Answer in brief
CVE-2026-39979 records a Medium severity (CVSS 6.9) vulnerability in jq: Out-of-Bounds Read in jv_parse_sized() Error Formatting for Non-NUL-Terminated Counted Buffers. The current sources do not mark it as known exploited. The current feed maps Red Hat/ansible-automation-platform-26/controller-rhel9 (generic), jqlang/jq (generic), Red Hat/jq (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Red Hat/ansible-automation-platform-26/controller-rhel9 (generic), jqlang/jq (generic), Red Hat/jq (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:jqlang:jq:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:redhat:ai_inference_server:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:redhat:ansible_automation_platform:2.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:redhat:ceph_storage:4.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:redhat:codeready_linux_builder:10.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:redhat:codeready_linux_builder:8.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:redhat:codeready_linux_builder:9.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:redhat:codeready_linux_builder_eus:10.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:redhat:codeready_linux_builder_eus:9.4:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:redhat:codeready_linux_builder_eus:9.6:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:redhat:hardened_images:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:redhat:openshift_ai:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:redhat:openshift_container_platform:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_aus:8.4:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_aus:8.6:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_eus:10.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_eus:8.4:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_eus:9.4:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_eus:9.6:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_tus:8.6:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_tus:8.8:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_update_services_for_sap_solutions:8.6:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_update_services_for_sap_solutions:8.8:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_update_services_for_sap_solutions:9.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_update_services_for_sap_solutions:9.2:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Red Hat/ansible-automation-platform-26/controller-rhel9generic | * | Not reported |
| jqlang/jqgeneric | <2f09060afab23fe9390cce7cb860b10416e1bf5f | 2f09060afab23fe9390cce7cb860b10416e1bf5f |
| Red Hat/jqgeneric | * | Not reported |
Published upstream
Apr 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 26, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 2, 2026
jq is a command-line JSON processor. In commits before 2f09060afab23fe9390cce7cb860b10416e1bf5f, the jv_parse_sized() API in libjq accepts a counted buffer with an explicit length parameter, but its error-handling path formats the input buffer using %s in jv_string_fmt(), which reads until a NUL terminator is found rather than respecting the caller-supplied length. This means that when malformed JSON is passed in a non-NUL-terminated buffer, the error construction logic performs an out-of-bounds read past the end of the buffer. The vulnerability is reachable by any libjq consumer calling jv_parse_sized() with untrusted input, and depending on memory layout, can result in memory disclosure or process termination. The issue has been patched in commit 2f09060afab23fe9390cce7cb860b10416e1bf5f.
Quoted source text, attributed separately from HOL analysis.