{"answers":{"affected":"6 open source packages ship an affected version, including rack. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-34830 in the wild and no public exploit code.","fix":"Upgrade rack to a fixed version for your release line: 2.2.23, 3.1.21 or 3.2.6.","what":"CVE-2026-34830 is a medium-severity path traversal vulnerability in rack, published on 2 Apr 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-2026-34830 and fix it if it is affected.\n\nWhat it is: CVE-2026-34830 is a medium-severity path traversal vulnerability in rack, published on 2 Apr 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-2026-34830 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- rack (RubyGems): affected all versions; fixed in 2.2.23\n- rack (RubyGems): affected all versions; fixed in 2.2.23\n- rack (RubyGems): affected from 3.0.0.beta1; fixed in 3.1.21\n- rack (RubyGems): affected from 3.0.0.beta1; fixed in 3.1.21\n- rack (RubyGems): affected from 3.2.0; fixed in 3.2.6\n- rack (RubyGems): affected from 3.2.0; fixed in 3.2.6\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-2026-34830/ (Markdown: https://insights.sbomify.com/CVE-2026-34830/index.md)","id":"CVE-2026-34830","markdown":"https://insights.sbomify.com/CVE-2026-34830/index.md","name":"CVE-2026-34830","record":{"aliases":["DEBIAN-CVE-2026-34830","GHSA-qv7j-4883-hwh7","MINI-2v26-hfm2-jc48","MINI-2x9j-83v7-439j","MINI-48p3-8q98-w6qq","MINI-4rqm-rwgw-ggc2","MINI-5848-6vvv-xw6j","MINI-8jr8-vqjx-6fg9","MINI-8wf6-xcf6-2w2q","MINI-c93v-9prj-jmwx","MINI-cwgc-p975-3fcr","MINI-f28v-3w79-w2h7","MINI-ghpp-cjmm-7cvv","MINI-hg24-f6hv-hh45","MINI-hj7f-phhr-hg9m","MINI-jx26-2whc-5qjh","MINI-q658-256m-6q83","MINI-q8jj-h7ch-qmvv","MINI-qm29-p4vq-wgjp","MINI-r9xf-77c9-qxqw","MINI-v5v9-wg7c-vfx3","MINI-v64q-p487-rwvf","MINI-v7w5-wqw7-v6hv","MINI-w62c-9rp2-239f","MINI-wg78-6j5g-p75v","MINI-xmwv-34p7-cgmx","UBUNTU-CVE-2026-34830"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read"],"network_reachable":"yes","non_default_config":true,"product_category":"Ruby web server interface","requires_auth":"none","summary":"Attackers can inject regex metacharacters via HTTP headers to bypass file restrictions and read arbitrary files from nginx internal locations.","user_interaction":"not_required","vuln_class":"path_traversal"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"rack","vendor":"rack"}],"cvss":{"score":5.9,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-625","name":"Permissive Regular Expression"}],"description":"Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Sendfile#map_accel_path interpolates the value of the X-Accel-Mapping request header directly into a regular expression when rewriting file paths for X-Accel-Redirect. Because the header value is not escaped, an attacker who can supply X-Accel-Mapping to the backend can inject regex metacharacters and control the generated X-Accel-Redirect response header. In deployments using Rack::Sendfile with x-accel-redirect, this can allow an attacker to cause nginx to serve unintended files from configured internal locations. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.","ecosystems":["RubyGems"],"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":"Rack: Rack::Sendfile regex injection via HTTP_X_ACCEL_MAPPING header allows arbitrary file reads through nginx","id":"CVE-2026-34830","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"RubyGems","product":null,"products":[],"type":"path_traversal","year":"2026"},"n_packages":6,"n_references":1,"next":{"headline":"Rack: Content-Length mismatch in Rack::Files error responses","id":"CVE-2026-34831"},"packages":[{"ecosystem":"RubyGems","fixed":["2.2.23"],"introduced":["0"],"last_affected":[],"package":"rack","purl":null,"source":"GHSA-qv7j-4883-hwh7"},{"ecosystem":"RubyGems","fixed":["2.2.23"],"introduced":["0"],"last_affected":[],"package":"rack","purl":"pkg:gem/rack","source":"GHSA-qv7j-4883-hwh7"},{"ecosystem":"RubyGems","fixed":["3.1.21"],"introduced":["3.0.0.beta1"],"last_affected":[],"package":"rack","purl":null,"source":"GHSA-qv7j-4883-hwh7"},{"ecosystem":"RubyGems","fixed":["3.1.21"],"introduced":["3.0.0.beta1"],"last_affected":[],"package":"rack","purl":"pkg:gem/rack","source":"GHSA-qv7j-4883-hwh7"},{"ecosystem":"RubyGems","fixed":["3.2.6"],"introduced":["3.2.0"],"last_affected":[],"package":"rack","purl":null,"source":"GHSA-qv7j-4883-hwh7"},{"ecosystem":"RubyGems","fixed":["3.2.6"],"introduced":["3.2.0"],"last_affected":[],"package":"rack","purl":"pkg:gem/rack","source":"GHSA-qv7j-4883-hwh7"}],"prev":{"headline":"Rack: Denial of Service via Unbounded Multipart File Upload Without Content-Length","id":"CVE-2026-34829"},"products":["rack"],"published":"2026-04-02","related":[{"cvss_score":7.5,"headline":"Rack: Local file inclusion in `Rack::Static` via URL Prefix Matching","id":"CVE-2026-34785","kev_date_added":null,"published":"2026-04-02"},{"cvss_score":7.5,"headline":"Rack: Algorithmic-Complexity DoS in Rack::Multipart::Parser","id":"CVE-2026-34827","kev_date_added":null,"published":"2026-04-02"},{"cvss_score":7.5,"headline":"Rack: Denial of Service via Unbounded Multipart File Upload Without Content-Length","id":"CVE-2026-34829","kev_date_added":null,"published":"2026-04-02"},{"cvss_score":7.5,"headline":"Rack has a Directory Traversal via Rack:Directory","id":"CVE-2026-22860","kev_date_added":null,"published":"2026-02-18"},{"cvss_score":7.5,"headline":"Rack is vulnerable to a memory-exhaustion DoS through unbounded URL-encoded body parsing","id":"CVE-2025-61919","kev_date_added":null,"published":"2025-10-10"},{"cvss_score":7.5,"headline":"Rack's unbounded multipart preamble buffering enables DoS (memory exhaustion)","id":"CVE-2025-61770","kev_date_added":null,"published":"2025-10-07"},{"cvss_score":7.5,"headline":"Rack's multipart parser buffers large non‑file fields entirely in memory, enabling DoS (memory exhaustion)","id":"CVE-2025-61771","kev_date_added":null,"published":"2025-10-07"}],"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":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-04-02","vendors":["rack"]},"summary":"Attackers can inject regex metacharacters via HTTP headers to bypass file restrictions and read arbitrary files from nginx internal locations.","url":"https://insights.sbomify.com/CVE-2026-34830/"}