CVE-2026-58383
Description
A flaw was found in GIMP's Jeff's Image Format (JIF) parser. A heap-based out-of-bounds write occurs in the ReadJeffsImage() function when a crafted JIF file sets bits-per-pixel to 0, causing the unpack loop to never advance and to write indefinitely past the destination buffer. This could lead to memory corruption, potentially resulting in denial of service or arbitrary code execution.
Statement
A flaw was found in GIMP's Jeff's Image Format (JIF) parser. When a crafted JIF file sets bits-per-pixel to 0, the unpack loop in ReadJeffsImage() never advances and writes past the destination buffer, leading to memory corruption. Successful exploitation requires a user to open a specially crafted JIF file in a build that includes the JIF import path.
Mitigation
None — requires opening a crafted JIF/GIF 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).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.3 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | Low | N/A | N/A |
| User Interaction | Required | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | High | N/A | N/A |
| Integrity Impact | High | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
Write operations could cause memory corruption. In some cases, an adversary can modify control data such as return addresses in order to execute unexpected code.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
Attempting to access out-of-range, invalid, or unauthorized memory could cause the product to crash.
Other
Technical Impact: Unexpected State
Subsequent write operations can produce undefined or unexpected results.
Acknowledgements
Red Hat would like to thank bb1abu for reporting this issue.
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