CVE-2023-50245 is a critical-severity (CVSS 9.8) CWE-120 vulnerability in afichet/openexr-viewer. 1 public exploit reference exists, so weaponization risk is real. A fix is available for afichet/openexr-viewer — see the affected versions and patch details below.
OpenEXR-viewer memory overflow vulnerability
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
CVE-2023-50245 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 377,333 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
afichet/openexr-viewerReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects GitHub Actions packages — download data is not available via public APIs for these ecosystems.
Description
Just open this exr file through openexr-viewer.
( poc send by email )
This is windbg log file.
[ POC 2 ]
(8660.7e44): Access violation - code c0000005 (!!! second chance !!!)
openexr_viewer+0x27be4:
00007ff713ff7be4 c744880c0000803f mov dword ptr [rax+rcx*4+0Ch],3F800000h ds:0000020a3ac8000c=????????
Attempt to write the value 1.0 to the memory address 0x20A3AC8000C
[ POC 1 ]
(1404.9264): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
openexr_viewer+0x27be4:
00007ff713ff7be4 c744880c0000803f mov dword ptr [rax+rcx*4+0Ch],3F800000h ds:0000029cb371600c=????????
Attempt to write the value 1.0 to the memory address 0x29CB371600C
Credits Team : ZeroPointer 이동하 ( Lee Dong Ha of ZeroPointer Lab ) 정지민 ( Jeong Jimin of ZeroPointer Lab ) 박우진 ( Park Woojin of ZeroPointer Lab ) 전우진 ( Jeon Woojin of ZeroPointer Lab )
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦GitHub Actions | afichet/openexr-viewer | all versions | 0.6.1 |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for afichet/openexr-viewer, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update afichet/openexr-viewer to 0.6.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-50245 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2023-50245 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2023-50245. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2023-50245 in your dependencies?
O3 Security finds CVE-2023-50245 across GitHub Actions dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.