Full Report
The title of the post is”What AI Security Research Looks Like When It Works,” and I agree: In the latest OpenSSL security release> on January 27, 2026, twelve new zero-day vulnerabilities (meaning unknown to the maintainers at time of disclosure) were announced. Our AI system is responsible for the original discovery of all twelve, each found and responsibly disclosed to the OpenSSL team during the fall and winter of 2025. Of those, 10 were assigned CVE-2025 identifiers and 2 received CVE-2026 identifiers. Adding the 10 to the three we already found in the ...
Analysis Summary
# Vulnerability: Critical Stack Buffer Overflow in OpenSSL CMS Parsing
## CVE Details
- **CVE ID**: CVE-2025-15467 (Primary focus of the report)
- **CVSS Score**: 9.8 (Critical)
- **CWE**: CWE-121 (Stack-based Buffer Overflow)
*Note: The report mentions 11 additional CVEs—10 with CVE-2025 identifiers and 2 with CVE-2026 identifiers—all discovered by the AISLE AI system.*
## Affected Systems
- **Products**: OpenSSL
- **Versions**: Affects current versions prior to the January 27, 2026 release. Some underlying flaws have persisted since 1998-2000 (SSLeay era).
- **Configurations**: Systems utilizing Cryptographic Message Syntax (CMS) message parsing.
## Vulnerability Description
CVE-2025-15467 is a stack buffer overflow occurring within the OpenSSL CMS (Cryptographic Message Syntax) parsing logic. The flaw allows for a memory corruption event when processing specifically crafted CMS messages. Notably, the vulnerability exists in deep-seated code that has been present for over 25 years, predating the formal creation of the OpenSSL project.
## Exploitation
- **Status**: PoC available. Exploits have been "quickly developed online" following the disclosure.
- **Complexity**: Low (Potentially exploitable without valid key material).
- **Attack Vector**: Network (Remote).
## Impact
- **Confidentiality**: High (Potential for memory leakage or unauthorized access).
- **Integrity**: High (Potential for code execution or modification of data).
- **Availability**: High (Potential for application crash or system takeover).
## Remediation
### Patches
- Users must update to the **OpenSSL security release dated January 27, 2026**.
- Five of the twelve vulnerabilities, including the primary fix for the stack overflow, utilized patches directly proposed by the AISLE AI system.
### Workarounds
- Disable or restrict the parsing of CMS messages if not mission-critical.
- Implement strict ingress filtering for untrusted cryptographic messages at the network perimeter.
## Detection
- **Indicators of Compromise**: Monitor for unusual application crashes in services utilizing OpenSSL's CMS functions (e.g., S/MIME processing).
- **Detection methods and tools**:
- Utilize vulnerability scanners updated with the January 2026 OpenSSL definitions.
- Monitor for public exploit signatures targeting OpenSSL CMS parsing.
## References
- **Vendor Advisory**: hxxps[://]openssl-library[.]org/news/vulnerabilities/
- **Research Deep Dive**: hxxps[://]aisle[.]com/blog/openssl-stack-overflow-cve-2025-15467-deep-dive
- **NVD Entry**: hxxps[://]nvd[.]nist[.]gov/vuln/detail/CVE-2025-15467
- **Secondary Source**: hxxps[://]www[.]schneier[.]com/blog/archives/2026/02/ai-found-twelve-new-vulnerabilities-in-openssl[.]html