{"answers":{"affected":"4 open source packages ship an affected version, including io.netty:netty-codec-xml. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-56817 in the wild and no public exploit code.","fix":"Upgrade io.netty:netty-codec-xml to a fixed version for your release line: 4.1.136.Final or 4.2.16.Final.","what":"CVE-2026-56817 is a high-severity vulnerability in Netty Netty, published on 21 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-56817 and fix it if it is affected.\n\nWhat it is: CVE-2026-56817 is a high-severity vulnerability in Netty Netty, published on 21 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-56817 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- io.netty:netty-codec-xml (Maven): affected from 4.1.0.Final; fixed in 4.1.136.Final\n- io.netty:netty-codec-xml (Maven): affected from 4.1.0.Final; fixed in 4.1.136.Final\n- io.netty:netty-codec-xml (Maven): affected from 4.2.0.Final; fixed in 4.2.16.Final\n- io.netty:netty-codec-xml (Maven): affected from 4.2.0.Final; fixed in 4.2.16.Final\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-56817/ (Markdown: https://insights.sbomify.com/CVE-2026-56817/index.md)","id":"CVE-2026-56817","markdown":"https://insights.sbomify.com/CVE-2026-56817/index.md","name":"CVE-2026-56817","record":{"aliases":["CLEANSTART-2026-LD69815","CLEANSTART-2026-TT58644","DEBIAN-CVE-2026-56817","GHSA-4qhr-g3c6-fcfx","MINI-6836-qr6v-5h8g","MINI-77v4-wpr8-2mmj","MINI-7hff-h5vr-gh8q","MINI-g962-w8j6-c6p6","MINI-jqhp-jgvq-f5fh","MINI-m4rr-742j-9pq3","MINI-p3f2-p2r8-hg2v","MINI-ph87-qfqr-577w","MINI-rhv7-xrg3-2562","MINI-v5xm-q4qg-p8j2","UBUNTU-CVE-2026-56817"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read","denial_of_service"],"network_reachable":"yes","non_default_config":true,"product_category":"Netty network framework","requires_auth":"none","summary":"Attackers can exploit XML External Entity vulnerabilities in Netty's XmlDecoder if DTD processing is enabled, potentially reading files or causing denial of service.","user_interaction":"not_required","vuln_class":"xxe"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"netty","vendor":"netty"}],"cvss":{"score":8.3,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-611","name":"Improper Restriction of XML External Entity Reference"}],"description":"Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, any caller that can deliver bytes to a Netty channel pipeline containing `XmlDecoder` can send XML with a `DOCTYPE` declaration to an `AsyncXMLInputFactory` instantiated with no security configuration, leaving DTD and entity handling active depending on Aalto XML async parser behavior and creating conditional XML external entity risk. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.","ecosystems":["Maven"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Netty: XML External Entity (XXE) injection via unconfigured XML factory when DTD and entity processing are enabled","id":"CVE-2026-56817","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":"netty:netty","products":["netty:netty"],"type":"xxe","year":"2026"},"n_packages":4,"n_references":5,"next":{"headline":"Netty: RedisArrayAggregator max-elements failure leaves retained partial aggregate state","id":"CVE-2026-56818"},"packages":[{"ecosystem":"Maven","fixed":["4.1.136.Final"],"introduced":["4.1.0.Final"],"last_affected":[],"package":"io.netty:netty-codec-xml","purl":null,"source":"GHSA-4qhr-g3c6-fcfx"},{"ecosystem":"Maven","fixed":["4.1.136.Final"],"introduced":["4.1.0.Final"],"last_affected":[],"package":"io.netty:netty-codec-xml","purl":"pkg:maven/io.netty/netty-codec-xml","source":"GHSA-4qhr-g3c6-fcfx"},{"ecosystem":"Maven","fixed":["4.2.16.Final"],"introduced":["4.2.0.Final"],"last_affected":[],"package":"io.netty:netty-codec-xml","purl":null,"source":"GHSA-4qhr-g3c6-fcfx"},{"ecosystem":"Maven","fixed":["4.2.16.Final"],"introduced":["4.2.0.Final"],"last_affected":[],"package":"io.netty:netty-codec-xml","purl":"pkg:maven/io.netty/netty-codec-xml","source":"GHSA-4qhr-g3c6-fcfx"}],"prev":{"headline":"Netty: Memory Exhaustion via HTTP/3 Reserved Frame Types","id":"CVE-2026-56816"},"products":["netty"],"published":"2026-07-21","related":[{"cvss_score":9.1,"headline":"Netty: SNI Routing Bypass via Fragmented TLS ClientHello Causing Fallback to Default SslContext","id":"CVE-2026-75595","kev_date_added":null,"published":"2026-08-19"},{"cvss_score":8.7,"headline":"Netty: Fragmented ClientHello records trigger quadratic pre-handshake reassembly in default SNI parsing","id":"CVE-2026-75596","kev_date_added":null,"published":"2026-08-19"},{"cvss_score":8.7,"headline":"Netty Bzip2Decoder: Infinite Loop in RLE State Machine Leads to Event-Loop Thread Hang","id":"CVE-2026-59901","kev_date_added":null,"published":"2026-07-29"},{"cvss_score":8.7,"headline":"Netty codec-haproxy: Signed-Byte Sentinel Collision in HAProxyMessageDecoder Leads to Unbounded Memory Exhaustion","id":"CVE-2026-55851","kev_date_added":null,"published":"2026-07-21"},{"cvss_score":8.7,"headline":"Netty SpdyHttpDecoder: ByteBuf Reference Leak on RST_STREAM Leads to Native Memory Exhaustion","id":"CVE-2026-56745","kev_date_added":null,"published":"2026-07-21"},{"cvss_score":8.7,"headline":"Netty Vulnerable to DNS Cache Poisoning via Missing Bailiwick Checks in CNAME Records","id":"CVE-2026-45674","kev_date_added":null,"published":"2026-06-12"},{"cvss_score":8.7,"headline":"Netty has Insufficient Bailiwick Validation for NS Records","id":"CVE-2026-47691","kev_date_added":null,"published":"2026-06-12"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-22","vendors":["netty"]},"summary":"Attackers can exploit XML External Entity vulnerabilities in Netty's XmlDecoder if DTD processing is enabled, potentially reading files or causing denial of service.","url":"https://insights.sbomify.com/CVE-2026-56817/"}