CISA Adds Three Known Exploited Vulnerabilities to Catalog
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
CISA has added three new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation. CVE-2026-9198 IBM Langflow Code Injection Vulnerability CVE-2026-18556 N-able N-central Authentication Bypass Using an Alternate Path or Channel Vulnerability CVE-2026-34486 Apache Tomcat Missing Encryption of Sensitive Data Vulnerability These types of vulnerabilities are a frequent attack vector for malicious cyber actors and pose significant risks to the federal enterprise. Binding Operational Directive (BOD) 26-04: Prioritizing Security Updates Based on Risk establishes vulnerability management requirements for Federal Civilian Executive Branch (FCEB) agencies. BOD 26-04 reinforces the importance of the KEV Catalog and requires federal agencies to prioritize rapid remediation of high-risk vulnerabilities, specifically those identified by Common Vulnerabilities and Exposures (CVEs) listed in CISA’s KEV Catalog on publicly exposed assets that grant total control of the asset post-exploitation, while deferring action for lower-risk vulnerabilities. BOD 26-04 further establishes basic expectations for when agencies must check whether threat actors compromised the system before the patch was applied. While BOD 26-04 applies only to FCEB agencies, CISA encourages all organizations to adopt risk-based vulnerability management and prioritize remediation of KEV Catalog vulnerabilities . CISA will continue to add vulnerabilities to the catalog that meet the specified criteria . Aware of an exploited vulnerability not currently listed in the KEV Catalog? Submit it for potential addition through CISA’s KEV Nomination Form . Potential KEV additions must have a CVE ID, evidence of exploitation, and clear mitigation guidance.
CSIRTS triage
- What
- CISA notification of three actively exploited vulnerabilities: IBM Langflow code injection, N-able N-central authentication bypass, and Apache Tomcat missing encryption.
- Who is affected
- Organizations deploying IBM Langflow, N-able N-central, or Apache Tomcat at affected versions.
- Urgency
- Critical — all three vulnerabilities are actively exploited with high impact; CISA BOD 26-04 requires federal agencies to prioritize remediation.
- Action
- Identify and patch all instances of affected products: IBM Langflow (CVE-2026-9198), N-able N-central (CVE-2026-18556), and Apache Tomcat (CVE-2026-34486).
AI-assisted analysis generated from the source advisory — verify against the original.
Details
Original advisory: https://www.cisa.gov/news-events/alerts/2026/08/04/cisa-adds-three-known-exploited-vulnerabilities-catalog
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Exploitation confirmedCVE-2026-9198Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 97% of all EPSS-scored CVEs.
- Exploitation confirmedCVE-2026-18556Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 40% of all EPSS-scored CVEs.
- Exploitation confirmedCVE-2026-34486Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99.7% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-9198 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-18556 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-34486 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- highexploited[UPDATE] [medium] Apache Tomcat and Tomcat Native: Multiple vulnerabilitiescert-bund
- highexploited[UPDATE] [high] Atlassian Bamboo, Bitbucket, Confluence, Fisheye, Crucible, Jira and Jira Service Management: …cert-bund
- unknownexploitedN-able security advisory (AV26-769) - Update 2cccs
- unknownexploitedNCSC-2026-0275 [1.01] [M/H] Vulnerabilities patched in N-able N-centralncsc-nl
- criticalexploited[NEW] [high] IBM Langflow Desktop OSS: Multiple vulnerabilitiescert-bund
- unknownexploitedApache Tomcat Multiple Vulnerabilitieshkcert
- unknownexploitedIBM security advisory (AV26-770)cccs
- criticalexploitedCVE-2026-9198: IBM Langflow Code Injection Vulnerabilitycisa-kev
- criticalexploitedCVE-2026-18556: N-able N-central Authentication Bypass Using an Alternate Path or Channel Vulnerabilitycisa-kev
- criticalexploitedCVE-2026-34486: Apache Tomcat Missing Encryption of Sensitive Data Vulnerabilitycisa-kev
- medium[NEW] [medium] N-able N-Central: Multiple vulnerabilities enable bypassing security measurescert-bund
- unknownexploitedNCSC-2026-0275 [1.00] [M/H] Vulnerabilities patched in N-able N-centralncsc-nl
Recent advisories for CISA Adds Three
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- highexploitedCISA Adds Three Known Exploited Vulnerabilities to Catalogcisa · 2026-08-27
- highexploitedCISA Adds Three Known Exploited Vulnerabilities to Catalogcisa · 2026-08-11
- highexploitedCISA Adds Three Known Exploited Vulnerabilities to Catalogcisa · 2026-07-16
- highexploitedCISA Adds Three Known Exploited Vulnerabilities to Catalogcisa · 2026-07-07
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