CVE-2026-71190
OpenStack Swift Proxy Server Regular Expression Denial of Service
Description
In OpenStack Swift through 2.38.0, the proxy server Accept header parser contains a regular expression vulnerable to catastrophic backtracking (ReDoS). The "qdtext" pattern (?:[^"]|\\.)* allows an unauthenticated remote attacker to send a crafted Accept header that causes exponential CPU consumption in the proxy worker. A payload of 32 backslash-character pairs exceeds 30 seconds of CPU time. No authentication is required. Repeated requests can exhaust all proxy worker threads, resulting in a complete denial of service.
INFO
Published Date :
Aug. 5, 2026, 6:16 a.m.
Last Modified :
Aug. 5, 2026, 6:16 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | HIGH | 8254265b-2729-46b6-b9e3-3dfca2d5bfca | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update OpenStack Swift to a patched version.
- Apply vendor-provided security patches.
- Monitor system performance after update.
- Review proxy server configurations.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-71190.
| URL | Resource |
|---|---|
| https://launchpad.net/bugs/2158771 | |
| https://openwall.com/lists/oss-security/2026/07/28/27 | |
| https://security.openstack.org/ossa/OSSA-2026-031.html |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-71190 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-71190
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-71190 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-71190 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Aug. 05, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://opendev.org/openstack/swift', 'vendor': 'OpenStack', 'product': 'Swift', 'versions': [{'status': 'affected', 'version': '1.9.1', 'lessThan': '2.35.4', 'versionType': 'semver'}, {'status': 'affected', 'version': '2.36.0', 'lessThan': '2.36.3', 'versionType': 'semver'}, {'status': 'affected', 'version': '2.37.0', 'lessThan': '2.37.3', 'versionType': 'semver'}, {'status': 'affected', 'version': '2.38.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}] Added Description In OpenStack Swift through 2.38.0, the proxy server Accept header parser contains a regular expression vulnerable to catastrophic backtracking (ReDoS). The "qdtext" pattern (?:[^"]|\\.)* allows an unauthenticated remote attacker to send a crafted Accept header that causes exponential CPU consumption in the proxy worker. A payload of 32 backslash-character pairs exceeds 30 seconds of CPU time. No authentication is required. Repeated requests can exhaust all proxy worker threads, resulting in a complete denial of service. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-1333 Added Reference https://launchpad.net/bugs/2158771 Added Reference https://openwall.com/lists/oss-security/2026/07/28/27 Added Reference https://security.openstack.org/ossa/OSSA-2026-031.html