{"answers":{"affected":"4 open source packages ship an affected version, including io.netty:netty-codec-http. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-59903 in the wild and no public exploit code.","fix":"Upgrade io.netty:netty-codec-http to a fixed version for your release line: 4.1.137.Final or 4.2.17.Final.","what":"CVE-2026-59903 is a medium-severity vulnerability in Netty Netty, published on 17 Aug 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-2026-59903 and fix it if it is affected.\n\nWhat it is: CVE-2026-59903 is a medium-severity vulnerability in Netty Netty, published on 17 Aug 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-2026-59903 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- io.netty:netty-codec-http (Maven): affected all versions; fixed in 4.1.137.Final\n- io.netty:netty-codec-http (Maven): affected all versions; fixed in 4.1.137.Final\n- io.netty:netty-codec-http (Maven): affected from 4.2.0.Final; fixed in 4.2.17.Final\n- io.netty:netty-codec-http (Maven): affected from 4.2.0.Final; fixed in 4.2.17.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-2026-59903/ (Markdown: https://insights.sbomify.com/CVE-2026-59903/index.md)","id":"CVE-2026-59903","markdown":"https://insights.sbomify.com/CVE-2026-59903/index.md","name":"CVE-2026-59903","record":{"aliases":["CLEANSTART-2026-FH63085","CLEANSTART-2026-HJ08355","CLEANSTART-2026-HK72539","CLEANSTART-2026-PK10148","CLEANSTART-2026-UV29003","CLEANSTART-2026-VW00414","CLEANSTART-2026-ZN73340","DEBIAN-CVE-2026-59903","ECHO-576a-1a44-9b4d","GHSA-8c42-7qj2-3j46","MINI-2m6c-ww2c-mx56","MINI-2mf6-wrr6-64rj","MINI-37gg-24rh-p6p9","MINI-388j-rw88-r32j","MINI-3c3j-gf46-3rr9","MINI-3gm9-672w-3fp4","MINI-3h86-vm7p-8658","MINI-3m9h-jq6c-rpxj","MINI-3vrp-7hxc-3844","MINI-42j9-rcx4-2mmw","MINI-4g4f-xj24-rm97","MINI-4ghh-8phv-27g6","MINI-4pqc-4fff-7vjq","MINI-4xhg-f9r8-4mc3","MINI-533m-f29p-747c","MINI-54v7-jprv-25gc","MINI-58cm-f897-c954","MINI-5ccw-79gx-v6hr","MINI-5cr5-jjr8-gjf3","MINI-5hx6-rm9p-2mm8","MINI-5v8h-mwrj-5p6c","MINI-6g3p-qh9r-xp57","MINI-6qr2-7jqf-rxvm","MINI-6w9p-jcxx-qvpr","MINI-7242-3w27-r2wv","MINI-73j6-4h8f-mvp3","MINI-7gwx-c7xj-3jvm","MINI-7jpj-7xhv-3q4m","MINI-7pcc-qch4-5269","MINI-7qwv-cfhc-j56q","MINI-7vm8-jprp-73m7","MINI-7wrq-vf36-g468","MINI-7x9v-xhv4-h6mm","MINI-7xmf-rx2m-hcmv","MINI-88xx-849c-6wh6","MINI-8938-8wxv-jrhq","MINI-8fqp-r4qw-6vg7","MINI-8qcw-9454-jmvj","MINI-98cm-59vr-gcm4","MINI-9j82-jq86-x6cc","MINI-9p97-f4pq-qxpv","MINI-9wpj-2gmh-66v3","MINI-c4q8-m5pq-ch4q","MINI-c6gc-j6ch-w5hv","MINI-cg3x-4fqc-j2v2","MINI-chrx-7fcr-5xcx","MINI-cp57-6gvw-w559","MINI-cw6w-m5m3-jcx5","MINI-fgm7-wf8m-42gv","MINI-frhp-3wgp-jp6r","MINI-g8gf-f59c-h6vj","MINI-g9xw-6272-rf5v","MINI-gcpx-5r6q-w5hg","MINI-gcv3-8ww5-f4xp","MINI-ghxv-8393-6grr","MINI-gmm9-5fc5-cjxm","MINI-h65r-r5x4-r88v","MINI-hp26-vvgw-x6fh","MINI-j23r-9jp9-vmcf","MINI-j6fj-65mx-w6h9","MINI-jcq4-cq7h-96g7","MINI-jmj2-78xm-4v9p","MINI-m5vr-cqfq-6pw5","MINI-m8g2-745q-5648","MINI-mfv5-c94v-vc9h","MINI-mfv8-89r4-45f7","MINI-mpww-hrph-3vc3","MINI-mq5g-r9m3-xcvp","MINI-mqhm-f7cp-r355","MINI-pc67-g3v8-f6gc","MINI-phrg-gp2j-c959","MINI-q3gf-ff2m-xv5m","MINI-q62f-gw5c-hc95","MINI-q8c3-8fp3-v2q6","MINI-q8q2-f572-p275","MINI-q8xj-g588-vw2m","MINI-qjm2-h3fp-xcm8","MINI-qw42-h497-vpx9","MINI-qx2w-8432-cwmw","MINI-r44x-v8c2-ghgq","MINI-r53h-497m-qvc3","MINI-r5vj-vvmw-5665","MINI-r9f3-jvrg-33v3","MINI-r9v2-758h-q9p9","MINI-rp48-p8hr-qrr6","MINI-rv29-v4vp-5qwx","MINI-rx36-wfh7-rqch","MINI-v93q-239f-4v4p","MINI-vfp2-x4gf-mv3w","MINI-vg63-gj56-4xq6","MINI-vwm2-v984-jh3j","MINI-vxg9-9xw9-xgcp","MINI-w2r7-8ch8-w9hh","MINI-wc7m-f4p6-749g","MINI-wv69-f5xh-4q4q","MINI-wvmc-w72m-3x4q","MINI-wwrq-qrf6-w975","MINI-wxgp-7682-7r7f","MINI-x4rr-4v63-qmr3","MINI-xcv7-7pgj-5cw9","MINI-xj85-gf2c-jvv5","MINI-xpc3-37h9-8hq8","MINI-xr6h-p2mx-2qv4","UBUNTU-CVE-2026-59903"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Java network framework","requires_auth":"none","summary":"Netty's CORS handler overwrites Vary headers, enabling cache poisoning and disclosure of authenticated responses to other users.","user_interaction":"not_required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"netty","vendor":"netty"}],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-524","name":"Use of Cache Containing Sensitive Information"}],"description":"Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, io.netty.handler.codec.http.cors.CorsHandler setVaryHeader replaces application Vary headers such as Authorization or Cookie with Origin, allowing a caching proxy or CDN to reuse authenticated responses across users and disclose sensitive information. This issue is fixed in versions 4.1.137.Final and 4.2.17.Final.","ecosystems":["Maven"],"exploits":{"exploitdb":0,"first_seen":"2026-09-08","github_poc":1,"max_poc_stars":0,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-09-08T14:17:27Z","kind":"github_poc","ref":"https://github.com/xiaoqiMikko/netty-http-check","stars":0,"title":"CVE-2026-59903 / CVE-2026-33870: offline checker for io.netty:netty-codec-http - its 14 CVEs plus 9 advisories Netty published on 2026-09-10 that the GitHub Advisory Database (Dependabot) does not list. 4.1.137.Final / 4.2.17.Final is no longer enough; upgrade to 4.1.138.Final / 4.2.18.Final."}],"tier":"poc_unverified"},"has_fix":true,"headline":"Netty: Cache Poisoning and Information Disclosure via CORS Vary Header Overwrite","id":"CVE-2026-59903","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":"netty:netty","products":["netty:netty"],"type":"information_disclosure","year":"2026"},"n_packages":4,"n_references":5,"next":{"headline":"Path traversal in ObjectScale","id":"CVE-2026-59909"},"packages":[{"ecosystem":"Maven","fixed":["4.1.137.Final"],"introduced":["0"],"last_affected":[],"package":"io.netty:netty-codec-http","purl":null,"source":"GHSA-8c42-7qj2-3j46"},{"ecosystem":"Maven","fixed":["4.1.137.Final"],"introduced":["0"],"last_affected":[],"package":"io.netty:netty-codec-http","purl":"pkg:maven/io.netty/netty-codec-http","source":"GHSA-8c42-7qj2-3j46"},{"ecosystem":"Maven","fixed":["4.2.17.Final"],"introduced":["4.2.0.Final"],"last_affected":[],"package":"io.netty:netty-codec-http","purl":null,"source":"GHSA-8c42-7qj2-3j46"},{"ecosystem":"Maven","fixed":["4.2.17.Final"],"introduced":["4.2.0.Final"],"last_affected":[],"package":"io.netty:netty-codec-http","purl":"pkg:maven/io.netty/netty-codec-http","source":"GHSA-8c42-7qj2-3j46"}],"prev":{"headline":"Netty: Memory Exhaustion in SctpMessageCompletionHandler","id":"CVE-2026-59902"},"products":["netty"],"published":"2026-08-17","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)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-17","vendors":["netty"]},"summary":"Netty's CORS handler overwrites Vary headers, enabling cache poisoning and disclosure of authenticated responses to other users.","url":"https://insights.sbomify.com/CVE-2026-59903/"}