Process crash via overlong AMF string copy
Published Aug 31, 2026 · Updated Sep 1, 2026
Heap-based buffer over-read in FLVMeta 1.2.0 through 1.2.2 allows remote attackers to crash the process via a malformed FLV file. During metadata cloning, amf_data_clone uses strdup, which stops at an embedded null byte, then amf_string_new copies the declared AMF length from that shorter allocation without bounds validation. Processing attacker-supplied FLV content is required; the demonstrated result is a process abort, and the maintainer disputes practical exploitability.
Summary
What happened
Heap-based buffer over-read in FLVMeta 1.2.0 through 1.2.2 allows remote attackers to crash the process via a malformed FLV file. During metadata cloning, amf_data_clone uses strdup, which stops at an embedded null byte, then amf_string_new copies the declared AMF length from that shorter allocation without bounds validation. Processing attacker-supplied FLV content is required; the demonstrated result is a process abort, and the maintainer disputes practical exploitability.
The record
- CVE
- CVE-2026-82820
- Published
- Aug 31, 2026
- Updated
- Sep 1, 2026
- Vendor
- Marc Noirot
- Product
- FLVMeta
- Classifications
- CWE-119, CWE-122, T1204.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 31, 2026CVE publishedPublication date reported by the CVE source.
- Sep 1, 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=1.2.0
- Affected versionversion=1.2.1
- Affected versionversion=1.2.2
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.
Weakness, pattern, technique
Public exploit references
- flvmeta_heap_buffer_overflow malformed FLVproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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