CVE-2026-49017Disclosure(openstack / swift)

LOWCVSS 6.5 · MEDIUM

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

Hunt for exploitation attempts and persistence artifacts
Increase monitoring for publicly documented tradecraft
Track advisory updates for patch or workaround availability

Recommended action window: High priority (within 72h)

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.

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1.5/ 10 priority

Sources & remediation

Patch / fix

Vendor / third-party advisories

https://bugs.launchpad.net/bugs/2152205

Weakness type (CWE)

CWE-835

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

swift

Threat summary

Public PoC is present in monitored signal
1 mentions across 1 observed day

What's happening

PoC mentioned or linked in 1 signal
Technical details provided in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Affected systems

Vendors

openstack

Products

swift

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Referenced assets1 URL

By indicator

https://www.openwall.com/lists/oss-security/2026/05/27/9

Full discourse1 post

Open Source Security mailing list@oss_security137d
Disclosure
OSSA-2026-014,CVE-2026-49017: OpenStack Swift: Swift proxy-server DoS via truncated s3api chunked upload https://www.openwall.com/lists/oss-security/2026/05/27/9 An authenticated user can send a truncated aws-chunked PUT request that causes a proxy-server worker to enter an infinite loop
Post summary
The text discloses a DoS vulnerability in OpenStack Swift's proxy server that can be triggered by authenticated users sending a truncated S3 API chunked upload, causing an infinite loop.
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CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	openstack	swift	-	-	-

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