CVE-2018-11507: An issue was discovered in Free Lossless Image Format (FLIF) 0.3

This month

MEDIUM 6.5DOWNGRADE

CVE-2018-11507 is a medium-severity flaw (CVSS 6.5) affecting flif. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in Free Lossless Image Format (FLIF) 0.3. An attacker can trigger a long loop in image_load_pnm in image/image-pnm.cpp.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-834
Published	2018-05-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: flif

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

Am I affected?

Timeline

2018-05-28 04:29 UTCPublished CVE record published
2026-06-17 01:36 UTCUpdated Record last modified

flif flif DOWNGRADE

Affected: 0.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.3 (Debian / Ubuntu)

apt-cache madison flif sudo apt install flif=<VERSION_BEFORE_0.3> sudo apt-mark hold flif

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

dnf --showduplicates list flif sudo dnf downgrade flif-<VERSION_BEFORE_0.3> sudo dnf versionlock add flif

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-2018-11507?

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

Is CVE-2018-11507 being exploited?

CVE-2018-11507 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-2018-11507 affect?

CVE-2018-11507 affects flif. Severity is medium (CVSS 6.5). An issue was discovered in Free Lossless Image Format (FLIF) 0.3. An attacker can trigger a long loop in image_load_pnm in image/image-pnm.cpp.

How urgent is CVE-2018-11507?

Priority 44/100. Public exploit reference

Related CVEs

CVE-2019-14373 HIGH 7.8 DOWNGRADE An issue was discovered in image_save_png in image/image-png.cpp in Free Lossless Image Format (FLIF) 0.3
CVE-2018-14876 MEDIUM 5.5 DOWNGRADE An issue was discovered in image_save_png in image/image-png.cpp in Free Lossless Image Format (FLIF) 0.3
CVE-2018-12109 HIGH 7.8 DOWNGRADE An issue was discovered in Free Lossless Image Format (FLIF) 0.3
CVE-2018-10971 MEDIUM 5.5 DOWNGRADE An issue was discovered in Free Lossless Image Format (FLIF) 0.3
CVE-2017-14232 MEDIUM 5.5 DOWNGRADE UPGRADE The read_chunk function in flif-dec.cpp in Free Lossless Image Format (FLIF) 0.3 allows remote attackers to ca

References

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