Memory corruption via double cursor stride adjustment
Published Aug 28, 2026 · Updated Aug 28, 2026
Heap overflow in FFmpeg affects Red Hat Enterprise Linux AI 3 and OpenShift AI, allowing remote attackers to crash consumers with TDSC video. The tdsc_load_cursor function's CUR_FMT_MONO path advances the destination pointer by each aligned row, then wrongly adds a second row-end stride adjustment, drifting beyond the heap allocation when cursor width is not divisible by 32. Exploitation requires user interaction to make an affected consumer process attacker-supplied TDSC video; the bounded result is memory corruption and service interruption, with no reported confidentiality impact.
Summary
What happened
Heap overflow in FFmpeg affects Red Hat Enterprise Linux AI 3 and OpenShift AI, allowing remote attackers to crash consumers with TDSC video. The tdsc_load_cursor function's CUR_FMT_MONO path advances the destination pointer by each aligned row, then wrongly adds a second row-end stride adjustment, drifting beyond the heap allocation when cursor width is not divisible by 32. Exploitation requires user interaction to make an affected consumer process attacker-supplied TDSC video; the bounded result is memory corruption and service interruption, with no reported confidentiality impact.
The record
- CVE
- CVE-2026-18393
- Published
- Aug 28, 2026
- Updated
- Aug 28, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat OpenShift AI
- Classifications
- CWE-787, T1204.002
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 28, 2026CVE publishedPublication date reported by the CVE source.
- Aug 28, 2026Record updatedLatest update available in the CVE record.
Exploitability
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What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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