# CVE-2026-68516 — AcademySoftwareFoundation openexr

> As of 2026-08-24, CVE-2026-68516 is a MEDIUM-severity vulnerability in AcademySoftwareFoundation openexr, CVSS v3.1 6.5. No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-68516 as of 2026-08-24; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-24

## What is CVE-2026-68516?

OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. From version 3.4.0 through 3.4.13, a crafted HTJ2K-compressed EXR can crash OpenEXR during normal decode. An HTJ2K-compressed EXR whose JPEG 2000 SIZ fields place the first tile outside the visible image can reach invalid tile and codeblock geometry in the vendored OpenJPH AVX2 decoder, causing a stack out-of-bounds write and denial of service. OpenEXR's HTJ2K path validates the decoded codestream dimensions against the EXR chunk size, but it does not reject SIZ image-offset/tile-grid geometry where the first tile does not intersect the image. This issue is fixed in version 3.4.14.

The record classifies CVE-2026-68516 under weakness classes [CWE-787](https://intel.threadlinqs.com/cwe/CWE-787), [CWE-121](https://intel.threadlinqs.com/cwe/CWE-121). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first, and has high impact on availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 42 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 6.5 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.3/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-24

## Is CVE-2026-68516 being exploited?

It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **AcademySoftwareFoundation**: openexr

## How to fix CVE-2026-68516

No vendor patch reference has been recorded for CVE-2026-68516 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-68516

No threat campaign in the Threadlinqs corpus currently references CVE-2026-68516, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org. Last verified by Threadlinqs on 2026-08-25.

**Vendor advisory and patch**

- [github.com](https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-fw66-6xph-56jm)

**Other references**

- [github.com](https://github.com/AcademySoftwareFoundation/openexr/commit/45521f92104373b5c850f27f2d4659ab6759e848)
- [github.com (85009d840cc085aa96ad03ae76fa6463defeb0e5)](https://github.com/AcademySoftwareFoundation/openexr/commit/85009d840cc085aa96ad03ae76fa6463defeb0e5)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-68516
Full detection coverage and IOCs for threats exploiting CVE-2026-68516 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp