{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-77220 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-77220 is a high-severity use after free vulnerability in michaelrsweet pdfio, published on 21 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-77220 and fix it if it is affected.\n\nWhat it is: CVE-2026-77220 is a high-severity use after free vulnerability in michaelrsweet pdfio, published on 21 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-77220 in the wild and no public exploit code.\n\nAffected product: michaelrsweet pdfio. 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-2026-77220/ (Markdown: https://insights.sbomify.com/CVE-2026-77220/index.md)","id":"CVE-2026-77220","markdown":"https://insights.sbomify.com/CVE-2026-77220/index.md","name":"CVE-2026-77220","record":{"aliases":["DEBIAN-CVE-2026-77220","GHSA-2fr4-jfvm-chmp","UBUNTU-CVE-2026-77220"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_modify","data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"PDF processing library","requires_auth":"low_privilege","summary":"Attackers can corrupt document data or read sensitive information by exploiting a dangling pointer in PDFio's dictionary string formatting.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":7.1,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-825","name":"Expired Pointer Dereference"}],"description":"PDFio before 1.6.5 contains a dangling pointer vulnerability in the dictionary string-formatting function that stores a pointer to a stack-local buffer in the document dictionary without copying the string value. In multi-threaded or pooled-request environments, attackers or concurrent users can trigger stack memory reuse across requests, causing cross-tenant document content corruption by silently overwriting one caller's dictionary string values with another caller's data.","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":"PDFio \u003c 1.6.5 Dangling Pointer via Dictionary String-Formatting","id":"CVE-2026-77220","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"use_after_free","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.","id":"CVE-2026-77221"},"packages":[],"prev":{"headline":"GNU Emacs \u003c 31.0.91 Heap Over-Read via PBM/PPM/PGM Image Loader","id":"CVE-2026-77219"},"products":["pdfio"],"published":"2026-08-21","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":"2026-10-01","vendors":["michaelrsweet"]},"summary":"Attackers can corrupt document data or read sensitive information by exploiting a dangling pointer in PDFio's dictionary string formatting.","url":"https://insights.sbomify.com/CVE-2026-77220/"}