Description
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.
Affected products
jqlang: jq; redhat: ai inference server; redhat: ansible automation platform; redhat: ceph storage; redhat: codeready linux builder; redhat: codeready linux builder eus; redhat: hardened images; redhat: openshift ai; redhat: openshift container platform; redhat: enterprise linux; redhat: enterprise linux aus; redhat: enterprise linux eus; redhat: enterprise linux tus; redhat: enterprise linux update services for sap solutions
References10
- github.com/jqlang/jq/security/advisories/GHSA-2hhh-px8h-355p ExploitVendor Advisory
- github.com/jqlang/jq/security/advisories/GHSA-2hhh-px8h-355p ExploitVendor Advisory
- github.com/jqlang/jq/commit/2f09060afab23fe9390cce7cb860b10416e… Patch
- access.redhat.com/errata/RHSA-2026:16252 Third Party Advisory
- access.redhat.com/errata/RHSA-2026:16692 Third Party Advisory
- access.redhat.com/errata/RHSA-2026:16693 Third Party Advisory
- access.redhat.com/errata/RHSA-2026:18040 Third Party Advisory
- access.redhat.com/errata/RHSA-2026:18042 Third Party Advisory
- access.redhat.com/errata/RHSA-2026:18043 Third Party Advisory
- access.redhat.com/errata/RHSA-2026:18044 Third Party Advisory
Metrics
- CVSS 3.1
-
6.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L - CVSS 4.0
-
6.9
MEDIUM
Score source: CNA
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 1% percentile: 48 · as of 12 November 2026
- CWE
- CWE-125
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