How severe is CVE-2026-49017?

CVE-2026-49017 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-49017 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-49017?

CVE-2026-49017 affects Openstack Swift. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-49017?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-49017 have an EU (EUVD) identifier?

Yes. CVE-2026-49017 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-32040.

When was CVE-2026-49017 published?

CVE-2026-49017 was published on 2026-05-27 and last updated on 2026-09-24.

CVE-2026-49017

CVE-2026-49017 is a medium-severity vulnerability in Openstack Swift with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-835.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 7.1
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-32040
Weakness: CWE-835
Affected product: Openstack Swift
Published: 2026-05-27
Last modified: 2026-09-24

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.

Frequently asked questions

What is CVE-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 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 severe is CVE-2026-49017?: CVE-2026-49017 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-49017 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-49017?: CVE-2026-49017 affects Openstack Swift. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-49017?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-49017 have an EU (EUVD) identifier?: Yes. CVE-2026-49017 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-32040.
When was CVE-2026-49017 published?: CVE-2026-49017 was published on 2026-05-27 and last updated on 2026-09-24.

References

Affected products (1)

cpe:2.3:a:openstack:swift:*:*:*:*:*:*:*:*

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