CVE-2014-3756: The client in Mumble 1.2.x before 1.2.6 allows remote attackers to force the loading of an external file and c

Routine

MEDIUM 5.0DOWNGRADE

CVE-2014-3756 is a medium-severity flaw (CVSS 5.0) affecting mumble. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The client in Mumble 1.2.x before 1.2.6 allows remote attackers to force the loading of an external file and cause a denial of service (hang and resource consumption) via a crafted string that is treated as rich-text by a Qt widget, as demonstrated by the (1) user or (2) channel name in a Qt dialog, (3) subject common name or (4) email address to the Certificate Wizard, or (5) server name in a tooltip.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-19
Published	2014-11-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mumble

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

Am I affected?

Timeline

2014-11-16 11:59 UTCPublished CVE record published
2026-06-17 00:08 UTCUpdated Record last modified

mumble mumble DOWNGRADE

Affected: 1.2.0 · 1.2.1 · 1.2.2 · 1.2.3 · 1.2.3 rc1 · 1.2.3 rc2 · 1.2.3 rc3 · 1.2.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.2.0 (Debian / Ubuntu)

apt-cache madison mumble sudo apt install mumble=<VERSION_BEFORE_1.2.0> sudo apt-mark hold mumble

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

dnf --showduplicates list mumble sudo dnf downgrade mumble-<VERSION_BEFORE_1.2.0> sudo dnf versionlock add mumble

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-2014-3756?

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

Is CVE-2014-3756 being exploited?

CVE-2014-3756 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-2014-3756 affect?

CVE-2014-3756 affects mumble. Severity is medium (CVSS 5.0). The client in Mumble 1.2.x before 1.2.6 allows remote attackers to force the loading of an external file and cause a denial of service (hang and resource consumption) via a crafted string that is treated as rich-text by a Qt widget, as demo

How urgent is CVE-2014-3756?

Priority 36/100. No elevated risk signals yet.

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References

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