CVE-2010-0831: Directory traversal vulnerability in the extract_jar function in jartool.c in FastJar 0.98 allows remote attac

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MEDIUM 5.8DOWNGRADE

CVE-2010-0831 is a medium-severity flaw (CVSS 5.8) affecting fastjar. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Directory traversal vulnerability in the extract_jar function in jartool.c in FastJar 0.98 allows remote attackers to create or overwrite arbitrary files via a .. (dot dot) in a non-initial pathname component in a filename within a .jar archive, a related issue to CVE-2005-1080. NOTE: this vulnerability exists because of an incomplete fix for CVE-2006-3619.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.8 (Medium)
EPSS exploit chance	3.7% (top 10%)
CISA exploited list	No
Weakness	CWE-22
Published	2010-06-18
Last modified	2026-06-16

Publisher (CNA): Canonical Ltd. · Vendor: matthias klose

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

Am I affected?

Timeline

2010-06-18 18:30 UTCPublished CVE record published
2026-06-16 23:16 UTCUpdated Record last modified

matthias klose fastjar DOWNGRADE

Affected: 0.98

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.98

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.98 (Debian / Ubuntu)

apt-cache madison fastjar sudo apt install fastjar=<VERSION_BEFORE_0.98> sudo apt-mark hold fastjar

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

dnf --showduplicates list fastjar sudo dnf downgrade fastjar-<VERSION_BEFORE_0.98> sudo dnf versionlock add fastjar

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-2010-0831?

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

Is CVE-2010-0831 being exploited?

CVE-2010-0831 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-2010-0831 affect?

CVE-2010-0831 affects fastjar. Severity is medium (CVSS 5.8). Directory traversal vulnerability in the extract_jar function in jartool.c in FastJar 0.98 allows remote attackers to create or overwrite arbitrary files via a .. (dot dot) in a non-initial pathname component in a filename within a .jar arc

How urgent is CVE-2010-0831?

Priority 48/100. Public exploit reference

Related CVEs

CVE-2010-2322 LOW 2.6 DOWNGRADE Absolute path traversal vulnerability in the extract_jar function in jartool.c in FastJar 0.98 allows remote a
CVE-2006-3619 LOW 2.6 DOWNGRADE Directory traversal vulnerability in FastJar 0.93, as used in Gnu GCC 4.1.1 and earlier, and 3.4.6 and earlier

References

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