Out-of-bounds read via oversized callback length
Published Apr 24, 2026 · Updated Apr 24, 2026
Out-of-bounds read in rust-openssl openssl 0.9.0 through 0.10.77 allows remote attackers to read memory during PEM key loading. The *_from_pem_callback APIs trust the byte count returned by an application password callback and pass an oversized length to OpenSSL, which reads beyond the callback buffer. Exposure requires a consuming application to use an affected callback with a pre-3.x OpenSSL release; bounded effects include adjacent-memory disclosure and a service crash.
Summary
What happened
Out-of-bounds read in rust-openssl openssl 0.9.0 through 0.10.77 allows remote attackers to read memory during PEM key loading. The *_from_pem_callback APIs trust the byte count returned by an application password callback and pass an oversized length to OpenSSL, which reads beyond the callback buffer. Exposure requires a consuming application to use an affected callback with a pre-3.x OpenSSL release; bounded effects include adjacent-memory disclosure and a service crash.
The record
- CVE
- CVE-2026-41677
- Published
- Apr 24, 2026
- Updated
- Apr 24, 2026
- Vendor
- rust-openssl
- Product
- openssl
- Classifications
- CWE-1284, CWE-125
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 24, 2026CVE publishedPublication date reported by the CVE source.
- Apr 24, 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=>= 0.9.0, < 0.10.78
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