{"answers":{"affected":"2 open source packages ship an affected version, including Nerdbank.MessagePack.","exploited":"There is no known exploitation of CVE-2026-44375 in the wild and no public exploit code.","fix":"Upgrade Nerdbank.MessagePack to 1.1.62 or later.","what":"CVE-2026-44375 is a high-severity denial of service vulnerability in AArnott Nerdbank.MessagePack, published on 14 May 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-2026-44375 and fix it if it is affected.\n\nWhat it is: CVE-2026-44375 is a high-severity denial of service vulnerability in AArnott Nerdbank.MessagePack, published on 14 May 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-2026-44375 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- Nerdbank.MessagePack (NuGet): affected all versions; fixed in 1.1.62\n- Nerdbank.MessagePack (NuGet): affected all versions; fixed in 1.1.62\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-2026-44375/ (Markdown: https://insights.sbomify.com/CVE-2026-44375/index.md)","id":"CVE-2026-44375","markdown":"https://insights.sbomify.com/CVE-2026-44375/index.md","name":"CVE-2026-44375","record":{"aliases":["GHSA-2cwq-pwfr-wcw3"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"MessagePack serialization library","requires_auth":"none","summary":"A malicious MessagePack payload can trigger a StackOverflowException via uncontrolled stack allocation, crashing the application.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-789","name":"Memory Allocation with Excessive Size Value"}],"description":"Nerdbank.MessagePack is a NativeAOT-compatible MessagePack serialization library. Prior to 1.1.62, Nerdbank.MessagePack contains an uncontrolled stack allocation vulnerability in DateTime decoding. A malicious MessagePack payload can declare an oversized timestamp extension length, causing the reader to allocate an attacker-controlled number of bytes on the stack. This can trigger a StackOverflowException, which is not catchable by user code and terminates the process. This vulnerability is fixed in 1.1.62.","ecosystems":["NuGet"],"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":"Nerdbank.MessagePack: Attacker-controlled stackalloc in DateTime decoding causes process-terminating StackOverflowException","id":"CVE-2026-44375","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"NuGet","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":2,"n_references":4,"next":{"headline":"CubeCart: Reflected XSS in Store Search Bar","id":"CVE-2026-44376"},"packages":[{"ecosystem":"NuGet","fixed":["1.1.62"],"introduced":["0"],"last_affected":[],"package":"Nerdbank.MessagePack","purl":null,"source":"GHSA-2cwq-pwfr-wcw3"},{"ecosystem":"NuGet","fixed":["1.1.62"],"introduced":["0"],"last_affected":[],"package":"Nerdbank.MessagePack","purl":"pkg:nuget/Nerdbank.MessagePack","source":"GHSA-2cwq-pwfr-wcw3"}],"prev":{"headline":"Backstage: Catalog unprocessed read endpoints allow authenticated cross-owner data access without permission checks","id":"CVE-2026-44374"},"products":["Nerdbank.MessagePack"],"published":"2026-05-14","related":[],"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":"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":"2026-05-14","vendors":["AArnott"]},"summary":"A malicious MessagePack payload can trigger a StackOverflowException via uncontrolled stack allocation, crashing the application.","url":"https://insights.sbomify.com/CVE-2026-44375/"}