CVE-2026-110803

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Source
https://cve.org/CVERecord?id=CVE-2026-110803
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-110803.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-110803
Published
2026-10-21T18:22:59Z
Modified
2026-10-22T02:48:51Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
Session Lock Leak on an Invalid UI Id Allows Denial of Service in Vaadin Framework 8
Details

VaadinService.requestEnd() in Vaadin Framework 8 locks the session and then reads the v-uiId request parameter outside the block that releases the lock. A request carrying a non-numeric v-uiId makes Integer.parseInt throw while the session lock is held, so the lock is never released and the container thread returns to its pool still owning it. Every later request to that session then blocks forever in VaadinService.lockSession(), and repeating the request exhausts the thread pool and takes the application down. No authentication is required: a session cookie, which any client obtains with a single request, is enough. Vaadin 10 and later are not affected, because Flow releases the lock in a finally block and does not read that parameter there, and Vaadin Framework 7 is not affected either.

Users of affected versions should apply the following mitigation or upgrade. Releases that have fixed this issue include:

Product version Vaadin Framework 8.16.0 - 8.32.1

Mitigation Upgrade to 8.32.2

Vaadin Framework 7 and Vaadin 10 and later do not carry this behaviour and need no upgrade for this issue.

Artifacts Maven coordinates / Vulnerable versions / Fixed version com.vaadin:vaadin-server / 8.16.0 - 8.32.1 / >=8.32.2 com.vaadin:vaadin-server-mpr-jakarta / 8.18.0 - 8.32.1 / >=8.32.2

Database specific 
{
    "cna_assigner":  "Vaadin",
    "cwe_ids":  [
        "CWE-400",
        "CWE-667"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110803.json"
}
References

Affected packages

Git / github.com/vaadin/framework

Affected ranges

Type
GIT
Repo
https://github.com/vaadin/framework
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
eb162ee5a5c54c66aff6bcc584bac484effeb176
Introduced
15435fc0b3a10a40657b8be436e59e25e6bc8c72
Fixed
eb162ee5a5c54c66aff6bcc584bac484effeb176
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "8.16.0"
                },
                {
                    "fixed":  "8.32.2"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandardRange"
        },
        {
            "range":  [
                {
                    "introduced":  "8.18.0"
                },
                {
                    "fixed":  "8.32.2"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandardRange"
        },
        {
            "original_tag":  "8.32.2",
            "range":  [
                {
                    "fixed":  "eb162ee5a5c54c66aff6bcc584bac484effeb176"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

7.*
7.7.36
7.7.37
7.7.38
7.7.39
7.7.40
7.7.41
7.7.42
7.7.43
7.7.44
7.7.45
7.7.46
7.7.47
7.7.48
7.7.49
7.7.50
7.7.51
7.7.52
7.7.53
7.7.54
8.*
8.18.0
8.19.0
8.20.0
8.20.1
8.20.2
8.20.3
8.21.0
8.22.0
8.23.0
8.24.0
8.25.0
8.25.1
8.25.2
8.26.0
8.27.0
8.27.1
8.27.2
8.27.3
8.27.4
8.27.5
8.27.6
8.27.7
8.28.0
8.28.1
8.28.2
8.28.4
8.29.0
8.30.0
8.30.1
8.31.0
8.31.1
8.32.0
8.32.1
Other
untagged-b0e3ac634e7094c3c87e

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-110803.json"