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Heap-based Buffer OverflowWeakness · CWE-122

CVE-2026-41445

HIGH · 8.8 CVSS v3.1 Published 2026-04-20
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
95/100
Remediation priority · Urgent
Remotely reachable No privileges Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
KissFFT before commit 8a8e66e contains an integer overflow vulnerability in the kiss_fftndr_alloc() function in kiss_fftndr.c where the allocation size calculation dimOther*(dimReal+2)*sizeof(kiss_fft_scalar) overflows signed 32-bit integer arithmetic before being widened to size_t, causing malloc() to allocate an undersized buffer. Attackers can trigger heap buffer overflow by providing crafted dimensions that cause the multiplication to exceed INT_MAX, allowing writes beyond the allocated buffer region when kiss_fftndr() processes the data.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-122

Data overflows a buffer allocated on the heap, corrupting neighbouring heap structures and allocator metadata that a patient attacker can groom into control of execution. It is subtler than a stack overflow but just as dangerous. The fix is validating lengths before every write and using safe allocators and bounded operations.

General guidance for the heap-based buffer overflow class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Patch available Apply the vendor patch
Vendor patch github.com →
Recommended fix High confidence

Upgrade to commit 8a8e66e33d692bad1376fe7904d87d767730537f or later in the KissFFT library. Check for the latest stable release that includes this fix.

  1. 1. Identify all applications and build systems that link against the KissFFT library in your environment
  2. 2. Locate the current version of kissfft being used (check source code version or library file)
  3. 3. Obtain the fixed version by cloning or pulling from the KissFFT repository: git clone https://github.com/mborgerding/kissfft.git
  4. 4. Navigate to the repository and check out the fixed commit: git checkout 8a8e66e33d692bad1376fe7904d87d767730537f
  5. 5. Rebuild the KissFFT library from source using the fixed commit
  6. 6. Rebuild all dependent applications with the new library
  7. 7. Redeploy the updated applications to all affected systems
  8. 8. Verify that the integer overflow in kiss_fftndr_alloc() no longer occurs by testing with crafted input dimensions exceeding INT_MAX
Caveat The fix addresses an integer overflow in size calculation; the API remains unchanged. However, rebuilt applications should be regression tested.

Generated from the published advisory — verify against the referenced sources before acting.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

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Peer-ranked notes from engineers who’ve handled CVE-2026-41445 in production — separate from our analysis above.

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