CVE-2026-82617: The two built-in name-finder patterns exposed by opennlp.tools.namefind.RegexNameFinderFactory - DEFAULT_REGEX

This week

CRITICAL 9.8REMOTEWATCHLISTUPGRADE

CVE-2026-82617 is a critical-severity flaw (CVSS 9.8) affecting opennlp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 45%)
CISA exploited list	No
Weakness	CWE-1333
Published	2026-09-11
Last modified	2026-09-16

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-09-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-11 18:16 UTCPublished CVE record published
2026-09-16 14:05 UTCUpdated Record last modified

apache opennlp UPGRADE

Affected: >= 2.0.0 and < 2.5.12 · 3.0.0 m1 · 3.0.0 m2 · 3.0.0 m3 · 3.0.0 m4 · 3.0.0 m5

Fixed in: 2.5.12

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy opennlp || rpm -q opennlp || opennlp --version

2. UPGRADE to 2.5.12 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade opennlp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade opennlp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison opennlp sudo apt install opennlp=<VERSION_BEFORE_2.0.0> sudo apt-mark hold opennlp

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list opennlp sudo dnf downgrade opennlp-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add opennlp

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Fedora ELN · xfsdump · FIXED · 3.3.0-3.eln159 · FEDORA-2026-6e9bb3f901 · source

sudo dnf upgrade --advisory=FEDORA-2026-6e9bb3f901

Fedora 46 · fio · FIXED · 3.43-2.fc46 · FEDORA-2026-b36219886b · source

sudo dnf upgrade --advisory=FEDORA-2026-b36219886b

Debian 12 · apache-opennlp · NO FIX YET

Debian 13 · apache-opennlp · NO FIX YET

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-82617?

opennlp: upgrade to 2.5.12. Exact commands for each OS are on this page.

Is CVE-2026-82617 being exploited?

CVE-2026-82617 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-82617 affect?

CVE-2026-82617 affects opennlp. Severity is critical (CVSS 9.8). 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 fin

How urgent is CVE-2026-82617?

Priority 61/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

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References

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