CVE-2026-34544: academysoftwarefoundation openexr Integer Overflow or Wraparound
Vulnerability summary
CVE-2026-34544 is a high (CVSS 8.4) Integer Overflow or Wraparound vulnerability in academysoftwarefoundation openexr. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 10.5% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 2 · Related 2Timeline
- 01-04-2026PublishedVulnerability first disclosed.
- 02-04-2026Last modifiedVulnerability information updated.
Description
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From version 3.4.0 to before version 3.4.8, a crafted B44 or B44A EXR file can cause an out-of-bounds write in any application that decodes it via exr_decoding_run(). Consequences range from immediate crash (most likely) to corruption of adjacent heap allocations (layout-dependent). This issue has been patched in version 3.4.8.
CVSS metrics
9 scores · 7 sources · 2 versions- OSV · PypiEcosystem advisory · calculated8.4HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- OSV · UbuntuEcosystem advisory · calculated8.4HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- OSV · WolfiEcosystem advisory · calculated8.4HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- OSV · ChainguardEcosystem advisory · calculated8.4HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- NVDNIST8.4HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/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
- OSV · DebianEcosystem advisory · calculated7.3HighCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
- NVDNIST7.3HighCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.21%
Chance of exploitation in the next 30 days
Percentile
11%
Versus all other CVEs
30-day change
-0.03 pp
From 0.24% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundOpenexr
Maturity: poc
Weaknesses
CWE · root cause- CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
- CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.
Affected systems
Chainguard8 products
- openexr< 3.4.9-r0
- openexr-dev< 3.4.9-r0
- openexr-doc< 3.4.9-r0
- openexr-libiex< 3.4.9-r0
- openexr-libilmthread< 3.4.9-r0
Wolfi8 products
- openexr< 3.4.9-r0
- openexr-dev< 3.4.9-r0
- openexr-doc< 3.4.9-r0
- openexr-libiex< 3.4.9-r0
- openexr-libilmthread< 3.4.9-r0
Academysoftwarefoundation1 product
- openexr≥ 3.4.0, < 3.4.8
Debian1 product
- openexrAll versions (No fix recorded) | < 3.4.14-0.1
Openexr1 product
- openexr≥ 3.2.0, < 3.2.7 | ≥ 3.3.0, < 3.3.9 | ≥ 3.4.0, < 3.4.8
PyPI1 product
- openexr≥ 3.4.0, < 3.4.8 | ≥ 3.3.0, ≤ 3.3.8 | ≥ 3.2.0, ≤ 3.2.6 | ≥ 3.2.0, < 3.4.8
Ubuntu1 product
- openexrAll versions (No fix recorded)
7 vendors · 21 products
References
11 links- github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-h762-rhv3-h25vX Refsource CONFIRMWEBREPORTAdvisoryExploitVendor Advisory
- github.com/AcademySoftwareFoundation/openexr/commit/35e7aa35e22c1975606be86e859f31cc1fc598eeX Refsource MISCWEBREPORTFIXPatch
- github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.8X Refsource MISCWEBREPORTProductRelease Notes
- pypi.org/project/openexrPACKAGE
