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Vulnerabilities/CVE-2026-39979Public Intelligence Dossier
Source: jqlang · Limited verification•Last verified: •Collection Degraded
CVE-2026-39979Unknown / EvaluatingHIGH (raw)CVSS 8.2CWE-125

jq is a command-line JSON processor

Published: 14 Apr 2026•Last updated: 27 Oct 2026, 03:40 AM IST•Source identifier: security-advisories@github.com
Dossier completeness: source-provided sections 2 / 3 · rule guidance available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Unknown
KEV status was not determined.
CVSS score
8.2HIGH (raw)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Metric source0b0ca135-0b70-47e7-9f44-1890c2a1c46c
EPSS probability
0.6%0.006
Percentile47th
Weakness type
CWE-125
No further CWE recorded
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

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.

SOC priority

High

Actively exploited (source statement)

Unknown

Publicly disclosed

Unknown

Risk basis: SOC ecosystem technology relevance; HIGH severity; Source severity; no confirmed exploitation signal

Affected Products & Remediation

14 source-backed products
Affected products and versions (source)
  • jqlang jq · < 1.8.2 · NVD CPE · Source
  • redhat ai inference server · >= 3.2.0 < 3.2.2; >= 3.3.0 < 3.3.5 · NVD CPE · Source
  • redhat ansible automation platform · 2.0 · NVD CPE · Source
  • redhat ceph storage · 4.0 · NVD CPE · Source
  • redhat codeready linux builder · 8.0; 9.0; 10.0; eus 9.4; eus 9.6; eus 10.0 · NVD CPE · Source
  • redhat codeready linux builder eus · 9.4; 9.6; 10.0 · NVD CPE · Source
  • redhat hardened images · version range not provided by source · NVD CPE · Source
  • redhat openshift ai · >= 3.4 < 3.4.3 · NVD CPE · Source
  • redhat openshift container platform · >= 4.12 < 4.12.92; >= 4.13 < 4.13.68; >= 4.14 < 4.14.68; >= 4.15 < 4.15.65; >= 4.16 < 4.16.64; >= 4.17 < 4.17.55; >= 4.18 < 4.18.44; >= 4.19 < 4.19.33 · NVD CPE · Source
  • redhat enterprise linux · 8.0; 9.0; 10.0; aus 8.4; aus 8.6; eus 8.4; eus 9.4; eus 9.6; eus 10.0; tus 8.6; tus 8.8; update services for sap solutions 8.6; update services for sap solutions 8.8; update services for sap solutions 9.0; update services for sap solutions 9.2 · NVD CPE · Source
  • redhat enterprise linux aus · 8.4; 8.6 · NVD CPE · Source
  • redhat enterprise linux eus · 8.4; 9.4; 9.6; 10.0 · NVD CPE · Source
  • redhat enterprise linux tus · 8.6; 8.8 · NVD CPE · Source
  • redhat enterprise linux update services for sap solutions · 8.6; 8.8; 9.0; 9.2 · NVD CPE · Source
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

Not provided by source

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Unknown
Exploited (source statement)
Unknown
Publicly disclosed (source)
Unknown

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

Matched network-unauthenticated (CVSS AV:N, CVSS PR:N, CVSS UI:N)

Exposure

  1. Identify devices reporting this CVE and note which expose the affected service to untrusted networks.Telemetry: DeviceTvmSoftwareVulnerabilities · A network-reachable, no-privilege vector makes internet-facing instances the first exposure question. · Rule network-unauthenticated

Exploitation evidence

  1. Review inbound connections to the affected service from unexpected sources since the advisory date.Telemetry: DeviceNetworkEvents · Hunting hypothesis from the CVSS vector; it does not show that exploitation occurred. · Rule network-unauthenticated

Response

  1. Confirm the source-stated update is installed and the CVE is no longer reported.Telemetry: DeviceTvmSoftwareVulnerabilities · A follow-up inventory check verifies remediation. · Rule network-unauthenticated

CISA KEV Record

CISA KEV status was not determined for this record.

Change History & Source Data

— No recorded material change

CNA / source
security-advisories@github.com
Record status · verification
UPDATED · NVD API
CPE
cpe:2.3:a:jqlang:jq:*:*:*:*:*:*:*:*, cpe:2.3:a:redhat:ai_inference_server:*:*:*:*:*:*:*:*, cpe:2.3:a:redhat:ansible_automation_platform:2.0:*:*:*:*:*:*:*, cpe:2.3:a:redhat:ceph_storage:4.0:*:*:*:*:*:*:*, cpe:2.3:a:redhat:codeready_linux_builder:8.0:*:*:*:*:*:*:*, cpe:2.3:a:redhat:codeready_linux_builder:9.0:*:*:*:*:*:*:*, cpe:2.3:a:redhat:codeready_linux_builder:10.0:*:*:*:*:*:*:*, cpe:2.3:a:redhat:codeready_linux_builder_eus:9.4:*:*:*:*:*:*:*, cpe:2.3:a:redhat:codeready_linux_builder_eus:9.6:*:*:*:*:*:*:*, cpe:2.3:a:redhat:codeready_linux_builder_eus:10.0:*:*:*:*:*:*:*

Evidence & Provenance

3 public sources
github.comSource recordnvd.nist.govSource recordgithub.comSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2026-39979
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2026-39979
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2026-39979"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
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Correlated briefings

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.