# CVE-2026-32316: jq: Integer overflow in jvp_string_append() allows Heap-based Buffer Overflow CVE-2026-32316 is fixed in 5 products on 1 platform, first by jq 1.5+dfsg-2ubuntu0.1~esm2, released April 13, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-32316 - Priority: High - CVSS: 8.2 (Important) - EPSS: 0.0079 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Apr 13, 2026 - Weakness: Heap-based Buffer Overflow - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32316 ## 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | jq Debian 12.15 (bookworm) | 1.6-2.1+deb12u3 | [DEBIAN-CVE-2026-32316](https://patchblox.com/security/data/fix/linux/debian-cve-2026-32316.md) | Apr 13, 2026 | | Linux | jq Debian 13.5 (trixie) | 1.7.1-6+deb13u3 | [DEBIAN-CVE-2026-32316](https://patchblox.com/security/data/fix/linux/debian-cve-2026-32316.md) | Apr 13, 2026 | | Linux | jq Debian 14 | 1.8.1-5 | [DEBIAN-CVE-2026-32316](https://patchblox.com/security/data/fix/linux/debian-cve-2026-32316.md) | Apr 13, 2026 | | Linux | jq Fedora 43 | 1.8.1-3.fc43 | [FEDORA-2026-4E57162966](https://patchblox.com/security/data/fix/linux/fedora-2026-4e57162966.md) | Apr 16, 2026 | | Linux | jq Ubuntu 18.04.6 LTS (bionic) | 1.5+dfsg-2ubuntu0.1~esm2 | [jq 1.5+dfsg-2ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-jq-1.5-dfsg-2ubuntu0.1-esm2.md) | Apr 13, 2026 | | Linux | jq Ubuntu 20.04 LTS (focal) | 1.6-1ubuntu0.20.04.1+esm2 | [jq 1.6-1ubuntu0.20.04.1+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-jq-1.6-1ubuntu0.20.04.1-esm2.md) | Apr 13, 2026 | | Linux | jq Ubuntu 22.04.1 LTS (jammy) | 1.6-2.1ubuntu3.2 | [jq 1.6-2.1ubuntu3.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-jq-1.6-2.1ubuntu3.2.md) | Apr 13, 2026 | | Linux | jq Ubuntu 24.04.5 LTS (noble) | 1.7.1-3ubuntu0.24.04.2 | [jq 1.7.1-3ubuntu0.24.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-jq-1.7.1-3ubuntu0.24.04.2.md) | Apr 13, 2026 | | Linux | jq Ubuntu 25.10 (questing) | 1.8.1-3ubuntu1.1 | [jq 1.8.1-3ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-jq-1.8.1-3ubuntu1.1.md) | Apr 13, 2026 | | Linux | jq Ubuntu 26.04.1 LTS (resolute) | 1.8.1-4ubuntu2 | [jq 1.8.1-4ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-jq-1.8.1-4ubuntu2.md) | Apr 13, 2026 | | Linux | jq amzn 2023 | 1.8.1-59.amzn2023 | [ALAS2023-2026-1815](https://patchblox.com/security/data/fix/linux/alas2023-2026-1815.md) | Jun 8, 2026 | | Linux | jq opensuse-leap 16.0 | 1.7.1-160000.3.1 | [OPENSUSE-SU-2026:21248-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21248-1.md) | Jul 7, 2026 | | Linux | jq sles 15.7 | 1.6-150000.3.20.1 | [SUSE-SU-2026:2983-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2983-1.md) | Jul 14, 2026 | | Linux | jq sles 16.0 | 1.7.1-160000.3.1 | [SUSE-SU-2026:22566-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22566-1.md) | Jul 7, 2026 | | Linux | jq-debuginfo Fedora 43 | 1.8.1-3.fc43 | [FEDORA-2026-4E57162966](https://patchblox.com/security/data/fix/linux/fedora-2026-4e57162966.md) | Apr 16, 2026 | | Linux | jq-debuginfo amzn 2023 | 1.8.1-59.amzn2023 | [ALAS2023-2026-1815](https://patchblox.com/security/data/fix/linux/alas2023-2026-1815.md) | Jun 8, 2026 | | Linux | jq-debugsource Fedora 43 | 1.8.1-3.fc43 | [FEDORA-2026-4E57162966](https://patchblox.com/security/data/fix/linux/fedora-2026-4e57162966.md) | Apr 16, 2026 | | Linux | jq-debugsource amzn 2023 | 1.8.1-59.amzn2023 | [ALAS2023-2026-1815](https://patchblox.com/security/data/fix/linux/alas2023-2026-1815.md) | Jun 8, 2026 | | Linux | jq-devel Fedora 43 | 1.8.1-3.fc43 | [FEDORA-2026-4E57162966](https://patchblox.com/security/data/fix/linux/fedora-2026-4e57162966.md) | Apr 16, 2026 | | Linux | jq-devel amzn 2023 | 1.8.1-59.amzn2023 | [ALAS2023-2026-1815](https://patchblox.com/security/data/fix/linux/alas2023-2026-1815.md) | Jun 8, 2026 | | Linux | libjq1 Ubuntu 18.04.6 LTS (bionic) | 1.5+dfsg-2ubuntu0.1~esm2 | [libjq1 1.5+dfsg-2ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libjq1-1.5-dfsg-2ubuntu0.1-esm2.md) | Apr 13, 2026 | | Linux | libjq1 Ubuntu 20.04 LTS (focal) | 1.6-1ubuntu0.20.04.1+esm2 | [libjq1 1.6-1ubuntu0.20.04.1+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libjq1-1.6-1ubuntu0.20.04.1-esm2.md) | Apr 13, 2026 | | Linux | libjq1 Ubuntu 22.04.1 LTS (jammy) | 1.6-2.1ubuntu3.2 | [libjq1 1.6-2.1ubuntu3.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libjq1-1.6-2.1ubuntu3.2.md) | Apr 13, 2026 | | Linux | libjq1 Ubuntu 24.04.5 LTS (noble) | 1.7.1-3ubuntu0.24.04.2 | [libjq1 1.7.1-3ubuntu0.24.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libjq1-1.7.1-3ubuntu0.24.04.2.md) | Apr 13, 2026 | | Linux | libjq1 Ubuntu 25.10 (questing) | 1.8.1-3ubuntu1.1 | [libjq1 1.8.1-3ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libjq1-1.8.1-3ubuntu1.1.md) | Apr 13, 2026 | | Linux | libjq1 Ubuntu 26.04.1 LTS (resolute) | 1.8.1-4ubuntu2 | [libjq1 1.8.1-4ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libjq1-1.8.1-4ubuntu2.md) | Apr 13, 2026 | --- Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.