{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-123828 in the wild and no public exploit code.","exposure":"An affected version is only exploitable if your software calls Http2Session.altsvc(). Many projects that include it are not exposed.","fix":"No fix published yet.","what":"CVE-2026-123828 is a medium-severity memory corruption vulnerability in nodejs node, published on 11 Nov 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-2026-123828 and fix it if it is affected.\n\nWhat it is: CVE-2026-123828 is a medium-severity memory corruption vulnerability in nodejs node, published on 11 Nov 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-2026-123828 in the wild and no public exploit code.\nExposure: An affected version is only exploitable if your software calls Http2Session.altsvc(). Many projects that include it are not exposed.\n\nAffected product: nodejs node. No package-level version data is available, so check the vendor advisory linked from the reference page.\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.\n   If an affected version is present, also search the code for calls to Http2Session.altsvc() and report whether any exist.\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-2026-123828/ (Markdown: https://insights.sbomify.com/CVE-2026-123828/index.md)","id":"CVE-2026-123828","markdown":"https://insights.sbomify.com/CVE-2026-123828/index.md","name":"CVE-2026-123828","record":{"aliases":["ALPINE-CVE-2026-123828","BELL-CVE-2026-123828","DEBIAN-CVE-2026-123828","GHSA-5pfh-35r8-498j","UBUNTU-CVE-2026-123828"],"analysis":{"component_type":"library","exploitable_when_present":false,"fix_type":"no_fix_stated","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"JavaScript runtime","requires_auth":"none","requires_specific_call":true,"summary":"Remote attackers can send a long :authority header to Node.js HTTP/2 apps passing it to Alt-Svc, corrupting heap memory and crashing the process.","user_interaction":"not_required","vuln_class":"memory_corruption","vulnerable_functions":["Http2Session.altsvc()"]},"analysis_generated_by":"sbomify/insights-2b-fp8","assigner":"openjs","cpe":[],"cvss":{"score":5.9,"severity":"medium","source":"cna","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.0"},"cwes":[{"id":"CWE-122","name":"Heap-based Buffer Overflow"}],"description":"A one-byte heap buffer overflow in Node.js HTTP/2 Alt-Svc handling lets a remote, unauthenticated attacker corrupt process memory. When an application passes an attacker-controlled value such as a request's :authority header to Http2Session.altsvc(), the AltSvc implementation in src/node_http2.cc allocates a buffer sized to the origin length and then writes it with a null terminator, placing one byte past the end of the allocation. A single request carrying a long but syntactically valid :authority triggers the out-of-bounds write, which aborts the process and serves as a remote heap-corruption primitive. This vulnerability affects Node.js 26.x and 24.x.","ecosystems":[],"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":"Node.js is vulnerable to a heap buffer overflow in HTTP/2 session.altsvc() via a long origin","id":"CVE-2026-123828","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"Node.js is vulnerable to Permission Model file-name disclosure via recursive fs.watch","id":"CVE-2026-123829"},"nickname":null,"packages":[],"prev":{"headline":"Symfony: XXE (Local File Read) in Config XmlUtils::parse() via validateOnParse = true","id":"CVE-2026-123824"},"products":["node"],"published":"2026-11-11","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-11-11","vendors":["nodejs"]},"summary":"Remote attackers can send a long :authority header to Node.js HTTP/2 apps passing it to Alt-Svc, corrupting heap memory and crashing the process.","url":"https://insights.sbomify.com/CVE-2026-123828/"}