CVE-2007-3231: Buffer overflow in MeCab before 0.96 has unknown impact and attack vectors.

This month

HIGH 7.5DOWNGRADE

CVE-2007-3231 is a high-severity flaw (CVSS 7.5) affecting mecab. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in MeCab before 0.96 has unknown impact and attack vectors.

Why this priority

High severity

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	1.3% (top 30%)
CISA exploited list	No
Published	2007-06-14
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: mecab

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2007-06-14 23:30 UTCPublished CVE record published
2026-06-16 22:41 UTCUpdated Record last modified

mecab mecab DOWNGRADE

Affected: 0.6 · 0.7 · 0.71 · 0.72 · 0.73 · 0.74 · 0.75 · 0.76

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.6

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.6 (Debian / Ubuntu)

apt-cache madison mecab sudo apt install mecab=<VERSION_BEFORE_0.6> sudo apt-mark hold mecab

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

dnf --showduplicates list mecab sudo dnf downgrade mecab-<VERSION_BEFORE_0.6> sudo dnf versionlock add mecab

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-2007-3231?

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

Is CVE-2007-3231 being exploited?

CVE-2007-3231 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-2007-3231 affect?

CVE-2007-3231 affects mecab. Severity is high (CVSS 7.5). Buffer overflow in MeCab before 0.96 has unknown impact and attack vectors.

How urgent is CVE-2007-3231?

Priority 44/100. High severity

References

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