🛡️ CVE-2023-29420 — bzip3

🟡 CVSS 6.5 — Medium ⚠️ Exploit Public CWE-119 NVD
6.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

An issue was discovered in libbzip3.a in bzip3 before 1.2.3. There is a crash caused by an invalid memmove in bz3_decode_block.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

CVE-2023-29420 is classified as CWE-119: Improper Restriction of Operations within Memory Buffer Bounds. A read or write is performed without confirming it stays inside the allocated buffer, corrupting adjacent memory.

Affected software

CVE-2023-29420 is recorded against 1 package.

  • bzip3 (fixed in 1.2.3)

Timeline and source

Published on 6 April 2023 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com
github.com
github.com
lists.fedoraproject.org
lists.fedoraproject.org
lists.fedoraproject.org
github.com
github.com
github.com
lists.fedoraproject.org
lists.fedoraproject.org
lists.fedoraproject.org

CVE-2023-29420 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity MEDIUM
CVSS Score 6.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CWE CWE-119
Public Exploit ⚠️ Yes
Source NVD
Published 2023-04-06
Updated 2026-08-11
Modified 2026-06-17

Affected Packages

Software From version Fixed in
bzip3 — 1.2.3

References

Exploit, Issue Tracking, Patch https://github.com/kspalaiologos/bzip3/issues/92
Exploit, Issue Tracking, Patch https://github.com/kspalaiologos/bzip3/issues/92

Similar Threats

Exploit Protection

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CVE-2023-29420 carries CVSS 6.5 Medium rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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