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CVE-2026-65979— OpenEXR: Out-of-bounds read in HTJ2K decoder from unvalidated chunk header length (PLEN)

Quick assessment

Affected
AcademySoftwareFoundation openexr
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenEXR 是 EXR 图像格式的参考实现和标准规范，在电影工业中被广泛使用。从版本 3.4.0 到 3.4.12，HTJ2K 解码器从数据块的压缩数据中解析一个头长度字段（PLEN），但在使用该值之前从未检查该值是否不超过可用缓冲区大小。在解码过程中，解码器会将码流指针前进由攻击者提供的头大小，并将计算得到的偏移量和剩余长度传递给 OpenJPH 的内存输入路径，因此构造的值会使指针超出缓冲区末尾，导致越界读取。由于该字段直接来自攻击者可控的 EXR 数据块内容，因此在解析不受信任的文件进行正常解码时即可触发

CVSS 6.7 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
AcademySoftwareFoundation openexr >= 3.4.0, < 3.4.13 affected
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I. Basic Information for CVE-2026-65979

Vulnerability Information
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Vulnerability Title
OpenEXR: Out-of-bounds read in HTJ2K decoder from unvalidated chunk header length (PLEN)
Source: CVE Program / CVE List V5
Vulnerability Description
OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. From version 3.4.0 through 3.4.12, the HTJ2K decoder parses a header-length field (PLEN) from a chunk's compressed data but never checks that this value fits within the available buffer before using it. When decoding, it advances the codestream pointer by the attacker-supplied header size and passes the resulting offset and remaining length to the OpenJPH memory-input path, so a crafted value pushes the pointer past the end of the buffer and causes an out-of-bounds read. Because this field comes straight from attacker-controlled EXR chunk data, the flaw is reachable during normal decoding of an untrusted file. This issue is fixed in version 3.4.13.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
AcademySoftwareFoundation openexr >= 3.4.0, < 3.4.13 -

II. Public POCs for CVE-2026-65979

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III. Intelligence Information for CVE-2026-65979

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Patches & Fixes for CVE-2026-65979 (2)

Vendor Advisories for CVE-2026-65979 (1)

Same Patch Batch · AcademySoftwareFoundation · 2026-08-25 · 20 CVEs total

CVE-2026-59982 7.1 HIGH OpenEXR: DWAA InputFile AC buffer overflow on ILP32 platforms
CVE-2026-59981 7.1 HIGH OpenEXR: Heap OOB read in SampleCountChannel row when using nonzero dataWindow
CVE-2026-68515 7.1 HIGH OpenEXR: Heap out-of-bounds write in exrmultiview with subsampled channel union
CVE-2026-68513 7.1 HIGH OpenEXR: Heap buffer overflow in PyOpenEXR from literal/prefixed RGB channel name collisio
CVE-2026-59189 7.1 HIGH OpenEXR: Out-of-bounds read in DeepImageChannel::row() for non-zero dataWindow origin
CVE-2026-59187 7.1 HIGH OpenEXR: exrmetrics deep pixelmode heap buffer overflow
CVE-2026-59186 7.1 HIGH OpenEXR: Heap out-of-bounds write in TiledRgbaInputFile via integer overflow on 32-bit (IL
CVE-2026-59184 7.1 HIGH OpenEXR: OpenEXRUtil FlatImageChannel row nonzero dataWindow heap OOB write
CVE-2026-55371 6.9 MEDIUM OpenEXR: OpenEXRCore exr_attr_set_bytes() accepts NULL type_hint with positive hint_length
CVE-2026-55373 6.2 MEDIUM OpenEXR: OpenEXRUtil SampleCountChannel endEdit() can loop forever on UINT_MAX sample coun
CVE-2026-55059 6.1 MEDIUM OpenEXR: OpenEXRUtil SampleCountChannel row setter heap has an out-of-bounds write vulnera
CVE-2026-59984 5.5 MEDIUM OpenEXR: Scratch buffer overflow decoding B44-compressed InputFile on ILP32
CVE-2026-59983 5.5 MEDIUM OpenEXR: Out-of-bounds read in DeepTiledInputFile sample-count table decode on ILP32
CVE-2026-59985 5.5 MEDIUM OpenEXR: Heap out-of-bounds read in OpenEXRCore RLE decoding on ILP32
CVE-2026-61555 5.5 MEDIUM OpenEXR: Empty multiView viewFromChannelName file crash
CVE-2026-68514 5.5 MEDIUM OpenEXR: Heap buffer overflow in PyOpenEXR from literal/prefixed RGB channel name collisio
CVE-2026-59183 5.5 MEDIUM OpenEXR: Signed Integer Overflow Leading to Out-of-Bounds Memory Access in Deep Tile Decod
CVE-2026-62986 4.3 MEDIUM OpenEXR: PyOpenEXR deep prefixed RGB stale lane disclosure
CVE-2026-54920 OpenEXR: Integer overflow and uninitialized pointer cause invalid delete in OpenEXRUtil im

IV. Related Vulnerabilities

Same product: openexr
Same vendor: AcademySoftwareFoundation
Same weakness: CWE-20

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