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.
Affected products
openexr: openexr
References10
- github.com/AcademySoftwareFoundation/openexr/security/advisorie… ExploitMitigationVendor Advisory
- github.com/AcademySoftwareFoundation/openexr/security/advisorie… ExploitMitigationVendor Advisory
- access.redhat.com/errata/RHSA-2026:38498
- access.redhat.com/errata/RHSA-2026:38499
- access.redhat.com/errata/RHSA-2026:39024
- access.redhat.com/errata/RHSA-2026:39025
- access.redhat.com/errata/RHSA-2026:39026
- access.redhat.com/errata/RHSA-2026:39027
- access.redhat.com/security/cve/CVE-2026-42216
- bugzilla.redhat.com/show_bug.cgi?id=2467633
Metrics
- CVSS 3.1
-
9.1
CRITICAL
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H - CVSS 4.0
-
8.8
HIGH
Score source: CNA
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 0% percentile: 41 · as of 13 November 2026
- CWE
- CWE-125CWE-130
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.