CVE-2026-3713
Description
A flaw was found in libpng. A local attacker could exploit this vulnerability by manipulating the width/height arguments in the do_pnm2png function of the pnm2png component. This manipulation causes a heap-based buffer overflow, which could lead to information disclosure and denial of service (DoS).
Statement
This MODERATE impact heap-based buffer overflow in the pnm2png utility of libpng requires local execution to exploit.
The libpng packages shipped with Red Hat Enterprise Linux are not affected by this vulnerability.
The issue originates from the pnm2png utility present in the upstream libpng source tree under the contrib/pngminus/ directory. This component is not part of the libpng build process in RHEL, is not included in the packaging specification, and is not present in any shipped binary RPMs.
Mitigation
To mitigate this vulnerability, avoid processing untrusted image data with the `pnm2png` utility. Restrict execution of `pnm2png` to trusted users and ensure that only trusted image files are processed.
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 | 5.3 | N/A | 5.3 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | Low | N/A | Low |
| Integrity Impact | Low | N/A | Low |
| Availability Impact | Low | N/A | Low |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RC:C
Understanding the Weakness (CWE)
Integrity,Availability,Confidentiality
Technical Impact: DoS: Crash, Exit, or Restart; Execute Unauthorized Code or Commands; Read Memory; Modify Memory
If the incorrect calculation is used in the context of memory allocation, then the software may create a buffer that is smaller or larger than expected. If the allocated buffer is smaller than expected, this could lead to an out-of-bounds read or write (CWE-119), possibly causing a crash, allowing arbitrary code execution, or exposing sensitive data.
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