UBUNTU-CVE-2026-82617

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Source
https://ubuntu.com/security/CVE-2026-82617
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-82617.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-82617
Upstream
  • CVE-2026-82617
Published
2026-09-11T18:16:00Z
Modified
2026-09-16T11:43:09Z
Severity
  • 10.0 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

The two built-in name-finder patterns exposed by opennlp.tools.namefind.RegexNameFinderFactory - DEFAULT_REGEX_NAME_FINDER.EMAIL and DEFAULT_REGEX_NAME_FINDER.URL - contain ambiguous nested quantifiers. An application that obtains these finders through RegexNameFinderFactory.getDefaultRegexNameFinders(...) and then applies them to untrusted text through RegexNameFinder.find(String[]) or RegexNameFinder.find(String) can be driven into super-linear backtracking or into unbounded matcher recursion by a small crafted input. For the EMAIL pattern, a long run of local-part characters that is never followed by an @ forces the matcher to re-scan to end-of-input from every starting offset. Cost grows quadratically with input length: an input of approximately 32 KB consumes several seconds of CPU in a single find() call and returns no match, and each doubling of the input multiplies the cost roughly four-fold. For the URL pattern, the query-string sub-expression nests a capturing repetition inside an outer repetition. The JDK matcher recurses once per query token, so an input of approximately 4 KB containing many &-separated tokens exhausts the thread stack and causes java.lang.StackOverflowError to propagate out of find(), terminating the calling thread. On a thread created with a smaller stack (for example -Xss512k, typical of server worker pools) approximately 1 KB is sufficient. In both cases an attacker who can supply text for analysis can convert a single request into seconds to minutes of pinned CPU, or into an abrupt thread death, denying service to the embedding application. No authentication, special configuration, or model file is required beyond the application having selected one of the two built-in finders. This issue affects Apache OpenNLP: from 2.0.0 through 2.5.11; from 3.0.0-M1 through 3.0.0-M5. Users are recommended to upgrade to version 2.5.12, or to 3.0.0-M6 for users tracking the 3.0.0 milestone line, which fix the issue.

References

Affected packages

Ubuntu:20.04:LTS / apache-opennlp

Package

Name
apache-opennlp
Purl
pkg:deb/ubuntu/apache-opennlp?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.9.1-2
1.9.2-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libapache-opennlp-java",
            "binary_version": "1.9.2-1"
        },
        {
            "binary_name": "opennlp",
            "binary_version": "1.9.2-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-82617.json"

Ubuntu:22.04:LTS / apache-opennlp

Package

Name
apache-opennlp
Purl
pkg:deb/ubuntu/apache-opennlp?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.9.3-1
1.9.4-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libapache-opennlp-java",
            "binary_version": "1.9.4-1"
        },
        {
            "binary_name": "opennlp",
            "binary_version": "1.9.4-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-82617.json"

Ubuntu:24.04:LTS / apache-opennlp

Package

Name
apache-opennlp
Purl
pkg:deb/ubuntu/apache-opennlp?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.3.0-1
2.3.1-1
2.3.1-2
2.3.2-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libapache-opennlp-java",
            "binary_version": "2.3.2-1"
        },
        {
            "binary_name": "opennlp",
            "binary_version": "2.3.2-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-82617.json"

Ubuntu:26.04:LTS / apache-opennlp

Package

Name
apache-opennlp
Purl
pkg:deb/ubuntu/apache-opennlp?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.5.3-1
2.5.3-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libapache-opennlp-java",
            "binary_version": "2.5.3-1build1"
        },
        {
            "binary_name": "opennlp",
            "binary_version": "2.5.3-1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-82617.json"