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CRITICAL severity

memory overflow vulnerability in OpenEXR-viewerGHSA-99jg-r3f4-rpxj

CRITICALFix: afichet/openexr-viewer@d0a7e85

GHSA-99jg-r3f4-rpxj is a critical-severity (CVSS 9.8) CWE-120 vulnerability in afichet/openexr-viewer. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for afichet/openexr-viewer — see the affected versions and patch details below.

Also known asCVE-2023-50245
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 2, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.1%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs64th percentile — riskier than 64% of all scored CVEsHighest risk
0.37%1.58%2.79%4.01%3.3%1.1%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
📦afichet/openexr-viewer

Real-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

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦GitHub Actionsafichet/openexr-viewerall versions0.6.1

Affected Products

1 product · 1 configurations
Application
openexr viewerafichet
< 0.6.1
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

OpenEXR-viewer is a viewer for OpenEXR files with detailed metadata prob…

github.comNVDDec 2023

Detection & mitigation playbook

Open-source dependency

  1. Detect

    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.

  2. 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 GHSA-99jg-r3f4-rpxj is resolved across your whole dependency graph.

  3. 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.

Frequently Asked Questions

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: 00007ff7`13ff7be4 c744880c0000803f mov dword ptr [rax+rcx*4+0Ch],3F800000h ds:0000020a`3ac8000c=???????? 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: 00007ff7`13ff
O3 Security · Impact-Aware SCA

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memory overflow vulnerability in OpenEXR-viewer