# CVE-2026-49839: jq --rawfile invalid-state reuse after String too long causes heap-buffer-overflow

CVE-2026-49839 is fixed in 4 products on 1 platform, first by ALAS2023-2026-1860, released June 22, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-49839
- Priority: High
- CVSS: 7.1 (Important)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 22, 2026
- Weakness: Out-of-bounds Write
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49839

## Description

jq is a command-line JSON processor. Prior to 1.8.2,` jq --rawfile` can turn a handled oversized-string error into invalid-state reuse and a real heap out-of-bounds write in assertion-disabled builds. When jv_load_file(raw=1) reads an attacker-controlled file, it repeatedly appends file chunks to the same jv string accumulator. Once jv_string_append_buf() returns jv_invalid_with_msg("String too long"), the raw-file loop does not stop. If the file contains at least one more byte, the next loop iteration appends a new chunk to an object that is already invalid. With assertions enabled this aborts in jvp_string_ptr(). With assertions disabled, the invalid object is interpreted as a string object and ASan reports heap-buffer-overflow. This vulnerability is fixed in 1.8.2.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | jq Debian 12.15 (bookworm) | 1.6-2.1+deb12u2 | [DEBIAN-CVE-2026-49839](https://patchblox.com/security/data/fix/linux/debian-cve-2026-49839.md) | Jun 24, 2026 |
| Linux | jq Debian 13.5 (trixie) | 1.7.1-6+deb13u3 | [DEBIAN-CVE-2026-49839](https://patchblox.com/security/data/fix/linux/debian-cve-2026-49839.md) | Jun 24, 2026 |
| Linux | jq Debian 14 | 1.8.1-8 | [DEBIAN-CVE-2026-49839](https://patchblox.com/security/data/fix/linux/debian-cve-2026-49839.md) | Jun 24, 2026 |
| Linux | jq amzn 2023 | 1.8.1-60.amzn2023 | [ALAS2023-2026-1860](https://patchblox.com/security/data/fix/linux/alas2023-2026-1860.md) | Jun 22, 2026 |
| Linux | jq opensuse-leap 16.0 | 1.7.1-160000.4.1 | [OPENSUSE-SU-2026:21318-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21318-1.md) | Jul 13, 2026 |
| Linux | jq sles 15.6 | 1.7.1-150000.3.25.1 | [SUSE-SU-2026:4275-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4275-1.md) | Sep 21, 2026 |
| Linux | jq sles 15.7 | 1.7.1-150000.3.25.1 | [SUSE-SU-2026:4275-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4275-1.md) | Sep 21, 2026 |
| Linux | jq sles 16.0 | 1.7.1-160000.4.1 | [SUSE-SU-2026:22637-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22637-1.md) | Jul 13, 2026 |
| Linux | jq-debuginfo amzn 2023 | 1.8.1-60.amzn2023 | [ALAS2023-2026-1860](https://patchblox.com/security/data/fix/linux/alas2023-2026-1860.md) | Jun 22, 2026 |
| Linux | jq-debugsource amzn 2023 | 1.8.1-60.amzn2023 | [ALAS2023-2026-1860](https://patchblox.com/security/data/fix/linux/alas2023-2026-1860.md) | Jun 22, 2026 |
| Linux | jq-devel amzn 2023 | 1.8.1-60.amzn2023 | [ALAS2023-2026-1860](https://patchblox.com/security/data/fix/linux/alas2023-2026-1860.md) | Jun 22, 2026 |

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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

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