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Vulnerability · Published Aug 25, 2026 · Assigned by GitHub_M

CVE-2026-59984OpenEXR: Scratch buffer overflow decoding B44-compressed InputFile on ILP32

Medium 5.5

In plain English

A medium-severity out-of-bounds write in openexr from AcademySoftwareFoundation. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.2%top 93.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. OpenEXR versions 3.1.0 through 3.2.10, 3.3.0 through 3.3.12, and 3.4.0 through 3.4.13 are vulnerable on ILP32 builds to an out-of-bounds write. When a crafted B44-compressed scanline EXR causes the logical scratch size to truncate before allocation and uncompress_b44_impl() writes using the attacker-controlled channel width, allowing denial of service and memory corruption. This issue is fixed in versions 3.2.11, 3.3.13, and 3.4.14.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.24openexr3.4.15-r0ALPINE-CVE-2026-59984
Debian:12openexrno fix listedDEBIAN-CVE-2026-59984
Debian:13openexrno fix listedDEBIAN-CVE-2026-59984
Debian:14openexr3.4.14-0.1DEBIAN-CVE-2026-59984
Ubuntu:26.10openexrno fix listedUBUNTU-CVE-2026-59984

Affected products (as reported)

VendorProductVersions
AcademySoftwareFoundation openexr >= 3.1.0, < 3.2.11>= 3.3.0, < 3.3.13>= 3.4.0, < 3.4.14

Weakness: CWE-787 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References