CVE-2026-34588 (GCVE-0-2026-34588)

Vulnerability from cvelistv5 – Published: 2026-04-06 15:31 – Updated: 2026-06-30 12:09
VLAI
Title
OpenEXR has a signed 32-bit Overflow in PIZ Decoder Leads to OOB Read/Write
Summary
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.
Severity
8.6 (High)
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
URL Tags
https://github.com/AcademySoftwareFoundation/open… x_refsource_CONFIRM
https://github.com/AcademySoftwareFoundation/open… x_refsource_MISC
https://github.com/AcademySoftwareFoundation/open… x_refsource_MISC
https://github.com/AcademySoftwareFoundation/open… x_refsource_MISC
https://access.redhat.com/security/cve/CVE-2026-34588 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2455408 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:17656 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:15888 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19146 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19587 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:17659 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:17658 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:17660 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:15887 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19359 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30078 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30089 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30088 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30087 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version
AcademySoftwareFoundation openexr Affected: >= 3.1.0, <= 3.1.13
Affected: >= 3.2.0, < 3.2.7
Affected: >= 3.3.0, < 3.3.9
Affected: >= 3.4.0, < 3.4.9
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Red Hat Red Hat Enterprise Linux AppStream EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux AppStream (v. 10)     cpe:/o:redhat:enterprise_linux:10.1
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.9.0)     cpe:/a:redhat:rhel_e4s:9.0::appstream
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.9.2)     cpe:/a:redhat:rhel_e4s:9.2::appstream
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Red Hat Red Hat Enterprise Linux AppStream EUS (v.9.4)     cpe:/a:redhat:rhel_eus:9.4::appstream
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Red Hat Red Hat Enterprise Linux AppStream EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::appstream
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Red Hat Red Hat Enterprise Linux AppStream (v. 9)     cpe:/a:redhat:enterprise_linux:9::appstream
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)     cpe:/o:redhat:enterprise_linux:10.1
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat CodeReady Linux Builder EUS (v.9.4)     cpe:/a:redhat:rhel_eus:9.4::crb
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Red Hat Red Hat CodeReady Linux Builder EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::crb
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)     cpe:/a:redhat:enterprise_linux:9::crb
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Red Hat Red Hat AI Inference Server 3.3     cpe:/a:redhat:ai_inference_server:3.3::el9
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-34588\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-04-06T16:16:35.893\",\"lastModified\":\"2026-06-30T03:18:56.003\",\"vulnStatus\":\"Modified\",\"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 3.1.0 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. 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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-06-30T03:52:38+00:00",
      "cve": "CVE-2026-34588",
      "id": "CVE-2026-34588",
      "initial_release_date": "2026-04-06T15:31:57.602000+00:00",
      "product_status:fixed": "349",
      "product_status:known_affected": "7",
      "product_status:known_not_affected": "3",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "OpenEXR: OpenEXR: Arbitrary code execution and information disclosure via crafted EXR file",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34588.json",
      "version": "3"
    },
    "vulnrichment": {
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      "cveMetadata": "{\"cveId\": \"CVE-2026-34588\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-13T15:09:46.065Z\", \"dateReserved\": \"2026-03-30T16:56:30.999Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-04-06T15:31:57.602Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





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

Author Source Type Date Other

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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.