CVE-2026-40164 (GCVE-0-2026-40164)

Vulnerability from cvelistv5 – Published: 2026-04-13 23:40 – Updated: 2026-06-30 12:08
VLAI
Title
jq: Algorithmic complexity DoS via hardcoded MurmurHash3 seed
Summary
jq is a command-line JSON processor. Before commit 0c7d133c3c7e37c00b6d46b658a02244fdd3c784, jq used MurmurHash3 with a hardcoded, publicly visible seed (0x432A9843) for all JSON object hash table operations, which allowed an attacker to precompute key collisions offline. By supplying a crafted JSON object (~100 KB) where all keys hashed to the same bucket, hash table lookups degraded from O(1) to O(n), turning any jq expression into an O(n²) operation and causing significant CPU exhaustion. This affected common jq use cases such as CI/CD pipelines, web services, and data processing scripts, and was far more practical to exploit than existing heap overflow issues since it required only a small payload. This issue has been patched in commit 0c7d133c3c7e37c00b6d46b658a02244fdd3c784.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-328 - Use of Weak Hash
  • CWE-407 - Inefficient Algorithmic Complexity
  • CWE-341 - Predictable from Observable State
Assigner
References
URL Tags
https://github.com/jqlang/jq/security/advisories/… x_refsource_CONFIRM
https://github.com/jqlang/jq/commit/0c7d133c3c7e3… x_refsource_MISC
https://access.redhat.com/security/cve/CVE-2026-40164 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2458084 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:26528 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26542 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:23233 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25044 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25181 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:23245 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:16252 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:18048 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:18047 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:18046 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:18045 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:18044 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:18040 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:16692 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19151 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:18043 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:18042 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:16693 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19365 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25096 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30078 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30089 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30088 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30087 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:8579 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version
jqlang jq Affected: < 0c7d133c3c7e37c00b6d46b658a02244fdd3c784
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Red Hat Red Hat OpenShift Container Platform 4.12     cpe:/a:redhat:openshift:4.12::el8
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Red Hat Red Hat OpenShift Container Platform 4.13     cpe:/a:redhat:openshift:4.13::el9
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Red Hat Red Hat OpenShift Container Platform 4.15     cpe:/a:redhat:openshift:4.15::el9
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Red Hat Red Hat OpenShift Container Platform 4.16     cpe:/a:redhat:openshift:4.16::el9
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Red Hat Red Hat OpenShift Container Platform 4.18     cpe:/a:redhat:openshift:4.18::el9
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Red Hat Red Hat OpenShift Container Platform 4.19     cpe:/a:redhat:openshift:4.19::el9
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Red Hat Red Hat Enterprise Linux AppStream (v. 8)     cpe:/a:redhat:enterprise_linux:8::appstream
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Red Hat Red Hat Enterprise Linux AppStream AUS (v.8.4)     cpe:/a:redhat:rhel_aus:8.4::appstream
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Red Hat Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)     cpe:/a:redhat:rhel_eus_long_life:8.4::appstream
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Red Hat Red Hat Enterprise Linux AppStream AUS (v.8.6)     cpe:/a:redhat:rhel_aus:8.6::appstream
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.8.6)     cpe:/a:redhat:rhel_e4s:8.6::appstream
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Red Hat Red Hat Enterprise Linux AppStream TUS (v.8.6)     cpe:/a:redhat:rhel_tus:8.6::appstream
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.8.8)     cpe:/a:redhat:rhel_e4s:8.8::appstream
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Red Hat Red Hat Enterprise Linux AppStream TUS (v.8.8)     cpe:/a:redhat:rhel_tus:8.8::appstream
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.9.0)     cpe:/a:redhat:rhel_e4s:9.0::appstream
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.9.2)     cpe:/a:redhat:rhel_e4s:9.2::appstream
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Red Hat Red Hat Enterprise Linux BaseOS EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux BaseOS (v. 10)     cpe:/o:redhat:enterprise_linux:10.1
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux BaseOS EUS (v.9.4)     cpe:/o:redhat:rhel_eus:9.4::baseos
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Red Hat Red Hat Enterprise Linux BaseOS EUS (v.9.6)     cpe:/o:redhat:rhel_eus:9.6::baseos
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Red Hat Red Hat Enterprise Linux BaseOS (v. 9)     cpe:/o:redhat:enterprise_linux:9::baseos
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)     cpe:/o:redhat:enterprise_linux:10.1
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux CRB (v. 8)     cpe:/a:redhat:enterprise_linux:8::crb
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Red Hat Red Hat CodeReady Linux Builder EUS (v.9.4)     cpe:/a:redhat:rhel_eus:9.4::crb
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Red Hat Red Hat CodeReady Linux Builder EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::crb
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)     cpe:/a:redhat:enterprise_linux:9::crb
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Red Hat Red Hat AI Inference Server 3.2     cpe:/a:redhat:ai_inference_server:3.2::el9
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Red Hat Red Hat AI Inference Server 3.3     cpe:/a:redhat:ai_inference_server:3.3::el9
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Red Hat Red Hat Hardened Images     cpe:/a:redhat:hummingbird:1
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Show details on NVD website

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      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-40164\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-04-14T19:08:48.249009Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-04-14T19:23:14.106Z\"}}], \"cna\": {\"title\": \"jq: Algorithmic complexity DoS via hardcoded MurmurHash3 seed\", \"source\": {\"advisory\": \"GHSA-wwj8-gxm6-jc29\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"jqlang\", \"product\": \"jq\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 0c7d133c3c7e37c00b6d46b658a02244fdd3c784\"}]}], \"references\": [{\"url\": \"https://github.com/jqlang/jq/security/advisories/GHSA-wwj8-gxm6-jc29\", \"name\": \"https://github.com/jqlang/jq/security/advisories/GHSA-wwj8-gxm6-jc29\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/jqlang/jq/commit/0c7d133c3c7e37c00b6d46b658a02244fdd3c784\", \"name\": \"https://github.com/jqlang/jq/commit/0c7d133c3c7e37c00b6d46b658a02244fdd3c784\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"jq is a command-line JSON processor. Before commit 0c7d133c3c7e37c00b6d46b658a02244fdd3c784, jq used MurmurHash3 with a hardcoded, publicly visible seed (0x432A9843) for all JSON object hash table operations, which allowed an attacker to precompute key collisions offline. By supplying a crafted JSON object (~100 KB) where all keys hashed to the same bucket, hash table lookups degraded from O(1) to O(n), turning any jq expression into an O(n\\u00b2) operation and causing significant CPU exhaustion. This affected common jq use cases such as CI/CD pipelines, web services, and data processing scripts, and was far more practical to exploit than existing heap overflow issues since it required only a small payload. This issue has been patched in commit 0c7d133c3c7e37c00b6d46b658a02244fdd3c784.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-328\", \"description\": \"CWE-328: Use of Weak Hash\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-407\", \"description\": \"CWE-407: Inefficient Algorithmic Complexity\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-04-13T23:40:12.693Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-40164\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-14T19:27:38.916Z\", \"dateReserved\": \"2026-04-09T19:31:56.014Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-04-13T23:40:12.693Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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