CVE-2016-9036: An exploitable incorrect return value vulnerability exists in the mp_check function of Tarantool's Msgpuck lib

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2016-9036 is a high-severity flaw (CVSS 7.5) affecting msgpuck. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An exploitable incorrect return value vulnerability exists in the mp_check function of Tarantool's Msgpuck library 1.0.3. A specially crafted packet can cause the mp_check function to incorrectly return success when trying to check if decoding a map16 packet will read outside the bounds of a buffer, resulting in a denial of service vulnerability.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.8% (top 13%)
CISA exploited list	No
Weakness	CWE-125
Published	2016-12-23
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: tarantool

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

Am I affected?

Timeline

2016-12-23 22:59 UTCPublished CVE record published
2026-06-17 00:55 UTCUpdated Record last modified

tarantool msgpuck DOWNGRADE

Affected: 1.0.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0.3 (Debian / Ubuntu)

apt-cache madison msgpuck sudo apt install msgpuck=<VERSION_BEFORE_1.0.3> sudo apt-mark hold msgpuck

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

dnf --showduplicates list msgpuck sudo dnf downgrade msgpuck-<VERSION_BEFORE_1.0.3> sudo dnf versionlock add msgpuck

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-2016-9036?

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

Is CVE-2016-9036 being exploited?

CVE-2016-9036 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-2016-9036 affect?

CVE-2016-9036 affects msgpuck. Severity is high (CVSS 7.5). An exploitable incorrect return value vulnerability exists in the mp_check function of Tarantool's Msgpuck library 1.0.3. A specially crafted packet can cause the mp_check function to incorrectly return success when trying to check if decod

How urgent is CVE-2016-9036?

Priority 58/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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