Script crash via oversized one-shot decompression input
Published May 30, 2025 · Updated May 30, 2025
Buffer overflow in IO::Compress::Brotli before 0.007 allows remote attackers to crash a consuming script via oversized one-shot input. The bundled decoder's BrotliGetRemainingBytes() helper fails to cap its remaining-byte calculation for chunks larger than 2 GiB, permitting an out-of-bounds copy. Exploitation requires a script to process attacker-controlled data with one-shot decompression; the established consequence is a process crash, not code execution.
Summary
What happened
Buffer overflow in IO::Compress::Brotli before 0.007 allows remote attackers to crash a consuming script via oversized one-shot input. The bundled decoder's BrotliGetRemainingBytes() helper fails to cap its remaining-byte calculation for chunks larger than 2 GiB, permitting an out-of-bounds copy. Exploitation requires a script to process attacker-controlled data with one-shot decompression; the established consequence is a process crash, not code execution.
The record
- CVE
- CVE-2020-36846
- Published
- May 30, 2025
- Updated
- May 30, 2025
- Vendor
- Timothy Legge
- Product
- IO::Compress::Brotli
- Classifications
- CWE-1395, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 30, 2025CVE publishedPublication date reported by the CVE source.
- May 30, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=0 <0.007
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What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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