OpenEXR ScanLineProcess::run_fill NULL Pointer Write In "reduceMemory" Mode
Summary
When reading a deep scanline image with a large sample count in reduceMemory mode, it is possible to crash a target application with a NULL pointer dereference in a write operation.
Details
In the ScanLineProcess::run_fill function, implemented in src/lib/OpenEXR/ImfDeepScanLineInputFile.cpp, the following code is used to write the fillValue in the sample buffer:
switch (fills.type)
{
case OPENEXR_IMF_INTERNAL_NAMESPACE::UINT:
{
unsigned int fillVal = (unsigned int) (fills.fillValue);
unsigned int* fillptr = static_cast<unsigned int*> (dest);
for ( int32_t s = 0; s < samps; ++s )
fillptr[s] = fillVal; // <--- POTENTIAL CRASH HERE
break;
}However, when reduceMemory mode is enabled in the readDeepScanLine function in src/lib/OpenEXRUtil/ImfCheckFile.cpp, with large sample counts, the sample data will not be read, as shown below:
// limit total number of samples read in reduceMemory mode
//
if (!reduceMemory ||
fileBufferSize + bufferSize < gMaxBytesPerDeepScanline) // <--- CHECK ON LARGE SAMPLE COUNTS AND reduceMemory
{
// SNIP...
try
{
in.readPixels (y);
}Therefore, in those cases, the sample buffer would not be allocated, resulting in a potential write operation on a NULL pointer.
PoC
NOTE: please download the runfill_crash.exr file from the following link:
https://github.com/ShielderSec/poc/tree/main/CVE-2025-48073
- Compile the
exrcheckbinary in a macOS or GNU/Linux machine with ASAN. - Open the
runfill_crash.exrfile with the following command:
exrcheck -m runfill_crash.exr- Notice that
exrcheckcrashes with ASAN stack-trace.
Impact
An attacker may cause a denial of service by crashing the application.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | openexr | >= 3.3.2, < 3.3.3 | 3.3.3 |
Referencias
- https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-qhpm-86v7-phmm
- https://nvd.nist.gov/vuln/detail/CVE-2025-48073
- https://github.com/AcademySoftwareFoundation/openexr
- https://github.com/ShielderSec/poc/tree/main/CVE-2025-48073
- https://pypi.org/project/openexr
- https://github.com/advisories/GHSA-qhpm-86v7-phmm
- Vector CVSS
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N- Debilidad (CWE)
CWE-476- Plataforma
- Python (PyPI)
- Paquete
openexr- Publicada
- 31.07.2025
- Actualizado
- 11.10.2026 13:19
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2026-1748 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-qhpm-86v7-phmm - CC BY 4.0
Historial de vulnerabilidades: openexr
Todas las vulnerabilidades publicadas de este paquete (Python (PyPI)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 15
- Primera → última
- 05.2022 04.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 7
- Media 7
- Baja 1
Divulgaciones por año
- 2022: 2
- 2023: 0
- 2024: 0
- 2025: 4
- 2026: 9
-
OpenEXR ScanLineProcess::run_fill NULL Pointer Write In "reduceMemory" Mode esta entrada
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