CVE-2025-15571Public exploit

Local process crash via freed thread array

Published Feb 10, 2026 · Updated Feb 10, 2026

Null pointer dereference in lrzip 0.651 allows local users to crash decompression by testing a crafted archive with multiple threads. During a decompression error, clear_rulist frees sinfo->ucthreads while a concurrent ucompthread still indexes that pointer, causing a zero-page read. A user able to run lrzip against the crafted archive can terminate that lrzip process; no confidentiality or integrity impact is reported.

CVSS severity3.3
Low
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in lrzip 0.651 allows local users to crash decompression by testing a crafted archive with multiple threads. During a decompression error, clear_rulist frees sinfo->ucthreads while a concurrent ucompthread still indexes that pointer, causing a zero-page read. A user able to run lrzip against the crafted archive can terminate that lrzip process; no confidentiality or integrity impact is reported.

The record

CVE
CVE-2025-15571
Published
Feb 10, 2026
Updated
Feb 10, 2026
Vendor
Con Kolivas
Product
lrzip
Classifications
CWE-404, CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.651

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Con Kolivas · lrzipversion=0.651

Published CVSS scores

3.3VulDBCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
1.7VulDBAV:L/AC:L/Au:S/C:N/I:N/A:P
1.9VulDBCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-404Improper Resource Shutdown or Release
CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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