CVE-2026-42216
CVE-2026-42216 is a critical-severity vulnerability in Openexr with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.
Key facts
- Severity: Critical (CVSS 3.x base score 9.1)
- CVSS v4: 8.8
- EPSS exploit prediction: 0% (28th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-28298
- Weakness: CWE-125
- Affected product: Openexr
- Published:
- Last modified:
Description
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From versions 3.0.0 to before 3.2.9, 3.3.0 to before 3.3.11, and 3.4.0 to before 3.4.11, IDManifest::init() reconstructs strings from a prefix-compressed representation. If the previous string is longer than 255 bytes, the next string is expected to begin with a 2-byte prefix length. The code reads stringList[i][0] and stringList[i][1] without checking that the current string has at least two bytes. This issue has been patched in versions 3.2.9, 3.3.11, and 3.4.11.
Frequently asked questions
- What is CVE-2026-42216?
- OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From versions 3.0.0 to before 3.2.9, 3.3.0 to before 3.3.11, and 3.4.0 to before 3.4.11, IDManifest::init() reconstructs strings from a prefix-compressed representation. If the previous string is longer than 255 bytes, the next string is expected to begin with a 2-byte prefix length. The code reads stringList[i][0] and stringList[i][1] without checking that the current string has at least two bytes. This issue has been patched in versions 3.2.9, 3.3.11, and 3.4.11.
- How severe is CVE-2026-42216?
- CVE-2026-42216 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.
- Is CVE-2026-42216 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-42216?
- CVE-2026-42216 affects Openexr. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-42216?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- Does CVE-2026-42216 have an EU (EUVD) identifier?
- Yes. CVE-2026-42216 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28298.
- When was CVE-2026-42216 published?
- CVE-2026-42216 was published on 2026-05-07 and last updated on 2026-06-30.
References
- https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-65j8-95g9-jgj4
- https://access.redhat.com/security/cve/CVE-2026-42216
- https://bugzilla.redhat.com/show_bug.cgi?id=2467633
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42216.json
Affected products (1)
- cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:*
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