CVE-2026-42216
Description
A flaw was found in OpenEXR. A remote attacker could exploit a vulnerability in the IDManifest::init() function when processing specially crafted EXR files. The function attempts to reconstruct strings from a prefix-compressed representation. If a previous string exceeds 255 bytes, the subsequent string is expected to have a 2-byte prefix length. However, the code reads these bytes without validating that the current string has at least two bytes, which could lead to information disclosure or a denial of service (DoS).
Statement
This is an Important flaw in OpenEXR that could lead to information disclosure or denial of service. The vulnerability occurs when processing specially crafted EXR files, where an attacker could trigger an out-of-bounds read due to improper validation of string lengths during prefix-compressed string reconstruction. This could impact systems that process untrusted EXR image data.
Mitigation
To mitigate this issue, avoid processing untrusted or unverified EXR image files. Users should exercise caution when opening EXR files from unknown or suspicious sources, as this vulnerability requires user interaction with a malicious file.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 8.1 | 9.1 | 8.1 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | Low | Low | Low |
| Privileges Required | None | None | None |
| User Interaction | Required | None | Required |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | High | High | High |
| Integrity Impact | None | None | None |
| Availability Impact | High | High | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Understanding the Weakness (CWE)
Confidentiality,Integrity
Technical Impact: Read Memory; Modify Memory; Varies by Context
Frequently Asked Questions
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