CVE-2026-49839Public exploit

Process crash via raw-file invalid-state reuse

Published Jun 25, 2026 · Updated Jun 25, 2026

Heap out-of-bounds write in jqlang jq before 1.8.2 allows local users to crash jq via an oversized file processed with --rawfile. The jv_load_file raw-input loop continues after jv_string_append_buf returns an invalid value for an overlong string, then reuses that state as a string. Exploitation requires a user or workflow to process an attacker-controlled file larger than 2 GiB; assertion-enabled builds abort, while assertion-disabled builds incur heap corruption and process termination.

CVSS severity7.1
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap out-of-bounds write in jqlang jq before 1.8.2 allows local users to crash jq via an oversized file processed with --rawfile. The jv_load_file raw-input loop continues after jv_string_append_buf returns an invalid value for an overlong string, then reuses that state as a string. Exploitation requires a user or workflow to process an attacker-controlled file larger than 2 GiB; assertion-enabled builds abort, while assertion-disabled builds incur heap corruption and process termination.

The record

CVE
CVE-2026-49839
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
jqlang
Product
jq
Classifications
CWE-787, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.8.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

jqlang · jqversion=< 1.8.2

Published CVSS scores

7.1GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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