{"answers":{"affected":"It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44638 exists.","fix":"Upgrade to a fixed version.","what":"CVE-2026-44638 is a low-severity vulnerability in saitoha libsixel, published on 14 May 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-2026-44638 and fix it if it is affected.\n\nWhat it is: CVE-2026-44638 is a low-severity vulnerability in saitoha libsixel, published on 14 May 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: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44638 exists.\n\nAffected product: saitoha libsixel. 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-2026-44638/ (Markdown: https://insights.sbomify.com/CVE-2026-44638/index.md)","id":"CVE-2026-44638","markdown":"https://insights.sbomify.com/CVE-2026-44638/index.md","name":"CVE-2026-44638","record":{"aliases":["DEBIAN-CVE-2026-44638","GHSA-wpx3-h5g8-qr3w","UBUNTU-CVE-2026-44638"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"SIXEL image library","requires_auth":"none","summary":"A NULL pointer dereference in libsixel causes a crash when memory allocation fails, leading to denial of service for applications using the library.","user_interaction":"required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"libsixel","vendor":"saitoha"}],"cvss":{"score":2.5,"severity":"low","source":"cna","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-690","name":"Unchecked Return Value to NULL Pointer Dereference"},{"id":"CWE-476","name":"NULL Pointer Dereference"}],"description":"libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. From  to 1.8.7-r1, a wrong NULL check after an allocation call in sixel_decode_raw and sixel_decode causes a NULL pointer dereference whenever the allocation fails. The check tests the address of the output parameter (always non-NULL) instead of the value the malloc returned. On allocation failure, the function continues and writes through a NULL pointer, crashing the process. This is a denial of service against any caller of these public APIs that hits a low-memory condition. This vulnerability is fixed in 1.8.7-r2.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"libsixel: NULL pointer dereference","id":"CVE-2026-44638","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"null_dereference","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"NanoMQ: O(N²) Denial of Service in MQTT v5 Property Parsing","id":"CVE-2026-44639"},"packages":[],"prev":{"headline":"libsixel: integer overflow in parser","id":"CVE-2026-44637"},"products":["libsixel"],"published":"2026-05-14","related":[{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2019-19635","kev_date_added":null,"published":"2019-12-08"},{"cvss_score":9.8,"headline":"Integer overflow in n/a","id":"CVE-2019-19636","kev_date_added":null,"published":"2019-12-08"},{"cvss_score":9.8,"headline":"Integer overflow in n/a","id":"CVE-2019-19637","kev_date_added":null,"published":"2019-12-08"},{"cvss_score":9.8,"headline":"Integer overflow in n/a","id":"CVE-2019-19638","kev_date_added":null,"published":"2019-12-08"},{"cvss_score":8.8,"headline":"Memory corruption in n/a","id":"CVE-2022-27044","kev_date_added":null,"published":"2022-04-08"},{"cvss_score":8.8,"headline":"Use after free in n/a","id":"CVE-2022-27046","kev_date_added":null,"published":"2022-04-08"},{"cvss_score":8.8,"headline":"Memory corruption in n/a","id":"CVE-2020-21547","kev_date_added":null,"published":"2021-09-17"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-05-15","vendors":["saitoha"]},"summary":"A NULL pointer dereference in libsixel causes a crash when memory allocation fails, leading to denial of service for applications using the library.","url":"https://insights.sbomify.com/CVE-2026-44638/"}