CVE-2026-82617 Apache OpenNLP - Denial of Service

Apache OpenNLP 2.0.0 through 2.5.11 and 3.0.0-M1 through 3.0.0-M5 contain a denial of service caused by ambiguous nested quantifiers in built-in RegexNameFinder patterns for EMAIL and URL, letting attackers supply crafted text to cause excessive CPU usage or thread crashes, exploit requires attacker to supply untrusted text for analysis.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.77% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
11 September 2026
Updated
15 October 2026
Weakness
CWE-1333

Vendor fix

Upgrade to version 2.5.12 or 3.0.0-M6.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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