CVE-2026-34588: CWE-125: Out-of-bounds Read in AcademySoftwareFoundation openexr
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.1.0 to before 3.2.7, 3.3.9, and 3.4.9, internal_exr_undo_piz() advances the working wavelet pointer with signed 32-bit arithmetic. Because nx, ny, and wcount are int, a crafted EXR file can make this product overflow and wrap. The next channel then decodes from an incorrect address. The wavelet decode path operates in place, so this yields both out-of-bounds reads and out-of-bounds writes. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.
AI Analysis
Technical Summary
The vulnerability CVE-2026-34588 in AcademySoftwareFoundation's OpenEXR affects versions from 3.1.0 up to but not including 3.2.7, 3.3.9, and 3.4.9. The internal_exr_undo_piz() function uses signed 32-bit arithmetic to advance a wavelet pointer, but due to integer overflow and wraparound caused by crafted EXR files, the next channel decodes from an incorrect memory address. Since the wavelet decode operates in place, this results in both out-of-bounds reads and writes, leading to potential arbitrary code execution and information disclosure. Red Hat has released patches for affected OpenEXR packages in their Enterprise Linux 10.0 Extended Update Support, addressing this issue. The vulnerability has a CVSS 4.0 base score of 8.6, indicating high severity.
Potential Impact
Exploitation of this vulnerability can lead to arbitrary code execution and information disclosure due to out-of-bounds memory reads and writes triggered by specially crafted EXR files. The vulnerability affects the integrity and confidentiality of systems processing malicious EXR images. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
A fix is available and has been released by Red Hat for OpenEXR in Red Hat Enterprise Linux 10.0 Extended Update Support. Users should apply the updated OpenEXR packages provided by Red Hat to remediate this vulnerability. Refer to Red Hat advisory RHSA-2026:17656 and the article https://access.redhat.com/articles/11258 for detailed update instructions. No additional mitigation steps are indicated beyond applying the official patches.
CVE-2026-34588: CWE-125: Out-of-bounds Read in AcademySoftwareFoundation openexr
Description
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.1.0 to before 3.2.7, 3.3.9, and 3.4.9, internal_exr_undo_piz() advances the working wavelet pointer with signed 32-bit arithmetic. Because nx, ny, and wcount are int, a crafted EXR file can make this product overflow and wrap. The next channel then decodes from an incorrect address. The wavelet decode path operates in place, so this yields both out-of-bounds reads and out-of-bounds writes. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.
CVSS v4.0
Score 8.6high
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-34588 in AcademySoftwareFoundation's OpenEXR affects versions from 3.1.0 up to but not including 3.2.7, 3.3.9, and 3.4.9. The internal_exr_undo_piz() function uses signed 32-bit arithmetic to advance a wavelet pointer, but due to integer overflow and wraparound caused by crafted EXR files, the next channel decodes from an incorrect memory address. Since the wavelet decode operates in place, this results in both out-of-bounds reads and writes, leading to potential arbitrary code execution and information disclosure. Red Hat has released patches for affected OpenEXR packages in their Enterprise Linux 10.0 Extended Update Support, addressing this issue. The vulnerability has a CVSS 4.0 base score of 8.6, indicating high severity.
Potential Impact
Exploitation of this vulnerability can lead to arbitrary code execution and information disclosure due to out-of-bounds memory reads and writes triggered by specially crafted EXR files. The vulnerability affects the integrity and confidentiality of systems processing malicious EXR images. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
A fix is available and has been released by Red Hat for OpenEXR in Red Hat Enterprise Linux 10.0 Extended Update Support. Users should apply the updated OpenEXR packages provided by Red Hat to remediate this vulnerability. Refer to Red Hat advisory RHSA-2026:17656 and the article https://access.redhat.com/articles/11258 for detailed update instructions. No additional mitigation steps are indicated beyond applying the official patches.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:19359
- Cve Count
- 1
- State
- PUBLISHED
Threat ID: 6a3da1c54853345fc181ff52
Added to database: 06/25/2026, 21:46:45 UTC
Last enriched: 07/15/2026, 15:51:35 UTC
Last updated: 09/10/2026, 19:42:37 UTC
Views: 55
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