SB2026082601 - Fedora 43 update for mingw-openexr
Published: August 26, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 vulnerabilities.
1) Integer overflow (CVE-ID: CVE-2026-59183)
CWE-ID: CWE-190 - Integer overflow
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to integer overflow in unpack_sample_table() in src/lib/OpenEXRCore/decoding.c when parsing a crafted deep tiled EXR file. A remote attacker can trick the victim into opening a crafted file to cause a denial of service.
User interaction is required to open a crafted file. Exploitation requires processing deep tiled EXR content through the OpenEXRCore decoding path.
2) Integer overflow (CVE-ID: CVE-2026-55373)
CWE-ID: CWE-190 - Integer overflow
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to integer overflow or wraparound in roundListSizeUp() in OpenEXRUtil SampleCountChannel when processing a sample count of UINT_MAX. A remote attacker can supply a UINT_MAX sample count through the public API to cause a denial of service.
The issue results in an infinite CPU loop in both the endEdit() path and the direct set(x, y, UINT_MAX) path.
3) Out-of-bounds write (CVE-ID: CVE-2026-55059)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to out-of-bounds write in Imf_4_0::SampleCountChannel::set(int r, unsigned int newNumSamples[]) when processing row-based sample-count updates through the OpenEXRUtil DeepImage API. A remote attacker can trick the victim into opening a crafted file to cause a denial of service.
User interaction is required, and exploitation requires image data windows whose X and Y origins differ.
Remediation
Install update from vendor's website.