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Vulnerabilities

Vulnerability · CVE-2026-39886

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry.

Published Apr 21, 2026 · catalog updated Jun 17, 2026 · OpenEXR provides the specification

Check if you run it

No confirmed exploitation is on record for CVE-2026-39886. EPSS is 0.43%. Act only if a listed version of OpenEXR provides the specification is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (OpenEXR provides the specification).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.43%
Remediation
Advisory link
Affected products
cpe openexr/openexr

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. Versions 3.4.0 through 3.4.9 have a signed integer overflow vulnerability in OpenEXR's HTJ2K (High-Throughput JPEG 2000) decompression path. The function in accumulates a bytes-per-line value ( ) using a 32-bit signed integer with no overflow guard. A crafted EXR file with 16,385 FLOAT channels at the HTJ2K maximum width of 32,767 causes to overflow , producing undefined behavior confirmed by UBSan. On an allocator-permissive host where the required ~64 GB allocation succeeds, the wrapped negative value would subsequently be used as a per-scanline pointer advance, which would produce a heap out-of-bounds write. On a memory-constrained host, the allocation fails before is entered. This is the second distinct integer overflow in . CVE-2026-34545 addressed a different overflow in the same function — the pixel-loop counter at line ~302 that overflows when iterating over channels whose exceeds 32,767. The CVE-2026-34545 fix did not touch the accumulator at line 211, which is the subject of this advisory. The accumulator was also not addressed by any of the 8 advisories in the 2026-04-05 v3.4.9 release batch. This finding is structurally identical to CVE-2026-34588 (PIZ overflow in ) and should be remediated with the same pattern. The CVE-2026-34588 fix did not touch . Version 3.4.10 contains a remediation that addresses the vulnerability in .

Are you affected?

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  • cpe openexr/openexrversion unspecified

How to fix CVE-2026-39886

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-39886. EPSS is 0.43%. Act only if a listed version of OpenEXR provides the specification is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-190: Integer Overflow. EPSS 0.43%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 21, 2026 · NIST NVD

    Detected

    OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. Versions 3.4.0 through 3.4.9 have a signed integer overflow vulnerability in OpenEXR's HTJ2K (High-Throughput JPEG 2000) decompression path. The function in accumulates a bytes-per-line value ( ) using a 32-bit signed integer with no overflow guard. A cra

  2. Jun 17, 2026 · NIST NVD

    Updated

    OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. Versions 3.4.0 through 3.4.9 have a signed integer overflow vulnerability in OpenEXR's HTJ2K (High-Throughput JPEG 2000) decompression path. The function in accumulates a bytes-per-line value ( ) using a 32-bit signed integer with no overflow guard. A cra

Sources

  • CVE.orgVulnerability recordCVE-2026-39886

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-39886

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-39886

    OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. Versions 3.4.0 through 3.4.9 have a signed integer overflow vulnerability in OpenEXR's HTJ2K (High-Throughput JPEG 2000) decompression

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.