Security readout for executives and security teams
Plain-English summary
CVE-2021-26260 is a flaw in OpenEXR image handling that can make applications crash when processing malicious EXR content. The sources describe denial-of-service impact, not data theft or confirmed remote takeover. Business urgency depends on whether systems process untrusted EXR files in production workflows.
Executive priority
Prioritize patching systems that process external EXR files or run automated media pipelines. Treat this as a service-availability risk rather than a confirmed breach risk based on the supplied evidence.
Technical view
OpenEXR before 3.0.1 has an integer overflow in DwaCompressor that can lead to heap-buffer overflow. The stated impact is application crash for software compiled with OpenEXR. The CVE notes this is distinct from CVE-2021-23215. No CVSS vector is provided in the supplied bundle.
Likely exposure
Exposure is most likely in rendering, media, graphics, content-processing, or pipeline services that use OpenEXR and accept EXR files from users, partners, or automated feeds. Internal-only tools with trusted inputs have lower practical exposure, though dependency updates still matter.
Exploitation context
The supplied sources do not show active exploitation, and the CVE is not listed as KEV. Exploitation would require a vulnerable OpenEXR build and an application path that processes attacker-controlled EXR content. The documented outcome is crashing the target application.
Researcher notes
Evidence supports integer-overflow to heap-buffer-overflow in DwaCompressor before OpenEXR 3.0.1, with crash impact. The bundle lacks CVSS details, exploit evidence, and deeper root-cause data, so conclusions beyond denial of service should be avoided.
Mitigation direction
- Upgrade OpenEXR to 3.0.1 or a vendor-fixed package.
- Apply Fedora or Debian security updates where those packages are used.
- Inventory applications statically or dynamically linked against OpenEXR.
- Restrict untrusted EXR ingestion until patched.
- Monitor vendor advisories for backported fixed package versions.
Validation and detection
- Check deployed OpenEXR library versions and package changelogs.
- Identify services that parse EXR files from untrusted sources.
- Confirm Fedora or Debian advisories are applied on managed hosts.
- Review SBOMs or build manifests for bundled OpenEXR copies.
- Run normal regression tests for EXR-processing workflows after updating.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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Open ATT&CK lookupCVE-2021-26260 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- FEDORA-2021-6af32bfcd2CVE reference · vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1947582CVE reference
- [debian-lts-announce] 20210703 [SECURITY] [DLA 2701-1] openexr security updateCVE reference · mailing-list
- DSA-5299CVE reference · vendor-advisory
- [debian-lts-announce] 20221211 [SECURITY] [DLA 3236-1] openexr security updateCVE reference · mailing-list
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.