Memory disclosure via unsound OwnedView lifetime promotion
Published Jul 16, 2026 · Updated Jul 16, 2026
Use-after-free in Anthropic buffa before 0.7.0 allows local users to disclose freed heap contents through dangling view references. OwnedView::decode promotes its backing slice to a synthetic static lifetime, while Deref exposes borrowed fields without tying their lifetime to the handle. Exploitation requires application code to retain a field reference after dropping OwnedView, leaving a dangling pointer that permits freed-memory disclosure and memory corruption.
Summary
What happened
Use-after-free in Anthropic buffa before 0.7.0 allows local users to disclose freed heap contents through dangling view references. OwnedView::decode promotes its backing slice to a synthetic static lifetime, while Deref exposes borrowed fields without tying their lifetime to the handle. Exploitation requires application code to retain a field reference after dropping OwnedView, leaving a dangling pointer that permits freed-memory disclosure and memory corruption.
The record
- CVE
- CVE-2026-55406
- Published
- Jul 16, 2026
- Updated
- Jul 16, 2026
- Vendor
- Anthropic
- Product
- buffa
- Classifications
- CWE-200, CWE-416
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 16, 2026CVE publishedPublication date reported by the CVE source.
- Jul 16, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 0.7.0
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
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo