{"answers":{"affected":"It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39956 exists.","fix":"Upgrade to a fixed version.","what":"CVE-2026-39956 is a medium-severity memory corruption vulnerability in jqlang jq, published on 13 Apr 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-2026-39956 and fix it if it is affected.\n\nWhat it is: CVE-2026-39956 is a medium-severity memory corruption vulnerability in jqlang jq, published on 13 Apr 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-2026-39956 exists.\n\nAffected product: jqlang jq. 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-2026-39956/ (Markdown: https://insights.sbomify.com/CVE-2026-39956/index.md)","id":"CVE-2026-39956","markdown":"https://insights.sbomify.com/CVE-2026-39956/index.md","name":"CVE-2026-39956","record":{"aliases":["ALPINE-CVE-2026-39956","AZL-82973","BELL-CVE-2026-39956","CLSA-2026-1786762772","CLSA-2026-1787781806","DEBIAN-CVE-2026-39956","ECHO-70de-e2dc-f745","GHSA-6gc3-3g9p-xx28"],"analysis":{"component_type":"developer_tool","fix_type":"upgrade","impacts":["denial_of_service","data_read"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"JSON processor","requires_auth":"none","summary":"Attackers can crash jq or read limited memory by exploiting missing type checks in the _strindices builtin when processing untrusted filters.","user_interaction":"required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"jq","vendor":"jqlang"}],"cvss":{"score":6.1,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-843","name":"Access of Resource Using Incompatible Type"},{"id":"CWE-476","name":"NULL Pointer Dereference"},{"id":"CWE-125","name":"Out-of-bounds Read"}],"description":"jq is a command-line JSON processor. Prior to version 1.8.2, the _strindices builtin in jq's src/builtin.c passes its arguments directly to jv_string_indexes() without verifying they are strings, and jv_string_indexes() in src/jv.c relies solely on assert() checks that are stripped in release builds compiled with -DNDEBUG. This allows an attacker to crash jq trivially with input like _strindices(0), and by crafting a numeric value whose IEEE-754 bit pattern maps to a chosen pointer, achieve a controlled pointer dereference and limited memory read/probe primitive. Any deployment that evaluates untrusted jq filters against a release build is vulnerable. This issue has been patched in commit fdf8ef0f0810e3d365cdd5160de43db46f57ed03, which is part of version 1.8.2.","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":"jq: Missing runtime type checks for _strindices lead to crash and limited memory disclosure","id":"CVE-2026-39956","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":"Missing authorization in Lychee","id":"CVE-2026-39957"},"packages":[],"prev":{"headline":"Cacti has Pre-Authentication SQL Injection via unanchored FILTER_VALIDATE_REGEXP in graph_view.php","id":"CVE-2026-39955"},"products":["jq"],"published":"2026-04-13","related":[{"cvss_score":8.2,"headline":"jq: Integer overflow in jvp_string_append() allows Heap-based Buffer Overflow","id":"CVE-2026-32316","kev_date_added":null,"published":"2026-04-13"},{"cvss_score":8.1,"headline":"Memory corruption in jq","id":"CVE-2024-53427","kev_date_added":null,"published":"2025-02-26"},{"cvss_score":7.7,"headline":"AddressSanitizer: stack-buffer-overflow in jq_fuzz_execute (jv_string_vfmt)","id":"CVE-2025-48060","kev_date_added":null,"published":"2025-05-21"},{"cvss_score":7.5,"headline":"Memory corruption in n/a","id":"CVE-2023-49355","kev_date_added":null,"published":"2023-12-11"},{"cvss_score":7.1,"headline":"jq --rawfile invalid-state reuse after String too long causes heap-buffer-overflow","id":"CVE-2026-49839","kev_date_added":null,"published":"2026-06-25"},{"cvss_score":6.9,"headline":"jq: potential integer overflow in jvp_string_append","id":"CVE-2026-54679","kev_date_added":null,"published":"2026-06-25"},{"cvss_score":6.9,"headline":"jq: Out-of-Bounds Read in jv_parse_sized() Error Formatting for Non-NUL-Terminated Counted Buffers","id":"CVE-2026-39979","kev_date_added":null,"published":"2026-04-13"}],"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":"2026-09-04","vendors":["jqlang"]},"summary":"Attackers can crash jq or read limited memory by exploiting missing type checks in the _strindices builtin when processing untrusted filters.","url":"https://insights.sbomify.com/CVE-2026-39956/"}