CVE-2019-5918: Nablarch 5 (5, and 5u1 to 5u13) allows remote attackers to conduct XML External Entity (XXE) attacks via unspe

This month

CRITICAL 9.1REMOTEDOWNGRADE

CVE-2019-5918 is a critical-severity flaw (CVSS 9.1) affecting nablarch. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Nablarch 5 (5, and 5u1 to 5u13) allows remote attackers to conduct XML External Entity (XXE) attacks via unspecified vectors.

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	1.9% (top 21%)
CISA exploited list	No
Weakness	CWE-611
Published	2019-03-12
Last modified	2026-06-17

Publisher (CNA): JPCERT/CC · Vendor: nablarch project

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

Am I affected?

Timeline

2019-03-12 22:29 UTCPublished CVE record published
2026-06-17 02:38 UTCUpdated Record last modified

nablarch project nablarch DOWNGRADE

Affected: 5 · 5u1 · 5u13

Fixed in: no fixed release known

Safe to downgrade to: a release before 5

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5 (Debian / Ubuntu)

apt-cache madison nablarch sudo apt install nablarch=<VERSION_BEFORE_5> sudo apt-mark hold nablarch

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list nablarch sudo dnf downgrade nablarch-<VERSION_BEFORE_5> sudo dnf versionlock add nablarch

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.

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-2019-5918?

nablarch: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-5918 being exploited?

CVE-2019-5918 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-2019-5918 affect?

CVE-2019-5918 affects nablarch. Severity is critical (CVSS 9.1). Nablarch 5 (5, and 5u1 to 5u13) allows remote attackers to conduct XML External Entity (XXE) attacks via unspecified vectors.

How urgent is CVE-2019-5918?

Priority 57/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2019-5919 CRITICAL 9.1 DOWNGRADE An incomplete cryptography of the data store function by using hidden tag in Nablarch 5 (5, and 5u1 to 5u13) a

References

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