CVE-2018-7263: The mad_decoder_run() function in decoder.c in Underbit libmad through 0.15.1b allows remote attackers to caus

Q: How do I fix CVE-2018-7263?

libmad: upgrade to newer than 0.15.1b. Exact commands for each OS are on this page.

Q: Is CVE-2018-7263 being exploited?

CVE-2018-7263 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-7263 affect?

CVE-2018-7263 affects libmad. Severity is critical (CVSS 9.8). The mad_decoder_run() function in decoder.c in Underbit libmad through 0.15.1b allows remote attackers to cause a denial of service (SIGABRT because of double free or corruption) or possibly have unspecified other impact via a crafted file.

Q: How urgent is CVE-2018-7263?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2018-7263 is a critical-severity flaw (CVSS 9.8) affecting libmad. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The mad_decoder_run() function in decoder.c in Underbit libmad through 0.15.1b allows remote attackers to cause a denial of service (SIGABRT because of double free or corruption) or possibly have unspecified other impact via a crafted file. NOTE: this may overlap CVE-2017-11552.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.5% (top 15%)
CISA exploited list	No
Weakness	CWE-415
Published	2018-02-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: underbit

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

Am I affected?

Timeline

2018-02-20 21:29 UTCPublished CVE record published
2026-06-17 02:02 UTCUpdated Record last modified

underbit libmad UPGRADE

Affected: <= 0.15.1b

Fixed in: newer than 0.15.1b

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 0.15.1b (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade libmad

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade libmad

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2018-7263?

libmad: upgrade to newer than 0.15.1b. Exact commands for each OS are on this page.

Is CVE-2018-7263 being exploited?

CVE-2018-7263 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-2018-7263 affect?

CVE-2018-7263 affects libmad. Severity is critical (CVSS 9.8). The mad_decoder_run() function in decoder.c in Underbit libmad through 0.15.1b allows remote attackers to cause a denial of service (SIGABRT because of double free or corruption) or possibly have unspecified other impact via a crafted file.

How urgent is CVE-2018-7263?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

References

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