Parser crash via unchecked end-pointer dereference
Published Sep 7, 2026 · Updated Sep 8, 2026
Out-of-bounds read in 92181 markdown allows remote attackers to crash parsers with crafted files ending in a newline. After psr advances the buffer pointer to the exclusive end, lds dereferences that pointer without first checking it against the input boundary. Exposure requires a consuming application to parse attacker-controlled markdown; the demonstrated fault reads one byte past the heap allocation and can terminate the process.
Summary
What happened
Out-of-bounds read in 92181 markdown allows remote attackers to crash parsers with crafted files ending in a newline. After psr advances the buffer pointer to the exclusive end, lds dereferences that pointer without first checking it against the input boundary. Exposure requires a consuming application to parse attacker-controlled markdown; the demonstrated fault reads one byte past the heap allocation and can terminate the process.
The record
- CVE
- CVE-2026-86303
- Published
- Sep 7, 2026
- Updated
- Sep 8, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-125, CWE-119, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 7, 2026CVE publishedPublication date reported by the CVE source.
- Sep 8, 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?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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
- Newline-terminated markdown reproducerproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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