Application crash via oversized FLAC frame block
Published Mar 24, 2026 · Updated Mar 24, 2026
Out-of-bounds read in Furnace before 0.7 allows attackers to crash the application by supplying a crafted FLAC file. flac_buffer_copy reuses a decoder write buffer without checking that the next frame's block size fits the buffer, so a larger frame reads past its bounds. Exploitation requires a user to open the file; the maintainer states that FLAC import first appears in 0.7, leaving exposure in released pre-0.7 builds unclear.
Summary
What happened
Out-of-bounds read in Furnace before 0.7 allows attackers to crash the application by supplying a crafted FLAC file. flac_buffer_copy reuses a decoder write buffer without checking that the next frame's block size fits the buffer, so a larger frame reads past its bounds. Exploitation requires a user to open the file; the maintainer states that FLAC import first appears in 0.7, leaving exposure in released pre-0.7 builds unclear.
The record
- CVE
- CVE-2026-4732
- Published
- Mar 24, 2026
- Updated
- Mar 24, 2026
- Vendor
- tildearrow
- Product
- Furnace
- Classifications
- CWE-125, T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 24, 2026CVE publishedPublication date reported by the CVE source.
- Mar 24, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <0.7
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- heap_overflow_poc FLAC sampleproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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