7.1

CVE-2026-49017: openstack swift Infinite Loop

CVSS: 7.1v4.0HighAnalyzed
AliasesGHSA-g7jq-j257-rww2PYSEC-2026-3080UBUNTU-CVE-2026-49017
Published 27-05-2026Last modified 02-06-2026
Open JSON

Vulnerability summary

CVE-2026-49017 is a high (CVSS 7.1) Infinite Loop vulnerability in openstack swift. EPSS estimates a 0.36% chance of exploitation in the next 30 days, higher than 28% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.1/10
010
High · v4.0 (CVE.org)
EPSS score
0.36%
0%100%
Low · +0.04 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 27-05-2026
    PublishedVulnerability first disclosed.
  2. 02-06-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

7 scores · 5 sources · 2 versions

EPSS trend

Probability

0.36%

Chance of exploitation in the next 30 days

Percentile

28%

Versus all other CVEs

30-day change

+0.04 pp

From 0.32% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.36%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • swift< 2.35.1-0+deb13u2 | < 2.37.1-4
Openstack1 product
  • swift≥ 2.35.1, < 2.35.3 | ≥ 2.36.0, < 2.36.2 | ≥ 2.37.0, < 2.37.2
PyPI1 product
  • swift≥ 2.36.0, ≤ 2.36.1 | ≥ 2.37.0, ≤ 2.37.1
Ubuntu1 product
  • swiftAll versions (No fix recorded) | < 2.37.1-0ubuntu2.1

4 vendors · 4 products

References

13 links
Show all 13 references