Anthropic OSS Scanner Uncovers 29,439 Vulnerability Candidates in Open Source Projects, Delivering 6,157 Reports and 516 Fixes
Anthropic has released comprehensive statistics from its coordinated vulnerability disclosure program, revealing how its models processed nearly thirty thousand vulnerability candidates before the public launch of the OSS Scanner service on 8 October 2026.
The dashboard snapshot taken on 2 October shows that models generated 29,439 candidate vulnerabilities. External security firms reviewed 6,123 of them (20.8 percent) and confirmed 5,674 as real issues, achieving a 92.7 percent confirmation rate among reviewed candidates. The remaining 23,316 candidates have not yet received independent verification.
Reports delivered to maintainers
Of the 6,157 reports sent to 591 open-source projects, 1,333 (21.6 percent) passed through external firm triage while 4,824 (78.4 percent) were delivered directly without the same level of human review. Maintainers responded to 5,103 reports, yet only 516 fixes (8.4 percent) have been merged upstream so far. Anthropic notes that the “fixed” counter reflects only changes known to the company and may undercount actual patches.
Why remediation lags behind discovery
- Patches take time; a September report may result in a November release that the 2 October snapshot does not capture.
- Many confirmed issues fall into “won’t fix” categories because they lie outside the project’s threat model or are unreachable in realistic scenarios.
- Even verified reports require maintainers to write tests, perform backports and evaluate behavioural changes before merging.
Claude Mythos reports now include self-contained reproducers, commit bisects and candidate patches when the model can generate them. The service runs inside isolated virtual machines with no internet access and is available only to projects that meet strict infrastructure and user-safety criteria.
Feedback published by Anthropic includes positive comments from maintainers of PostgreSQL, curl, OpenSSL, wolfSSL and HotCRP. On the academic CyberGym benchmark, the share of correctly identified vulnerabilities rose from under 20 percent to over 85 percent within a year. A small-scale review of 97 high- and critical-severity findings showed an 88 percent pass rate through the disclosure process.
The company acknowledges that some reports still overstate severity or misalign with individual project threat models. External firms agreed with Claude’s severity ratings exactly in 83 percent of cases and within one level in 97.1 percent of triaged reports.
Related articles
Palo Alto Networks Discloses Seven PAN-OS Vulnerabilities Including One Already Exploited in the Wild
Palo Alto Networks has published seven security advisories addressing vulnerabilities in its PAN-OS operating system used on PA-series and VM-series firewalls as well as the Panorama management platform. One flaw tracked as CVE-2026-0322 allows authenticated remote code execution with root privileges through the management interface and has already been observed in limited exploitation attempts. The company rated the issue with a CVSS v4.0 base score of 8.6 and assigned it the highest remediation priority. Four additional medium-severity issues and two low-severity issues were also fixed in the same set of advisories. Products such as Cloud NGFW and Prisma Access are confirmed to be unaffected. Palo Alto Networks urges immediate patching for all impacted PAN-OS deployments.
Critical Vulnerability CVE-2026-76519 in Cisco Secure Email Gateway Allows Arbitrary File Writes Without Authentication
Cisco Systems has disclosed a critical vulnerability in its Cisco Secure Email Gateway product that affects the Advanced Malware Protection feature responsible for processing email attachments. The flaw, tracked as CVE-2026-76519, permits unauthenticated attackers to write arbitrary files to the underlying operating system by sending a specially crafted email attachment. Successful exploitation can lead to remote command execution with root privileges. The vulnerability received a CVSS v3.1 base score of 9.8 and is rated Critical. Cisco confirmed active exploitation of the issue in October 2026, shortly after publishing the security advisory on October 14, 2026. This marks the second publicly disclosed exploited vulnerability in the product within a short period, though the flaws are unrelated.
Cyberattack Exploits Exposed Danfoss Refrigeration Controllers Across French Supermarkets
A remote cyberattack targeted Danfoss AK-SM 8xxA Series controllers in French supermarkets, allowing attackers to manipulate refrigeration parameters and trigger defrost cycles that raised temperatures and spoiled food stock. The incident impacted an estimated 250 to 350 stores belonging to major chains including Intermarché, Carrefour Market, Leclerc, and others. Paris prosecutors have opened a large-scale investigation into the attack and associated damages, including potential fires. The root cause traces to outdated software on internet-exposed OT management interfaces, with multiple CVEs enabling authentication bypass and remote code execution. Thousands of similar Danfoss systems remain publicly accessible worldwide, highlighting persistent OT exposure risks. Immediate remediation steps include closing web consoles, enforcing VPN access, and applying updates to versions 4.2 and 4.3.1 or later.
Three Zero-Days Chained in Ivanti Connect Secure Grant Root Access Without Login
An attacker chained three zero-day vulnerabilities in Ivanti Connect Secure to execute commands as root without authentication. The compromised appliance was running the fully patched version 22.8R2.4 when exploitation began on October 3. Volexity discovered the intrusion, attributed the activity to UTA0576 with low confidence in criminal rather than espionage motives, and reported the flaws to the vendor. Ivanti acknowledged limited in-the-wild exploitation on October 13. The first two issues, an authentication bypass and remote code execution, were combined under CVE-2026-104935 with a CVSS score of 8.6, allowing code execution as the cgi-server user. A third privilege-escalation flaw then elevated access to root. The final flaw lacked a patch at disclosure time, with a fix promised in an upcoming release. CISA classified the exploitation as active with total technical impact.