CVE-2019-3881: Bundler prior to 2.1.0 uses a predictable path in /tmp/, created with insecure permissions as a storage location for gems, if locations unde
Noroxi assessment
Priority: Monitor (action score 31/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.52% (FIRST EPSS).
- Someone with local access to the system can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
- Fixed version: rubygem-abrt (AlmaLinux:8) 0.3.0-4.module_el8.5.0+259+8cec6917, 0.3.0-4.module_el8.5.0+2623+08a8ba32; rubygem-abrt-doc (AlmaLinux:8) 0.3.0-4.module_el8.5.0+259+8cec6917, 0.3.0-4.module_el8.5.0+2623+08a8ba32; rubygem-bson (AlmaLinux:8) 4.5.0-1.module_el8.5.0+2623+08a8ba32, 4.5.0-1.module_el8.5.0+250+ba22dbf7.
Low priority for now. Upgrade to rubygem-abrt (AlmaLinux:8) 0.3.0-4.module_el8.5.0+259+8cec6917, 0.3.0-4.module_el8.5.0+2623+08a8ba32; rubygem-abrt-doc (AlmaLinux:8) 0.3.0-4.module_el8.5.0+259+8cec6917, 0.3.0-4.module_el8.5.0+2623+08a8ba32; rubygem-bson (AlmaLinux:8) 4.5.0-1.module_el8.5.0+2623+08a8ba32, 4.5.0-1.module_el8.5.0+250+ba22dbf7 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
Bundler prior to 2.1.0 uses a predictable path in /tmp/, created with insecure permissions as a storage location for gems, if locations under the user's home directory are not available. If Bundler is used in a scenario where the user does not have a writable home directory, an attacker could place malicious code in this directory that would be later loaded and executed.
- Published
- Sep 4, 2020
- Updated
- Jun 16, 2026
- EPSS
- 0.5% · 44th percentile
- CWE
- CWE-427
Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 31 / 40 · 7.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.5%
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| bundler | bundler | cpe:2.3:a:bundler:bundler |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- bundler bundlerbefore 2.1.0
Versions reported by the vendor
Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.
n/a rubygem-bundler
- bundler versions before 2.1.0affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | rubygem-abrt | before 0.3.0-4.module_el8.5.0+259+8cec6917 | 0.3.0-4.module_el8.5.0+259+8cec6917 |
| AlmaLinux:8 | rubygem-abrt | before 0.3.0-4.module_el8.5.0+2623+08a8ba32 | 0.3.0-4.module_el8.5.0+2623+08a8ba32 |
| AlmaLinux:8 | rubygem-abrt-doc | before 0.3.0-4.module_el8.5.0+259+8cec6917 | 0.3.0-4.module_el8.5.0+259+8cec6917 |
| AlmaLinux:8 | rubygem-abrt-doc | before 0.3.0-4.module_el8.5.0+2623+08a8ba32 | 0.3.0-4.module_el8.5.0+2623+08a8ba32 |
| AlmaLinux:8 | rubygem-bson | before 4.5.0-1.module_el8.5.0+2623+08a8ba32 | 4.5.0-1.module_el8.5.0+2623+08a8ba32 |
| AlmaLinux:8 | rubygem-bson | before 4.5.0-1.module_el8.5.0+250+ba22dbf7 | 4.5.0-1.module_el8.5.0+250+ba22dbf7 |
| AlmaLinux:8 | rubygem-bson-doc | before 4.5.0-1.module_el8.5.0+250+ba22dbf7 | 4.5.0-1.module_el8.5.0+250+ba22dbf7 |
| AlmaLinux:8 | rubygem-bson-doc | before 4.5.0-1.module_el8.5.0+2623+08a8ba32 | 4.5.0-1.module_el8.5.0+2623+08a8ba32 |
| AlmaLinux:8 | rubygem-mongo | before 2.8.0-1.module_el8.5.0+250+ba22dbf7 | 2.8.0-1.module_el8.5.0+250+ba22dbf7 |
| AlmaLinux:8 | rubygem-mongo | before 2.8.0-1.module_el8.5.0+2623+08a8ba32 | 2.8.0-1.module_el8.5.0+2623+08a8ba32 |
| AlmaLinux:8 | rubygem-mongo-doc | before 2.8.0-1.module_el8.5.0+2623+08a8ba32 | 2.8.0-1.module_el8.5.0+2623+08a8ba32 |
| AlmaLinux:8 | rubygem-mongo-doc | before 2.8.0-1.module_el8.5.0+250+ba22dbf7 | 2.8.0-1.module_el8.5.0+250+ba22dbf7 |
| AlmaLinux:8 | rubygem-mysql2 | before 0.5.2-1.module_el8.5.0+2623+08a8ba32 | 0.5.2-1.module_el8.5.0+2623+08a8ba32 |
| AlmaLinux:8 | rubygem-mysql2 | before 0.5.2-1.module_el8.5.0+250+ba22dbf7 | 0.5.2-1.module_el8.5.0+250+ba22dbf7 |
| AlmaLinux:8 | rubygem-mysql2-doc | before 0.5.2-1.module_el8.5.0+2623+08a8ba32 | 0.5.2-1.module_el8.5.0+2623+08a8ba32 |
| AlmaLinux:8 | rubygem-mysql2-doc | before 0.5.2-1.module_el8.5.0+250+ba22dbf7 | 0.5.2-1.module_el8.5.0+250+ba22dbf7 |
| AlmaLinux:8 | rubygem-pg | before 1.1.4-1.module_el8.5.0+2623+08a8ba32 | 1.1.4-1.module_el8.5.0+2623+08a8ba32 |
| AlmaLinux:8 | rubygem-pg | before 1.1.4-1.module_el8.5.0+250+ba22dbf7 | 1.1.4-1.module_el8.5.0+250+ba22dbf7 |
| AlmaLinux:8 | rubygem-pg-doc | before 1.1.4-1.module_el8.5.0+250+ba22dbf7 | 1.1.4-1.module_el8.5.0+250+ba22dbf7 |
| AlmaLinux:8 | rubygem-pg-doc | before 1.1.4-1.module_el8.5.0+2623+08a8ba32 | 1.1.4-1.module_el8.5.0+2623+08a8ba32 |
| openSUSE:Leap 15.1 | rubygem-bundler | before 1.16.1-lp151.3.3.1 | 1.16.1-lp151.3.3.1 |
| openSUSE:Leap 15.2 | rubygem-bundler | before 1.16.1-lp152.4.3.1 | 1.16.1-lp152.4.3.1 |
| Red Hat:enterprise_linux:8::appstream | ruby | before 0:2.6.7-107.module+el8.4.0+10830+bbd85cce | 0:2.6.7-107.module+el8.4.0+10830+bbd85cce |
| Red Hat:enterprise_linux:8::appstream | ruby-debuginfo | before 0:2.6.7-107.module+el8.4.0+10830+bbd85cce | 0:2.6.7-107.module+el8.4.0+10830+bbd85cce |
+81
Same product
bundler: all recordsOther highest-scoring records for the same primary product.
- CVE-2016-7954Bundler 1.x might allow remote attackers to inject arbitrary Ruby code into an application by leveraging a gem name collision on a secondary42Plan
- CVE-2020-36327Bundler 1.16.0 through 2.2.9 and 2.2.11 through 2.2.16 sometimes chooses a dependency source based on the highest gem version number, which 37Monitor
- CVE-2021-43809Local Code Execution through Argument Injection via dash leading git url parameter in Gemfile30Monitor
Published before and after this one in the same product
- ← EarlierCVE-2013-0334Oct 31, 2014 · Bundler before 1.7, when multiple top-level source lines are used, allows remote attackers to install arbitrary gems by creating a gem with 21Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| almalinux:rubygem-abrt | 0.3.0-4.module_el8.5.0+259+8cec6917 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:rubygem-abrt-doc | 0.3.0-4.module_el8.5.0+259+8cec6917 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:rubygem-bson | 4.5.0-1.module_el8.5.0+2623+08a8ba32 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:rubygem-bson-doc | 4.5.0-1.module_el8.5.0+250+ba22dbf7 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:rubygem-mongo | 2.8.0-1.module_el8.5.0+250+ba22dbf7 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:rubygem-mongo-doc | 2.8.0-1.module_el8.5.0+250+ba22dbf7 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:rubygem-mysql2 | 0.5.2-1.module_el8.5.0+250+ba22dbf7 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:rubygem-mysql2-doc | 0.5.2-1.module_el8.5.0+250+ba22dbf7 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:rubygem-pg | 1.1.4-1.module_el8.5.0+250+ba22dbf7 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:rubygem-pg-doc | 1.1.4-1.module_el8.5.0+2623+08a8ba32 · AlmaLinux:8 | Package registry (OSV) |
| opensuse:rubygem-bundler | 1.16.1-lp151.3.3.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| red hat:rh-ruby26-ruby | 0:2.6.7-119.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-ruby26-ruby-debuginfo | 0:2.6.7-119.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-ruby26-ruby-devel | 0:2.6.7-119.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-ruby26-ruby-doc | 0:2.6.7-119.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-ruby26-ruby-libs | 0:2.6.7-119.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-ruby26-rubygem-bigdecimal | 0:1.4.1-119.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-ruby26-rubygem-bundler | 0:1.17.2-119.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-ruby26-rubygem-did_you_mean | 0:1.3.0-119.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-ruby26-rubygem-io-console | 0:0.4.7-119.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-ruby26-rubygem-irb | 0:1.0.0-119.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-ruby26-rubygem-json | 0:2.1.0-119.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-ruby26-rubygem-minitest | 0:5.11.3-119.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| rocky linux:ruby | 0:2.6.7-107.module+el8.4.0+593+8d7f9f0c · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:rubygem-abrt | 0:0.3.0-4.module+el8.5.0+738+032c9c02 · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:rubygem-bson | 0:4.5.0-1.module+el8.4.0+593+8d7f9f0c · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:rubygem-mongo | 0:2.8.0-1.module+el8.4.0+593+8d7f9f0c · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:rubygem-mysql2 | 0:0.5.2-1.module+el8.5.0+738+032c9c02 · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:rubygem-pg | 0:1.1.4-1.module+el8.5.0+738+032c9c02 · Rocky Linux:8 | Package registry (OSV) |
| RubyGems:bundler | 2.1.0 | Package registry (OSV) |
+1
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- No account or password is required.
- A user must open a link or visit a page.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-427 · Uncontrolled Search Path ElementCVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
- Hijack Execution Flow:DLL search order hijackingT1574.001
- Hijack Execution Flow: Dylib HijackingT1574.004
- Hijack Execution Flow: Path Interception by PATH Environment VariableT1574.007
- Hijack Execution Flow: Path Interception by Search Order HijackingT1574.008
- Hijack Execution Flow: Path Interception by Unquoted PathT1574.009
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Vendor advisories and official records. Exploit/PoC links are deliberately left out.