CVE-2016-9180: perl-XML-Twig: The option to `expand_external_ents`, documented as controlling external entity expansion in XM

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CRITICAL 9.1REMOTEMITIGATE

CVE-2016-9180 is a critical-severity flaw (CVSS 9.1) affecting xml-twig for perl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

perl-XML-Twig: The option to `expand_external_ents`, documented as controlling external entity expansion in XML::Twig does not work. External entities are always expanded, regardless of the option's setting.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.6% (top 11%)
CISA exploited list	No
Weakness	CWE-611
Published	2016-12-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: xmltwig

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2016-12-22 21:59 UTCPublished CVE record published
2026-06-17 00:55 UTCUpdated Record last modified

xmltwig xml-twig for perl MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy xml-twig-for-perl || rpm -q xml-twig-for-perl || xml-twig-for-perl --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

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-2016-9180?

xml-twig for perl: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2016-9180 being exploited?

CVE-2016-9180 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-2016-9180 affect?

CVE-2016-9180 affects xml-twig for perl. Severity is critical (CVSS 9.1). perl-XML-Twig: The option to `expand_external_ents`, documented as controlling external entity expansion in XML::Twig does not work. External entities are always expanded, regardless of the option's setting.

How urgent is CVE-2016-9180?

Priority 59/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Perl vulnerabilities

References

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