in
swift 2.37.0 —
unknown — —

Similar Threats

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