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CVE-2026-81878

📛 CVE Title

radare2: Integer overflow causes heap out-of-bounds write in radare2 PYC parser

⬇ Download JSON

Description

radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's CPython bytecode .pyc marshal parser was vulnerable because the CPython marshal readers accepted a 32-bit string length without rejecting values that overflow the size-plus-one allocation. The vulnerability is triggered by opening or inspecting a crafted .pyc file through r2 or rabin2. A length of 0xffffffff wrapped the allocation to zero before the common byte reader wrote attacker-controlled data and fill bytes beyond the heap allocation. This can cause heap memory corruption and denial of service; arbitrary code execution is possible but has not been demonstrated. This issue is fixed in version 6.2.0.

Overview

State
PUBLISHED
Assigner (CNA)
GitHub_M
CVSS severity
MEDIUM
CVSS score
CVSS 5.5 / 10 5.5 5.5 / 10
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Effective score
5.5 / 10 MEDIUM source: CNA overview
CWE(s)
CWE-190, CWE-787
Reserved
2026-08-27
Published
2026-09-22 15:07 UTC
Last updated
2026-09-22 17:55 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/81xxx/CVE-2026-81878.json

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published
2026-09-22 16:18:02 UTC
NVD last modified
2026-09-22 18:17:20 UTC
NVD CVSS v3.1
CVSS 5.5 / 10 5.5 5.5 / 10 MEDIUM source: security-advisories@github.com
NVD CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Exploitability subscore
1.8 / 10
Impact subscore
3.6 / 10

NVD / KEV / EPSS data refreshed 2026-09-23 02:39 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID
EUVD-2026-84503
Assigner
GitHub_M
Published
Sep 22, 2026, 3:07:45 PM
Updated
Sep 22, 2026, 5:55:51 PM
EUVD base score (CVSS 3.1)
5.5 / 10
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
EUVD-reported EPSS
0.0000
Vendors
radareorg
Products
radare2 (< 6.2.0)

ENISA description: radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's CPython bytecode .pyc marshal parser was vulnerable because the CPython marshal readers accepted a 32-bit string length without rejecting values that overflow the size-plus-one allocation. The vulnerability is triggered by opening or inspecting a crafted .pyc file through r2 or rabin2. A length of 0xffffffff wrapped the allocation to zero before the common byte reader wrote attacker-controlled data and fill bytes beyond the heap allocation. This can cause heap memory corruption and denial of service; arbitrary code execution is possible but has not been demonstrated. This issue is fixed in version 6.2.0.

EUVD references (5)

Affected products (1)
VendorProductVersionsPlatforms
radareorg radare2 < 6.2.0 (affected) —

Vendor references (5)

References embedded in the original CVE record by the assigning CNA.

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (6)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

Remediations (10)

  • URGENT UPDATE: Active Exploitation of Two Chained PaperCut NG/MF ...
    web:arcticwolf.com

    Learn about two actively exploited PaperCut NG/MF vulnerabilities that can be chained for unauthenticated remote code execution, and the urgent steps organizations should take to mitigate risk.

    2026-09-23 15:43 UTC
  • Microsoft Patch Tracker (September 2026): Exploit-Ranked | Senserva
    web:senserva.com

    Every Microsoft security patch (KB) and the CVEs it fixes, with severity, CVSS, and CISA KEV status. Cross-linked to the CVE reference.

    2026-09-23 15:43 UTC
  • September 8, 2026—KB5122878 (OS Builds 19045.7725 and 19044.7725 ...
    web:support.microsoft.com

    This security update includes fixes and quality improvements that are part of the following updates: August 11, 2026—KB5120249 (OS Builds 19045.7663 and 19044.7663) The following is a summary of the issues that this update addresses when you install this update. If there are new features, it lists them as well. The bold text within the brackets indicates the item or area of the change we are ...

    2026-09-23 15:43 UTC
  • PaperCut NG/MF Zero-day Vulnerability Exploited in the Attacks (CVE ...
    web:threatprotect.qualys.com

    PaperCut released an Urgent Security Advisory to address two actively exploited vulnerabilities, tracked as CVE - 2026 -82078 & CVE - 2026 -81578, impacting all versions of PaperCut NG and PaperCut MF.

    2026-09-23 15:43 UTC
  • PaperCut NG/MF Zero-Day CVE-2026-81578 | watchTowr
    web:watchtowr.com

    Patch immediately. Upgrade PaperCut NG/MF to the latest version and emergency patch , addressing CVE - 2026 -81578, CVE - 2026 -82078, and bypasses. Restart the PaperCut application service. Once forensic evidence has been captured, restart the service to remove in-memory implants. Patching alone does not remove an existing shell.

    2026-09-23 15:43 UTC
  • CVE-2026-62878: Patch Windows DNS Server RCE Flaw
    web:windowsforum.com

    Microsoft published CVE - 2026 -62878 on August 11 as a Windows DNS Server Remote Code Execution Vulnerability, putting systems that run the Windows DNS Server role into the immediate patch -and-verify queue.

    2026-09-23 15:43 UTC
  • August's Patch Tuesday is a monster: 751 fixes, with an exploited ...
    web:www.computerworld.com

    August's Patch Tuesday is a big one: 751 fixes, an exploited WinSock flaw and plenty of critical Windows, Office and Exchange issues.

    2026-09-23 15:43 UTC
  • PaperCut Discloses Zero-Day Vulnerabilities (CVE-2026-82078 and CVE ...
    web:www.esentire.com

    THE THREAT 2026 -09-02 Update: On September 1st, 2026 , PaperCut Software released Emergency Patch (Release 3) for customers with Internet-facing PaperCut NG/MF Application Servers that are unable to perform other mitigating actions. eSentire has observed incidents involving the…

    2026-09-23 15:43 UTC
  • PaperCut NG/MF vulnerabilities exploited in zero-day attacks
    web:www.helpnetsecurity.com

    PaperCut Software has pinpointed the two vulnerabilities chained in these attacks and urged users to install a second patch .

    2026-09-23 15:43 UTC
  • CVE-2026-81878: radareorg radare2: radare2 is a UNIX-like ... - Rapid7
    web:www.rapid7.com

    CVE-2026-81878 : radareorg radare2: radare2 is a UNIX-like reverse engineering framework and command-line toolset. View severity, references, and remediation details from Rapid7.

    2026-09-23 15:43 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-81878.json.

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  "containers": {
    "adp": [
      {
        "metrics": [
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              "content": {
                "id": "CVE-2026-81878",
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                "timestamp": "2026-09-22T17:54:59.836434Z",
                "version": "2.0.3"
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