{"schemaVersion":3,"id":"CVE-2026-89044","aliases":["UBUNTU-CVE-2026-89044","DEBIAN-CVE-2026-89044","CGA-73m3-m97w-hjpg","CGA-pmjp-p66v-529g"],"status":"published","duplicateOf":null,"title":null,"description":"Netty versions 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final fail to properly validate the final transfer coding in the Transfer-Encoding header, allowing attackers to smuggle requests by using malformed encoding declarations. Attackers can split Transfer-Encoding headers across multiple lines or use values like 'chunked, xchunked' to bypass validation and decode messages as chunked when the final coding is not chunked, enabling request smuggling attacks.","dates":{"published":"2026-09-10T17:39:34.162Z","modified":"2026-09-18T17:23:07.234Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":6.9,"severity":"medium","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":6.9,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":6.5,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Ubuntu","score":6.9,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":6.5,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","exploitability":10,"impact":4.2,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Debian","score":6.9,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","exploitability":null,"impact":null,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Chainguard","score":6.9,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":6.9,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":6.5,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00284,"percentile":0.19669,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0.04100000000000002,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.00243},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00247,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00247,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00247,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00243,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00243,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00243,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00243,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00243,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00243,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00243,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00426,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00426,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00426,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00426,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00426,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00426,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00426,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00426,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00284,"percentile":0.19669}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.00243,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00243,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00243,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00243,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00243,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00426,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00426,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00426,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00426,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00426,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00426,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00426,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00426,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00284,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00284,"percentile":0.19669}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[{"id":"GITHUB_NETTY_NETTY","name":"Netty","source":"github","url":"https://github.com/netty/netty/issues/2562","maturity":"poc","reliabilityScore":0.3,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-444","name":"Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","description":"The product acts as an intermediary HTTP agent\n         (such as a proxy or firewall) in the data flow between two\n         entities such as a client and server, but it does not\n         interpret malformed HTTP requests or responses in ways that\n         are consistent with how the messages will be processed by\n         those entities that are at the ultimate destination.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/444.html"}],"affected":[{"vendor":"chainguard","product":"keycloak-fips-26.7-iamguarded-fips","name":"keycloak-fips-26.7-iamguarded-fips","label":"keycloak-fips-26.7-iamguarded-fips","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/keycloak-fips-26.7-iamguarded-fips","purlType":"apk","versions":[{"text":"< 26.7.4-r3","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 26.7.4-r3","eol":null,"hubHref":null},{"vendor":"debian","product":"netty","name":"netty","label":"netty","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/netty","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"netty","name":"netty","label":"netty","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/netty","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"netty","product":"netty","name":"netty","label":"netty","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 4.1.133.Final, < 4.1.138.Final","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.2.13.Final, < 4.2.18.Final","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.1.133, < 4.1.138","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.2.13, < 4.2.18","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 4.1.133.Final, < 4.1.138.Final | ≥ 4.2.13.Final, < 4.2.18.Final | ≥ 4.1.133, < 4.1.138 | ≥ 4.2.13, < 4.2.18","eol":null,"hubHref":"/vendor/netty/netty"}],"affectedCount":4,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/netty/netty/security/advisories/GHSA-hcvj-94mj-jp5c","label":"github.com/netty/netty/security/advisories/GHSA-hcvj-94mj-jp5c","hostname":"github.com","tags":["Vendor Advisory","REPORT","Advisory","Exploit"]},{"url":"https://github.com/netty/netty/commit/ca87393b0e9e13c493d213a268e727a6d44e1585","label":"github.com/netty/netty/commit/ca87393b0e9e13c493d213a268e727a6d44e1585","hostname":"github.com","tags":["Patch","FIX"]},{"url":"https://github.com/netty/netty/commit/640d4d3324f7b811a4903d0730c8ccb35500500c","label":"github.com/netty/netty/commit/640d4d3324f7b811a4903d0730c8ccb35500500c","hostname":"github.com","tags":["Patch","FIX"]},{"url":"https://github.com/netty/netty/blob/netty-4.1.137.Final/codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java#L866","label":"github.com/netty/…","hostname":"github.com","tags":["Technical Description","ARTICLE","Product"]},{"url":"https://github.com/netty/netty/releases/tag/netty-4.1.138.Final","label":"github.com/netty/netty/releases/tag/netty-4.1.138.Final","hostname":"github.com","tags":["Release Notes","Advisory"]},{"url":"https://github.com/netty/netty/releases/tag/netty-4.2.18.Final","label":"github.com/netty/netty/releases/tag/netty-4.2.18.Final","hostname":"github.com","tags":["Release Notes","Advisory"]},{"url":"https://github.com/netty/netty","label":"github.com/netty/netty","hostname":"github.com","tags":["Product","PACKAGE"]},{"url":"https://www.vulncheck.com/advisories/netty-4.1.133-final-through-4.1.137-final-and-4.2.13-final-through-4.2.17-final-http-request-smuggling-via-transfer-encoding","label":"www.vulncheck.com/advisories/…","hostname":"www.vulncheck.com","tags":["Third Party Advisory","Advisory","Patch"]},{"url":"https://ubuntu.com/security/CVE-2026-89044","label":"ubuntu.com/security/CVE-2026-89044","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89044","label":"www.cve.org/CVERecord?id=CVE-2026-89044","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-89044","label":"security-tracker.debian.org/tracker/CVE-2026-89044","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://repo1.maven.org/maven2/io/netty/netty-codec-http/","label":"repo1.maven.org/maven2/io/netty/netty-codec-http/","hostname":"repo1.maven.org","tags":["WEB"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89044.json","label":"github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89044.json","hostname":"github.com","tags":["Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89044","label":"nvd.nist.gov/vuln/detail/CVE-2026-89044","hostname":"nvd.nist.gov","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2026:11882-1","SUSE-SU-2026:4391-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:11882-1","SUSE-SU-2026:4391-1"]},"timeline":[{"kind":"published","date":"2026-09-10T17:39:34.162Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-18T17:23:07.234Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":38,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T21:32:37.837Z","stale":false,"partial":false}}