CVE-2026-71190: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-4jj7-q8c5-78g4
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CWE-1333
Published
Advisory Summary

CVE-2026-71190 is a HIGH security vulnerability vulnerability (CWE-1333: Inefficient Regular Expression Complexity) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-71190 at a Glance

CVE Identifier CVE-2026-71190
GHSA Identifier GHSA-4jj7-q8c5-78g4
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-1333: Inefficient Regular Expression Complexity
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-71190

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-71190, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-1333: Inefficient Regular Expression Complexity, where the product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

References

NVD — CVE-2026-71190 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-71190
launchpad.net/bugs/2158771 WEB
https://launchpad.net/bugs/2158771
Software Security Information SECURITY
https://openwall.com/lists/oss-security/2026/07/28/27
Software Security Information SECURITY
https://security.openstack.org/ossa/OSSA-2026-031.html
Software Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/08/05/19

Frequently Asked Questions

What is CVE-2026-71190?
CVE-2026-71190 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-1333: Inefficient Regular Expression Complexity.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-71190?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-71190?
CVE-2026-71190 is classified under CWE-1333: Inefficient Regular Expression Complexity (The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.).
How can I check Maven dependencies for CVE-2026-71190?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-4jj7-q8c5-78g4",
  "modified" : "2026-08-05T21:31:36Z",
  "published" : "2026-08-05T06:30:32Z",
  "aliases" : [ "CVE-2026-71190" ],
  "details" : "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.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/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"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-71190"
  }, {
    "type" : "WEB",
    "url" : "https://launchpad.net/bugs/2158771"
  }, {
    "type" : "WEB",
    "url" : "https://openwall.com/lists/oss-security/2026/07/28/27"
  }, {
    "type" : "WEB",
    "url" : "https://security.openstack.org/ossa/OSSA-2026-031.html"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2026/08/05/19"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1333" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-05T06:16:40Z"
  }
}