CVE-2026-81879Public exploitHinoki check available

Process crash via PN_XNUM header-count desynchronization

Published Sep 22, 2026 · Updated Sep 22, 2026

Heap out-of-bounds read in radare2 before 6.1.9 allows attackers to terminate radare2 or rabin2 by opening a crafted ELF file. The ELF loader allocates its program-header array from the resolved PN_XNUM count in shdr[0].sh_info, while multiple consumers use the original 65,535 e_phnum value as their loop bound. Exploitation requires an affected tool to inspect the file and is limited to a process crash; memory disclosure and code execution have not been demonstrated.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Heap out-of-bounds read in radare2 before 6.1.9 allows attackers to terminate radare2 or rabin2 by opening a crafted ELF file. The ELF loader allocates its program-header array from the resolved PN_XNUM count in shdr[0].sh_info, while multiple consumers use the original 65,535 e_phnum value as their loop bound. Exploitation requires an affected tool to inspect the file and is limited to a process crash; memory disclosure and code execution have not been demonstrated.

The record

CVE
CVE-2026-81879
Published
Sep 22, 2026
Updated
Sep 22, 2026
Vendor
radareorg
Product
radare2
Classifications
CWE-125, T1499.004, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 22, 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=< 6.2.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

radareorg · radare2version=< 6.2.0

Published CVSS scores

5.5GitHubCVSS:3.1/AV:L/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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Application or System Exploitation
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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