CVE-2019-15149: core.py in Mitogen before 0.2.8 has a typo that drops the unidirectional-routing protection mechanism in the c

Q: How do I fix CVE-2019-15149?

mitogen: upgrade to 0.2.8. Exact commands for each OS are on this page.

Q: Is CVE-2019-15149 being exploited?

CVE-2019-15149 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2019-15149 affect?

CVE-2019-15149 affects mitogen. Severity is critical (CVSS 9.8). core.py in Mitogen before 0.2.8 has a typo that drops the unidirectional-routing protection mechanism in the case of a child that is initiated by another child. The Ansible extension is unaffected. NOTE: the vendor disputes this issue becau

Q: How urgent is CVE-2019-15149?

Priority 58/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2019-15149 is a critical-severity flaw (CVSS 9.8) affecting mitogen. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

core.py in Mitogen before 0.2.8 has a typo that drops the unidirectional-routing protection mechanism in the case of a child that is initiated by another child. The Ansible extension is unaffected. NOTE: the vendor disputes this issue because it is exploitable only in conjunction with hypothetical other factors, i.e., an affected use case within a library caller, and a bug in the message receiver policy code that led to reliance on this extra pro

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-254
Published	2019-08-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: networkgenomics

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

Am I affected?

Timeline

2019-08-18 20:15 UTCPublished CVE record published
2026-06-17 02:19 UTCUpdated Record last modified

networkgenomics mitogen UPGRADE

Affected: < 0.2.8

Fixed in: 0.2.8

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.2.8 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mitogen

Note

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

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-2019-15149?

mitogen: upgrade to 0.2.8. Exact commands for each OS are on this page.

Is CVE-2019-15149 being exploited?

CVE-2019-15149 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-2019-15149 affect?

CVE-2019-15149 affects mitogen. Severity is critical (CVSS 9.8). core.py in Mitogen before 0.2.8 has a typo that drops the unidirectional-routing protection mechanism in the case of a child that is initiated by another child. The Ansible extension is unaffected. NOTE: the vendor disputes this issue becau

How urgent is CVE-2019-15149?

Priority 58/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Ansible vulnerabilities

References

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