OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. Versions 3.4.0 through 3.4.9 have a signed integer overflow vulnerability in OpenEXR's HTJ2K (High-Throughput JPEG 2000) decompression path. The `ht_undo_impl()` function in `src/lib/OpenEXRCore/internal_ht.cpp` accumulates a bytes-per-line value (`bpl`) using a 32-bit signed integer with no overflow guard. A crafted EXR file with 16,385 FLOAT channels at the HTJ2K maximum width of 32,767 causes `bpl` to overflow `INT_MAX`, producing undefined behavior confirmed by UBSan. On an allocator-permissive host where the required ~64 GB allocation succeeds, the wrapped negative `bpl` value would subsequently be used as a per-scanline pointer advance, which would produce a heap out-of-bounds write. On a memory-constrained host, the allocation fails before `ht_undo_impl()` is entered. This is the second distinct integer overflow in `ht_undo_impl()`. CVE-2026-34545 addressed a different overflow in the same function — the `int16_t p` pixel-loop counter at line ~302 that overflows when iterating over channels whose `width` exceeds 32,767. The CVE-2026-34545 fix did not touch the `int bpl` accumulator at line 211, which is the subject of this advisory. The `bpl` accumulator was also not addressed by any of the 8 advisories in the 2026-04-05 v3.4.9 release batch. This finding is structurally identical to CVE-2026-34588 (PIZ `wcount*nx` overflow in `internal_piz.c`) and should be remediated with the same pattern. The CVE-2026-34588 fix did not touch `internal_ht.cpp`. Version 3.4.10 contains a remediation that addresses the vulnerability in `internal_ht.cpp`.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - OpenEXR provides the specification and reference implementation of the EXR file format, an image storage     format for the motion picture industry. Versions 3.4.0 through 3.4.9 have a signed integer overflow     vulnerability in OpenEXR's HTJ2K (High-Throughput JPEG 2000) decompression path. The `ht_undo_impl()`     function in `src/lib/OpenEXRCore/internal_ht.cpp` accumulates a bytes-per-line value (`bpl`) using a     32-bit signed integer with no overflow guard. A crafted EXR file with 16,385 FLOAT channels at the HTJ2K     maximum width of 32,767 causes `bpl` to overflow `INT_MAX`, producing undefined behavior confirmed by     UBSan. On an allocator-permissive host where the required ~64 GB allocation succeeds, the wrapped negative     `bpl` value would subsequently be used as a per-scanline pointer advance, which would produce a heap out-     of-bounds write. On a memory-constrained host, the allocation fails before `ht_undo_impl()` is entered.
    This is the second distinct integer overflow in `ht_undo_impl()`. CVE-2026-34545 addressed a different     overflow in the same function  the `int16_t p` pixel-loop counter at line ~302 that overflows when     iterating over channels whose `width` exceeds 32,767. The CVE-2026-34545 fix did not touch the `int bpl`     accumulator at line 211, which is the subject of this advisory. The `bpl` accumulator was also not     addressed by any of the 8 advisories in the 2026-04-05 v3.4.9 release batch. This finding is structurally     identical to CVE-2026-34588 (PIZ `wcount*nx` overflow in `internal_piz.c`) and should be remediated with     the same pattern. The CVE-2026-34588 fix did not touch `internal_ht.cpp`. Version 3.4.10 contains a     remediation that addresses the vulnerability in `internal_ht.cpp`. (CVE-2026-39886)

Note that Nessus relies on the presence of the package as reported by the vendor.

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the 7b83af27-3a86-11f1-90cd-41d47652b1c2 advisory.

    Cary Phillips reports:
    OpenEXR 3.4.10 is a patch release that addresses the following security vulnerabilities:

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
309639	Linux Distros Unpatched Vulnerability : CVE-2026-39886	Nessus	Misc.	medium
307584	FreeBSD : OpenEXR -- several integer overflow vulnerabilities (7b83af27-3a86-11f1-90cd-41d47652b1c2)	Nessus	FreeBSD Local Security Checks	high

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CVE-2026-39886

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