CVE-2015-4412: BSON injection vulnerability in the legal? function in BSON (bson-ruby) gem before 3.0.4 for Ruby allows remot

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2015-4412 is a critical-severity flaw (CVSS 9.8) affecting bson. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

BSON injection vulnerability in the legal? function in BSON (bson-ruby) gem before 3.0.4 for Ruby allows remote attackers to cause a denial of service (resource consumption) or inject arbitrary data via a crafted string.

Why this priority

Critical severity
EPSS top 8%: very likely to be exploited
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	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	4.7% (top 8%)
CISA exploited list	No
Weakness	CWE-400
Published	2018-02-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: bson project

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

Am I affected?

Timeline

2018-02-05 16:29 UTCPublished CVE record published
2026-06-17 00:27 UTCUpdated Record last modified

bson project bson DOWNGRADE

Affected: 3.0.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.0.3 (Debian / Ubuntu)

apt-cache madison bson sudo apt install bson=<VERSION_BEFORE_3.0.3> sudo apt-mark hold bson

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

dnf --showduplicates list bson sudo dnf downgrade bson-<VERSION_BEFORE_3.0.3> sudo dnf versionlock add bson

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-2015-4412?

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

Is CVE-2015-4412 being exploited?

CVE-2015-4412 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-2015-4412 affect?

CVE-2015-4412 affects bson. Severity is critical (CVSS 9.8). BSON injection vulnerability in the legal? function in BSON (bson-ruby) gem before 3.0.4 for Ruby allows remote attackers to cause a denial of service (resource consumption) or inject arbitrary data via a crafted string.

How urgent is CVE-2015-4412?

Priority 67/100. Critical severity; EPSS top 8%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Ruby vulnerabilities

Related CVEs

CVE-2020-7610 CRITICAL 9.8 UPGRADE All versions of bson before 1.1.4 are vulnerable to Deserialization of Untrusted Data
CVE-2015-4411 HIGH 7.5 UPGRADE MITIGATE The Moped::BSON::ObjecId.legal? method in mongodb/bson-ruby before 3.0.4 as used in rubygem-moped allows remot

References

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