Security Digest · Vulnerability record
CVE-2023-50245: memory overflow vulnerability in OpenEXR-viewer
OpenEXR-viewer is a viewer for OpenEXR files with detailed metadata probing.
CVSS 9.8 Critical EPSS 1.1% · p64
Should you act?
Critical and remotely reachable
No known exploitation yet, but it is network-reachable without credentials. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- No confirmed exploitation. It is not in CISA’s KEV catalog. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 1.1%, percentile 64: FIRST’s model estimates a 1.1% chance of exploitation activity in the next 30 days, higher than 64% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes
afichet/openexr-viewer(GitHub Actions) < 0.6.1, fixed in 0.6.1. Check your lockfile, including transitive dependencies.
What it is
OpenEXR-viewer is a viewer for OpenEXR files with detailed metadata probing. Versions prior to 0.6.1 have a memory overflow vulnerability. This issue is fixed in version 0.6.1.
From the GitHub advisory
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 !!!) openexrviewer+0x27be4: 00007ff713ff7be4 c744880c0000803f mov dword ptr [rax+rcx4+0Ch],3F800000h ds:0000020a3ac8000c=????????
Attempt to write the value 1.0 to the memory address 0x20A3AC8000C
Weakness type: CWE-120.
Product: afichet/openexr-viewer (GitHub Actions) · Assigned by: GitHub_M · Published: 2023-12-11
Affected and fixed versions
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| GitHub Actions | afichet/openexr-viewer | < 0.6.1 | 0.6.1 |
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| afichet | openexr-viewer | < 0.6.1 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_M | 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: none (no login)
- User interaction: none
- Scope: unchanged
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- FIRST EPSS (model of 2026-10-21): 1.05% probability of exploitation activity in the next 30 days; percentile 64.
Timeline
- — CVE record published by GitHub_M
- — GitHub-reviewed advisory GHSA-99jg-r3f4-rpxj published (critical)
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vulnerability records
- GitHub Advisory GHSA-99jg-r3f4-rpxj github.com
- CVE.org record CVE-2023-50245 cve.org
- NVD entry CVE-2023-50245 nvd.nist.gov
Other references from the CVE record and advisory
- github.com github.com
- github.com github.com
Critical GitHub Actions advisories · Today’s Security Digest