CVE-2015-3649: The open-uri-cached rubygem allows local users to execute arbitrary Ruby code by creating a directory under /t

Routine

HIGH 7.8DOWNGRADE

CVE-2015-3649 is a high-severity flaw (CVSS 7.8) affecting open-uri-cached. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The open-uri-cached rubygem allows local users to execute arbitrary Ruby code by creating a directory under /tmp containing "openuri-" followed by a crafted UID, and putting Ruby code in said directory once a meta file is created.

Why this priority

High severity

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

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 67%)
CISA exploited list	No
Weakness	CWE-20
Published	2017-08-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: open-uri-cached project

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

Am I affected?

Timeline

2017-08-18 16:29 UTCPublished CVE record published
2026-06-17 00:26 UTCUpdated Record last modified

open-uri-cached project open-uri-cached DOWNGRADE

Affected: 0.0.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.0.5

1. Check installed version

apt-cache policy open-uri-cached || rpm -q open-uri-cached || open-uri-cached --version

2. No fixed release: DOWNGRADE to a release before 0.0.5 (Debian / Ubuntu)

apt-cache madison open-uri-cached sudo apt install open-uri-cached=<VERSION_BEFORE_0.0.5> sudo apt-mark hold open-uri-cached

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

dnf --showduplicates list open-uri-cached sudo dnf downgrade open-uri-cached-<VERSION_BEFORE_0.0.5> sudo dnf versionlock add open-uri-cached

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-2015-3649?

open-uri-cached: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2015-3649 being exploited?

CVE-2015-3649 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-2015-3649 affect?

CVE-2015-3649 affects open-uri-cached. Severity is high (CVSS 7.8). The open-uri-cached rubygem allows local users to execute arbitrary Ruby code by creating a directory under /tmp containing "openuri-" followed by a crafted UID, and putting Ruby code in said directory once a meta file is created.

How urgent is CVE-2015-3649?

Priority 36/100. High severity

Software pages

Ruby vulnerabilities

References

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