An update for undertow is now available for openEuler-20.03-LTS-SP4 Security Advisory openeuler-security@openeuler.org openEuler security committee openEuler-SA-2026-1431 Final 1.0 1.0 2026-02-28 Initial 2026-02-28 2026-02-28 openEuler SA Tool V1.0 2026-02-28 undertow security update An update for undertow is now available for openEuler-20.03-LTS-SP4 Java web server using non-blocking IO Security Fix(es): A flaw was found in Undertow that can cause remote denial of service attacks. When the server uses the FormEncodedDataDefinition.doParse(StreamSourceChannel) method to parse large form data encoding with application/x-www-form-urlencoded, the method will cause an OutOfMemory issue. This flaw allows unauthorized users to cause a remote denial of service (DoS) attack.(CVE-2024-3884) A flaw was found in Undertow. Servlets using a method that calls HttpServletRequestImpl.getParameterNames() can cause an OutOfMemoryError when the client sends a request with large parameter names. This issue can be exploited by an unauthorized user to cause a remote denial-of-service (DoS) attack.(CVE-2024-4027) An update for undertow is now available for openEuler-20.03-LTS-SP4. openEuler Security has rated this update as having a security impact of high. A Common Vunlnerability Scoring System(CVSS)base score,which gives a detailed severity rating, is available for each vulnerability from the CVElink(s) in the References section. High undertow https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1431 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2024-3884 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2024-4027 https://nvd.nist.gov/vuln/detail/CVE-2024-3884 https://nvd.nist.gov/vuln/detail/CVE-2024-4027 openEuler-20.03-LTS-SP4 undertow-1.4.0-10.oe2003sp4.noarch.rpm undertow-javadoc-1.4.0-10.oe2003sp4.noarch.rpm undertow-1.4.0-10.oe2003sp4.src.rpm A flaw was found in Undertow that can cause remote denial of service attacks. When the server uses the FormEncodedDataDefinition.doParse(StreamSourceChannel) method to parse large form data encoding with application/x-www-form-urlencoded, the method will cause an OutOfMemory issue. This flaw allows unauthorized users to cause a remote denial of service (DoS) attack. 2026-02-28 CVE-2024-3884 openEuler-20.03-LTS-SP4 High 7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H undertow security update 2026-02-28 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1431 A flaw was found in Undertow. Servlets using a method that calls HttpServletRequestImpl.getParameterNames() can cause an OutOfMemoryError when the client sends a request with large parameter names. This issue can be exploited by an unauthorized user to cause a remote denial-of-service (DoS) attack. 2026-02-28 CVE-2024-4027 openEuler-20.03-LTS-SP4 High 7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H undertow security update 2026-02-28 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1431