CVE-2026-11897
IBM WebSphere Application Server Liberty is affected by a denial of service vulnerability with HTTP/2
02 Description
IBM WebSphere Application Server Liberty is affected by a denial of service vulnerability with HTTP/2
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 0.53% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 44.7% of scored records. A rank, not a probability.
- NVD base score
- 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVD analysis status
- Analyzed. NVD last modified this record on 2026-10-23.
- Red Hat severity
- No Red Hat rating. Red Hat rates the CVEs that affect its products.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-07-30 14:18Z3 MO AGO
- Last updated
- 2026-07-30 17:37Z3 MO AGO
- Reserved
- 2026-06-10
- Assigning CNA
- ibm
- Record state
- PUBLISHED
- Severity
- High (CVSS 7.5)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weaknesses
- CWE-770Allocation of Resources Without Limits or ThrottlingBase
- Data version
- 5.2
- Document digest
- f1dde5923c568fd1d9275043b36c73f5839397da8290de832b439f4088291d50
05 Affected products
06 References
07 Remediation
IBM strongly recommends addressing the vulnerability now by applying a currently available interim fix or fix pack that contains the fix for APAR PH71839. To determine if a feature is enabled for IBM WebSphere Application Server Liberty, refer to How to determine if Liberty is using a specific feature https://www.ibm.com/support/pages/node/6553910 . For IBM WebSphere Application Server Liberty 17.0.0.3 - 26.0.0.7 using the servlet-3.1, servlet-4.0, servlet-5.0, servlet-6.0, or servlet-6.1 feature(s) : · Upgrade to minimal fix pack levels as required by the interim fix and then apply the Interim Fix that resolves PH71839 https://www.ibm.com/support/pages/node/7277460 --OR-- · Apply Liberty Fix Pack 26.0.0.8 or later (targeted availability 3Q2026). Additional interim fixes may be available and linked off the interim fix download page.