CVE-2023-29415: An issue was discovered in libbzip3.a in bzip3 before 1.3.0

Q: How do I fix CVE-2023-29415?

bzip3: upgrade to 1.3.0; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2023-29415 being exploited?

CVE-2023-29415 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-2023-29415 affect?

CVE-2023-29415 affects bzip3, debian linux. Severity is medium (CVSS 6.5). An issue was discovered in libbzip3.a in bzip3 before 1.3.0. A denial of service (process hang) can occur with a crafted archive because bzip3 does not follow the required procedure for interacting with libsais.

Q: How urgent is CVE-2023-29415?

Priority 48/100. Public exploit reference; On your watchlist

This month

MEDIUM 6.5WATCHLISTUPGRADEMITIGATE

CVE-2023-29415 is a medium-severity flaw (CVSS 6.5) affecting bzip3, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in libbzip3.a in bzip3 before 1.3.0. A denial of service (process hang) can occur with a crafted archive because bzip3 does not follow the required procedure for interacting with libsais.

Why this priority

Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Published	2023-04-06
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: bzip3 project · debian

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

Am I affected?

Timeline

2023-04-06 05:15 UTCPublished CVE record published
2026-06-17 05:50 UTCUpdated Record last modified

bzip3 project bzip3 UPGRADE

Affected: < 1.3.0

Fixed in: 1.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy bzip3 || rpm -q bzip3 || bzip3 --version

2. UPGRADE to 1.3.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade bzip3

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade bzip3

Note

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

debian debian linux MITIGATE

Affected: 12.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 12.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2023-29415?

bzip3: upgrade to 1.3.0; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-29415 being exploited?

CVE-2023-29415 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-2023-29415 affect?

CVE-2023-29415 affects bzip3, debian linux. Severity is medium (CVSS 6.5). An issue was discovered in libbzip3.a in bzip3 before 1.3.0. A denial of service (process hang) can occur with a crafted archive because bzip3 does not follow the required procedure for interacting with libsais.

How urgent is CVE-2023-29415?

Priority 48/100. Public exploit reference; On your watchlist

Software pages

Debian vulnerabilities

Related CVEs

CVE-2023-29421 HIGH 8.8 UPGRADE An issue was discovered in libbzip3.a in bzip3 before 1.2.3
CVE-2023-29420 MEDIUM 6.5 UPGRADE An issue was discovered in libbzip3.a in bzip3 before 1.2.3
CVE-2023-29419 MEDIUM 6.5 UPGRADE An issue was discovered in libbzip3.a in bzip3 before 1.2.3
CVE-2023-29418 MEDIUM 6.5 UPGRADE An issue was discovered in libbzip3.a in bzip3 before 1.2.3
CVE-2023-29417 MEDIUM 6.5 DOWNGRADE An issue was discovered in libbzip3.a in bzip3 1.2.2

References

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