CVE-2026-20884

HighPublic PoC

Published: 07 April 2026

Published

07 April 2026

Modified

10 April 2026

KEV Added

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Patch

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CVSS Score 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0006 18.0th percentile

Risk Priority 16 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-20884 is a high-severity Integer Overflow or Wraparound (CWE-190) vulnerability in Libraw Libraw. Its CVSS base score is 8.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Client Execution (T1203); ranked at the 18.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified are NIST 800-53 SI-2 (Flaw Remediation) and SI-10 (Information Input Validation).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploitation for Client Execution (T1203) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-2 Flaw Remediation good match

prevent

Directly remediates the integer overflow vulnerability in LibRaw by requiring timely application of patches to affected versions.

SI-10 Information Input Validation partial match

prevent

Requires validation of DNG file inputs to detect and reject specially crafted malicious files before processing in deflate_dng_load_raw.

SI-16 Memory Protection partial match

prevent

Implements memory protections like ASLR and heap hardening to mitigate successful exploitation of the heap buffer overflow.

MITRE ATT&CK Enterprise TechniquesAI

T1203 Exploitation for Client Execution Execution

Adversaries may exploit software vulnerabilities in client applications to execute code.

attack.mitre.org →

T1204.002 Malicious File Execution

An adversary may rely upon a user opening a malicious file in order to gain execution.

attack.mitre.org →

Why these techniques?

Integer overflow leading to heap buffer overflow in image library enables arbitrary code execution via malicious DNG file (T1204.002) or client-side exploitation (T1203).

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

NVD Description

An integer overflow vulnerability exists in the deflate_dng_load_raw functionality of LibRaw Commit 8dc68e2. A specially crafted malicious file can lead to a heap buffer overflow. An attacker can provide a malicious file to trigger this vulnerability.

Deeper analysisAI

An integer overflow vulnerability, tracked as CVE-2026-20884, affects the deflate_dng_load_raw functionality in LibRaw at commit 8dc68e2. This flaw allows a specially crafted malicious file to trigger a heap buffer overflow. LibRaw is a library commonly used for processing raw image files, making applications that rely on it for DNG file handling potentially susceptible.

The vulnerability carries a CVSS v3.1 base score of 8.1 (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H), indicating high severity with network vector, high attack complexity, no privileges or user interaction required, and significant impacts on confidentiality, integrity, and availability. An attacker can exploit it by supplying a malicious file to a vulnerable LibRaw instance, potentially leading to arbitrary code execution or denial of service through the heap overflow.

Mitigation details are available in the Talos Intelligence advisories at https://talosintelligence.com/vulnerability_reports/TALOS-2026-2364 and https://www.talosintelligence.com/vulnerability_reports/TALOS-2026-2364. Security practitioners should review these reports for patch information, workarounds, and affected versions.