{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-107738 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-107738 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-107738 is a medium-severity denial of service vulnerability in sumatrapdfreader sumatrapdf, published on 8 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-107738 and fix it if it is affected.\n\nWhat it is: CVE-2026-107738 is a medium-severity denial of service vulnerability in sumatrapdfreader sumatrapdf, published on 8 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-107738 in the wild and no public exploit code.\n\nAffected product: sumatrapdfreader sumatrapdf. 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.\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-2026-107738/ (Markdown: https://insights.sbomify.com/CVE-2026-107738/index.md)","id":"CVE-2026-107738","markdown":"https://insights.sbomify.com/CVE-2026-107738/index.md","name":"CVE-2026-107738","record":{"aliases":["GHSA-33jg-vxm6-8mxx"],"analysis":{"component_type":"desktop_application","fix_type":"no_fix_stated","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"PDF reader","requires_auth":"none","summary":"Attackers can cause SumatraPDF to crash by providing a malicious CHM file with invalid string offsets, leading to application termination.","user_interaction":"required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":6.8,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-125","name":"Out-of-bounds Read"}],"description":"SumatraPDF is a multi-format reader for Windows. In 3.6.1 and earlier, ChmFile::GetCharZ() narrows file-controlled unsigned string offsets from /#WINDOWS and /#IVB to signed integers without a lower-bound check. An offset that becomes negative can make the function read before the /#STRINGS buffer, causing deterministic application termination. No broader impact is claimed beyond the advisory-supported conditions. No fixed version is available as of this review.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"SumatraPDF: Untrusted binary record offset used without lower-bound validation","id":"CVE-2026-107738","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"10Web Booster \u003c= 2.34.8 - Unauthenticated Stored Cross-Site Scripting via Comment Author Name","id":"CVE-2026-107742"},"packages":[],"prev":{"headline":"SumatraPDF CHM `its://` signed index causes an out-of-bounds object lookup","id":"CVE-2026-107737"},"products":["sumatrapdf"],"published":"2026-10-08","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":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-14","vendors":["sumatrapdfreader"]},"summary":"Attackers can cause SumatraPDF to crash by providing a malicious CHM file with invalid string offsets, leading to application termination.","url":"https://insights.sbomify.com/CVE-2026-107738/"}