Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2026-32316
jqlang jq — jq: Integer overflow in jvp_string_append() allows Heap-based Buffer Overflow
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L N N U N N H 7.5 .0079 55.5 —
AFFECTED
Product Versions Fixed
jq < e47e56d226519635768e6aab2f38f0ab037c09e5 – —
TIMELINE
Mar 11 Reserved by GitHub_M
Apr 13 Published (CNA: GitHub_M)
Oct 16 EXPLOIT PUBLISHED — CVE-2026-32316 (jqlang jq). Public exploit reference added.
Oct 16 RESCORED — CVE-2026-32316 (jqlang jq). CVSS 8.2 → 7.5 (NVD).
Description
jq is a command-line JSON processor. An integer overflow vulnerability exists through version 1.8.1 within the jvp_string_append() and jvp_string_copy_replace_bad functions, where concatenating strings with a combined length exceeding 2^31 bytes causes a 32-bit unsigned integer overflow in the buffer allocation size calculation, resulting in a drastically undersized heap buffer. Subsequent memory copy operations then write the full string data into this undersized buffer, causing a heap buffer overflow classified as CWE-190 (Integer Overflow) leading to CWE-122 (Heap-based Buffer Overflow). Any system evaluating untrusted jq queries is affected, as an attacker can crash the process or potentially achieve further exploitation through heap corruption by crafting queries that produce extremely large strings. The root cause is the absence of string size bounds checking, unlike arrays and objects which already have size limits. The issue has been addressed in commit e47e56d226519635768e6aab2f38f0ab037c09e5.
Lifecycle
Complete event history — 4 events, chronological
| Date | Event | Detail |
|---|
| March 11, 2026 | Reserved | Reserved by GitHub_M |
| April 13, 2026 | Published | Published (CNA: GitHub_M) |
| October 16, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-32316 (jqlang jq). Public exploit reference added. |
| October 16, 2026 | RESCORED | RESCORED — CVE-2026-32316 (jqlang jq). CVSS 8.2 → 7.5 (NVD). |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| jqlang | jq | — | < e47e56d226519635768e6aab2f38f0ab037c09e5 | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-32316 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
