CVE-2018-12108: An issue was discovered in Dropbox Lepton 1.2.1

This month

MEDIUM 5.5DOWNGRADE

CVE-2018-12108 is a medium-severity flaw (CVSS 5.5) affecting lepton. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in Dropbox Lepton 1.2.1. The validateAndCompress function in validation.cc allows remote attackers to cause a denial of service (SIGFPE and application crash) via a malformed file.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-20
Published	2018-06-11
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: dropbox

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

Am I affected?

Timeline

2018-06-11 13:29 UTCPublished CVE record published
2026-06-17 01:37 UTCUpdated Record last modified

dropbox lepton DOWNGRADE

Affected: 1.2.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.2.1 (Debian / Ubuntu)

apt-cache madison lepton sudo apt install lepton=<VERSION_BEFORE_1.2.1> sudo apt-mark hold lepton

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

dnf --showduplicates list lepton sudo dnf downgrade lepton-<VERSION_BEFORE_1.2.1> sudo dnf versionlock add lepton

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-2018-12108?

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

Is CVE-2018-12108 being exploited?

CVE-2018-12108 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-2018-12108 affect?

CVE-2018-12108 affects lepton. Severity is medium (CVSS 5.5). An issue was discovered in Dropbox Lepton 1.2.1. The validateAndCompress function in validation.cc allows remote attackers to cause a denial of service (SIGFPE and application crash) via a malformed file.

How urgent is CVE-2018-12108?

Priority 41/100. Public exploit reference

Software pages

Dropbox vulnerabilities

Related CVEs

CVE-2022-4104 MEDIUM 5.5 DOWNGRADE A loop with an unreachable exit condition can be triggered by passing a crafted JPEG file to the Lepton image
CVE-2022-26181 HIGH 7.8 DOWNGRADE Dropbox Lepton v1.2.1-185-g2a08b77 was discovered to contain a heap-buffer-overflow in the function aligned_de
CVE-2018-20820 MEDIUM 5.5 DOWNGRADE read_ujpg in jpgcoder.cc in Dropbox Lepton 1.2.1 allows attackers to cause a denial-of-service (application ru
CVE-2018-20819 HIGH 7.8 DOWNGRADE io/ZlibCompression.cc in the decompression component in Dropbox Lepton 1.2.1 allows attackers to cause a denia
CVE-2017-8891 MEDIUM 5.5 DOWNGRADE Dropbox Lepton 1.2.1 allows DoS (SEGV and application crash) via a malformed lepton file because the code does

References

← Back to latest CVEs