FKIE_CVE-2026-34379

Vulnerability from fkie_nvd - Published: 2026-04-06 16:16 - Updated: 2026-06-30 03:18
Severity
7.1 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
7.1 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
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.
References
security-advisories@github.comhttps://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.7Product, Release Notes
security-advisories@github.comhttps://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.9Product, Release Notes
security-advisories@github.comhttps://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9Product, Release Notes
security-advisories@github.comhttps://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-w88v-vqhq-5p24Exploit, Vendor Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/security/cve/CVE-2026-34379
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://bugzilla.redhat.com/show_bug.cgi?id=2455402
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34379.json
Impacted products
Vendor Product Version
openexr openexr *
openexr openexr *
openexr openexr *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
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          "vendor": "AcademySoftwareFoundation",
          "versions": [
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            },
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              "version": "\u003e= 3.3.0, \u003c 3.3.9"
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        },
        {
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          "vendor": "Red Hat"
        },
        {
          "cpes": [
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          "defaultStatus": "unaffected",
          "product": "Red Hat Enterprise Linux 8",
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        },
        {
          "cpes": [
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          "defaultStatus": "unaffected",
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  "configurations": [
    {
      "nodes": [
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          "cpeMatch": [
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              "criteria": "cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:*",
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              "versionEndExcluding": "3.2.7",
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          "negate": false,
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      ]
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  ],
  "cveTags": [],
  "descriptions": [
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      "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": "2026-06-30T03:18:52.863",
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          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
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          "role": "CISA Coordinator",
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          "version": "2.0.3"
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  "published": "2026-04-06T16:16:35.233",
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  "vulnStatus": "Modified",
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      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
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  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.