CVE-2023-29415Public exploitNetwork attack vector

Process hang via incorrect libsais invocation

Published Apr 6, 2023 · Updated Feb 13, 2025

Denial of service in libbzip3.a in bzip3 before 1.3.0 allows remote attackers to hang a consuming process via a crafted archive. The decompression path passes crafted block data to the embedded libsais Burrows-Wheeler routines without following their required calling procedure, leaving processing at 100 percent CPU without completing. An attacker must supply a malicious archive and induce an application or user to decompress or test it; the bounded consequence is a hang of that consuming process.

CVSS severity6.5
Medium
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in libbzip3.a in bzip3 before 1.3.0 allows remote attackers to hang a consuming process via a crafted archive. The decompression path passes crafted block data to the embedded libsais Burrows-Wheeler routines without following their required calling procedure, leaving processing at 100 percent CPU without completing. An attacker must supply a malicious archive and induce an application or user to decompress or test it; the bounded consequence is a hang of that consuming process.

The record

CVE
CVE-2023-29415
Published
Apr 6, 2023
Updated
Feb 13, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 6, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1204.002Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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