CVE-2026-71267Network attack vector

Code execution or crash via unchecked entry names

Published Aug 5, 2026 · Updated Aug 5, 2026

Stack buffer overflow in rxi microtar allows attackers to corrupt stack memory via archive entry names longer than 99 bytes. The mtar_write_file_header() and mtar_write_dir_header() functions use strcpy() to place a caller-controlled name in a 100-byte stack field without validating its length. Reachability requires an embedding application to pass an externally influenced filename; the overflow can crash that application or enable code execution with its privileges.

CVSS severity9.8
Critical
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in rxi microtar allows attackers to corrupt stack memory via archive entry names longer than 99 bytes. The mtar_write_file_header() and mtar_write_dir_header() functions use strcpy() to place a caller-controlled name in a 100-byte stack field without validating its length. Reachability requires an embedding application to pass an externally influenced filename; the overflow can crash that application or enable code execution with its privileges.

The record

CVE
CVE-2026-71267
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
rxi
Product
microtar
Classifications
CWE-121
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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 <=*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

rxi · microtarversion=0 <=*

Published CVSS scores

9.8TuranSecCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow

Public exploit references

No public exploit references are available in this record.

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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