CVE-2025-9403 jqlang jq JSON jq_test.c run_jq_tests assertion
A local attacker can trigger a reachable assertion failure in the jq JSON parser's test runner, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-9403?
CVE-2025-9403 is a medium-severity denial of service vulnerability in jqlang jq, published on 25 Aug 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability was determined in jqlang jq up to 1.6. Impacted is the function run_jq_tests of the file jq_test.c of the component JSON Parser. Executing manipulation can lead to reachable assertion. The attack requires local access. The exploit has been publicly disclosed and may be utilized. Other versions might be affected as well.
Weakness: CWE-617
Which versions are affected by CVE-2025-9403?
It affects 1 product.
Linux distribution packages (7)
jq SUSE:Linux Enterprise Micro 5.2 | All versions | 1.6-150000.3.12.1 |
jq SUSE:Linux Enterprise Micro 5.3 | All versions | 1.6-150000.3.12.1 |
jq SUSE:Linux Enterprise Micro 5.4 | All versions | 1.6-150000.3.12.1 |
jq SUSE:Linux Enterprise Micro 5.5 | All versions | 1.6-150000.3.12.1 |
jq SUSE:Linux Enterprise Module for Basesystem 15 SP7 | All versions | 1.6-150000.3.12.1 |
jq openSUSE:Leap 15.6 | All versions | 1.6-150000.3.12.1 |
jq openSUSE:Tumbleweed | All versions | 1.8.2-2.1 |
Products include Jqlang Jq.
How do I fix CVE-2025-9403?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-9403 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-9403 exists.
Other vulnerabilities in jqlang jq
- CVE-2026-32316 jq: Integer overflow in jvp_string_append() allows Heap-based Buffer Overflow
- CVE-2024-53427 Memory corruption in jq
- CVE-2025-48060 AddressSanitizer: stack-buffer-overflow in jq_fuzz_execute (jv_string_vfmt)
- CVE-2023-49355 Memory corruption in n/a
- CVE-2026-49839 jq --rawfile invalid-state reuse after String too long causes heap-buffer-overflow
Sources
Also known as AZL-66678, AZL-85554, BELL-CVE-2025-9403, DEBIAN-CVE-2025-9403, ECHO-e20f-69f2-003a, GHSA-45r2-rx5v-q5f6 and 4 more.