Stack memory disclosure via integer truncation
Published Aug 17, 2026 · Updated Aug 17, 2026
Integer truncation in acf-can-listener.c in COVESA Open1722 through 0.9.2 allows unauthenticated remote attackers to disclose stack memory via UDP. acf-can-listener stores avtp_to_can()'s int return value in the uint8_t num_can_msgs variable, so a -1 rejection becomes 255 and the transmit loop reads far past a 15-entry stack array into adjacent process memory. Exposure requires the optional acf-can-listener example to be built and reachable, and a packet with a matching AVTP stream ID causes roughly 240 CAN frames of leaked stack data to be emitted onto the CAN bus.
Summary
What happened
Integer truncation in acf-can-listener.c in COVESA Open1722 through 0.9.2 allows unauthenticated remote attackers to disclose stack memory via UDP. acf-can-listener stores avtp_to_can()'s int return value in the uint8_t num_can_msgs variable, so a -1 rejection becomes 255 and the transmit loop reads far past a 15-entry stack array into adjacent process memory. Exposure requires the optional acf-can-listener example to be built and reachable, and a packet with a matching AVTP stream ID causes roughly 240 CAN frames of leaked stack data to be emitted onto the CAN bus.
The record
- CVE
- CVE-2026-73523
- Published
- Aug 17, 2026
- Updated
- Aug 17, 2026
- Vendor
- COVESA
- Product
- Open1722
- Classifications
- CWE-197
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 17, 2026CVE publishedPublication date reported by the CVE source.
- Aug 17, 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 <=0.9.2
What conditions does exploitation require?
What is affected?
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
- GitHub issue #154 reproduction stepsproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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