{"answers":{"affected":"3 open source packages ship an affected version, including github.com/quic-go/webtransport-go. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-21438 in the wild and no public exploit code.","fix":"Upgrade github.com/quic-go/webtransport-go to 0.10.0 or later.","what":"CVE-2026-21438 is a medium-severity denial of service vulnerability in quic-go webtransport-go, published on 12 Feb 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-2026-21438 and fix it if it is affected.\n\nWhat it is: CVE-2026-21438 is a medium-severity denial of service vulnerability in quic-go webtransport-go, published on 12 Feb 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-2026-21438 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/quic-go/webtransport-go (Go): affected all versions; fixed in 0.10.0\n- github.com/quic-go/webtransport-go (Go): affected all versions; fixed in 0.10.0\n- github.com/quic-go/webtransport-go (Go): affected all versions; fixed in 0.10.0\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-2026-21438/ (Markdown: https://insights.sbomify.com/CVE-2026-21438/index.md)","id":"CVE-2026-21438","markdown":"https://insights.sbomify.com/CVE-2026-21438/index.md","name":"CVE-2026-21438","record":{"aliases":["GHSA-2f2x-8mwp-p2gc","GO-2026-4483","MINI-5cj6-55r7-xgw5","MINI-p475-v953-fhcq"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Go WebTransport library","requires_auth":"none","summary":"An attacker can cause unbounded memory consumption and denial of service by repeatedly creating and closing WebTransport streams in webtransport-go.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"webtransport-go","vendor":"quic-go"}],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-459","name":"Incomplete Cleanup"},{"id":"CWE-401","name":"Missing Release of Memory after Effective Lifetime"}],"description":"webtransport-go is an implementation of the WebTransport protocol. Prior to 0.10.0, an attacker can cause unbounded memory consumption repeatedly creating and closing many WebTransport streams. Closed streams were not removed from an internal session map, preventing garbage collection of their resources. This vulnerability is fixed in v0.10.0.","ecosystems":["Go"],"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":"webtransport-go affected by a Memory Exhaustion Attack due to Missing Cleanup of Streams Map","id":"CVE-2026-21438","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":2,"next":{"headline":"badkeys vulnerable to ASCII control character injection on console via malformed input","id":"CVE-2026-21439"},"packages":[{"ecosystem":"Go","fixed":["0.10.0"],"introduced":["0"],"last_affected":[],"package":"github.com/quic-go/webtransport-go","purl":null,"source":"GHSA-2f2x-8mwp-p2gc"},{"ecosystem":"Go","fixed":["0.10.0"],"introduced":["0"],"last_affected":[],"package":"github.com/quic-go/webtransport-go","purl":"pkg:golang/github.com/quic-go/webtransport-go","source":"GHSA-2f2x-8mwp-p2gc"},{"ecosystem":"Go","fixed":["0.10.0"],"introduced":["0"],"last_affected":[],"package":"github.com/quic-go/webtransport-go","purl":"pkg:golang/github.com/quic-go/webtransport-go","source":"GO-2026-4483"}],"prev":{"headline":"eopkg vulnerable to package file list integrity bypass","id":"CVE-2026-21437"},"products":["webtransport-go"],"published":"2026-02-12","related":[{"cvss_score":5.3,"headline":"webtransport-go affected by Memory Exhaustion Attack due to Missing Length Check in WT_CLOSE_SESSION Capsule","id":"CVE-2026-21434","kev_date_added":null,"published":"2026-02-12"},{"cvss_score":5.3,"headline":"webtransport-go CloseWithError can block indefinitely","id":"CVE-2026-21435","kev_date_added":null,"published":"2026-02-12"}],"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":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"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":"2026-02-17","vendors":["quic-go"]},"summary":"An attacker can cause unbounded memory consumption and denial of service by repeatedly creating and closing WebTransport streams in webtransport-go.","url":"https://insights.sbomify.com/CVE-2026-21438/"}