Vulnerability-Lookup

CVE-2026-34379 (GCVE-0-2026-34379)

Vulnerability from cvelistv5 – Published: 2026-04-06 15:21 – Updated: 2026-04-07 03:07

Title

OpenEXR has a misaligned write in LossyDctDecoder_execute leading to undefined behavior (DWA/DWAB decompression)

Summary

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.2.0 to before 3.2.7, 3.3.9, and 3.4.9, a misaligned memory write vulnerability exists in LossyDctDecoder_execute() in src/lib/OpenEXRCore/internal_dwa_decoder.h:749. When decoding a DWA or DWAB-compressed EXR file containing a FLOAT-type channel, the decoder performs an in-place HALF→FLOAT conversion by casting an unaligned uint8_t * row pointer to float * and writing through it. Because the row buffer may not be 4-byte aligned, this constitutes undefined behavior under the C standard and crashes immediately on architectures that enforce alignment (ARM, RISC-V, etc.). On x86 it is silently tolerated at runtime but remains exploitable via compiler optimizations that assume aligned access. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.

Severity ?

7.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H

CWE

CWE-704 - Incorrect Type Conversion or Cast
CWE-787 - Out-of-bounds Write
CWE-843 - Access of Resource Using Incompatible Type ('Type Confusion')

Assigner

GitHub_M

References

URL

	Vendor	Product	Version
	AcademySoftwareFoundation	openexr	Affected: >= 3.2.0, < 3.2.7 Affected: >= 3.3.0, < 3.3.9 Affected: >= 3.4.0, < 3.4.9

FKIE_CVE-2026-34379

Vulnerability from fkie_nvd - Published: 2026-04-06 16:16 - Updated: 2026-04-07 19:04

Severity ?

7.1 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.7	Product, Release Notes
security-advisories@github.com	https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.9	Product, Release Notes
security-advisories@github.com	https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9	Product, Release Notes
security-advisories@github.com	https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-w88v-vqhq-5p24	Exploit, Vendor Advisory

Impacted products

Vendor	Product	Version
openexr	openexr	*
openexr	openexr	*
openexr	openexr	*

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "4E7AA082-2647-4AAD-9902-1E3873882A3D",
              "versionEndExcluding": "3.2.7",
              "versionStartIncluding": "3.2.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "E8321A2E-759A-4B1E-9AAF-0204791F4323",
              "versionEndExcluding": "3.3.9",
              "versionStartIncluding": "3.3.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "94F2D271-636B-4E9E-A04B-40E635A59117",
              "versionEndExcluding": "3.4.9",
              "versionStartIncluding": "3.4.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.2.0 to before 3.2.7, 3.3.9, and 3.4.9, a misaligned memory write vulnerability exists in LossyDctDecoder_execute() in src/lib/OpenEXRCore/internal_dwa_decoder.h:749. When decoding a DWA or DWAB-compressed EXR file containing a FLOAT-type channel, the decoder performs an in-place HALF\u2192FLOAT conversion by casting an unaligned uint8_t * row pointer to float * and writing through it. Because the row buffer may not be 4-byte aligned, this constitutes undefined behavior under the C standard and crashes immediately on architectures that enforce alignment (ARM, RISC-V, etc.). On x86 it is silently tolerated at runtime but remains exploitable via compiler optimizations that assume aligned access. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9."
    }
  ],
  "id": "CVE-2026-34379",
  "lastModified": "2026-04-07T19:04:50.103",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 4.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-04-06T16:16:35.233",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "url": "https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.7"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "url": "https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.9"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "url": "https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-w88v-vqhq-5p24"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-704"
        },
        {
          "lang": "en",
          "value": "CWE-787"
        },
        {
          "lang": "en",
          "value": "CWE-843"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

OPENSUSE-SU-2026:10505-1

Vulnerability from csaf_opensuse - Published: 2026-04-08 00:00 - Updated: 2026-04-08 00:00

Summary

libIex-3_4-33-3.4.9-1.1 on GA media

Severity

Moderate

Notes

Title of the patch: libIex-3_4-33-3.4.9-1.1 on GA media

Description of the patch: These are all security issues fixed in the libIex-3_4-33-3.4.9-1.1 package on the GA media of openSUSE Tumbleweed.

Patchnames: openSUSE-Tumbleweed-2026-10505

CVE-2026-34378

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H