How severe is CVE-2023-50245?

CVE-2023-50245 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2023-50245?

CVE-2023-50245 affects the following packages: afichet/openexr-viewer (GitHub Actions). Ecosystems affected: GitHub Actions.

How do I fix CVE-2023-50245?

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.

How do I detect CVE-2023-50245 in my GitHub Actions dependencies?

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.

How do I mitigate CVE-2023-50245 if there is no patch (or I can't update yet)?

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.

Is CVE-2023-50245 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2023-50245, including 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2023-50245?

CVE-2023-50245 has an EPSS (Exploit Prediction Scoring System) score of 1.1%, placing it in the 64th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2023-50245?

CVE-2023-50245 is classified as CWE-120 (CWE-120). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2023-50245 published, and has it been updated?

CVE-2023-50245 was published on December 11, 2023 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦

📦 GitHub Actions

Not in CISA KEV

CRITICAL severity

CVE-2023-50245 — openexr-viewer

CRITICALFix: afichet/openexr-viewer@d0a7e85

CVE-2023-50245 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.

OpenEXR-viewer memory overflow vulnerability

Also known asGHSA-99jg-r3f4-rpxj

Published

Dec 11, 2023

Updated

Oct 28, 2026

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

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

Ecosystem	Package	Vulnerable range	Fix
📦GitHub Actions	`afichet/openexr-viewer`	all versions	0.6.1

Affected Products

1 product · 1 configurations

Application

openexr viewerafichet

< 0.6.1

range

Exploits & PoCs

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

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.
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.

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

Is CVE-2023-50245 in your dependencies?

Find it across GitHub Actions, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

9.8/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Raw vector

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

CWE Classification

CWE-120CWE-120

Weaponization

No Nuclei template or Metasploit module yet. 1 public proof-of-concept reference is listed on this page.

Timeline

Disclosed

Dec 11, 2023

First exploit

Dec 14, 2023

3 days after disclosure — rapid exploitation

Last updated

Oct 28, 2026

Identifiers

CVE-2023-50245

GHSA-99jg-r3f4-rpxj

References

Advisorygithub.com · CVE 2023 50245.json Advisorygithub.com · GHSA 99jg r3f4 rpxj Advisorynvd.nist.gov · CVE 2023 50245 Fixgithub.com · d0a7e85dfeb519951fb8a8d70f73f30d41cdd3d9 Packagegithub.com · openexr viewer

Related vulnerabilities

This CVE is critical severity; 2 of 8 other CVEs with CWE-120 are rated as high or higher (top: critical).

CVE-2026-55209CVE-2022-41793CVE-2025-26240CVE-2026-54257GHSA-hc3c-63hc-2r9fCVE-2026-27820CVE-2025-64182CVE-2026-27459Browse all CWE-120

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 28, 2026

CVE-2023-50245 — openexr-viewer

EPSS Exploitation Probability

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

Description

Affected Packages

Affected Products

Detection & mitigation playbook

Detect

Fix

Workarounds

Frequently Asked Questions

Is CVE-2023-50245 in your dependencies?