High
jawn — security advisory
Jawn is an open source JSON parser. Prior to 1.7.0, Jawn's AsyncParser can perform quadratic work when a single JSON token is delivered across many small chunks because each absorb call rescans the incomplete token from the start. A remote attacker who controls untrusted JSON input and its chunk sizes can exhaust CPU resources and cause denial of service in applications using AsyncParser. This issue is fixed in version 1.7.0.
- Products
- jawn
- Affected versions
- 0.11.1+really0.6.0-1, 0.11.1+really0.6.0-1build1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-61814
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:39 UTC · Revision 1
Source evidence
Jawn is an open source JSON parser. Prior to 1.7.0, Jawn's AsyncParser can perform quadratic work when a single JSON token is delivered across many small chunks because each absorb call rescans the incomplete token from the start. A remote attacker who controls untrusted JSON input and its chunk sizes can exhaust CPU resources and cause denial of service in applications using AsyncParser. This issue is fixed in version 1.7.0.
osv:UBUNTU-CVE-2026-61814
jawn
Fixed versions: Not specified
jawn
Fixed versions: Not specified
jawn
Fixed versions: Not specified
jawn
Fixed versions: Not specified
jawn
Fixed versions: Not specified
Complete source record
{
"id": "40f1dd3d614ca8dc624ad1e50f1ff010c72e408752abb98da8aeb310ba1823a7",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-61814",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-61814",
"summary": "Jawn is an open source JSON parser. Prior to 1.7.0, Jawn's AsyncParser can perform quadratic work when a single JSON token is delivered across many small chunks because each absorb call rescans the incomplete token from the start. A remote attacker who controls untrusted JSON input and its chunk sizes can exhaust CPU resources and cause denial of service in applications using AsyncParser. This issue is fixed in version 1.7.0.",
"evidence": "osv:UBUNTU-CVE-2026-61814",
"products": [
{
"name": {
"value": "jawn",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.11.1+really0.6.0-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "jawn",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
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"value": "0.11.1+really0.6.0-1",
"evidence": "/affected/1/versions"
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},
{
"name": {
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},
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"affected_versions": [
{
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"evidence": "/affected/2/versions"
}
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{
"name": {
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},
"prerequisites": [],
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"evidence": "/affected/3/versions"
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{
"name": {
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"evidence": "/affected/4/package/name"
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"affected_versions": [
{
"value": "0.11.1+really0.6.0-1",
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},
{
"value": "0.11.1+really0.6.0-1build1",
"evidence": "/affected/4/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-61814",
"aliases": [
"UBUNTU-CVE-2026-61814"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
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"purl": "pkg:deb/ubuntu/jawn?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"0.11.1+really0.6.0-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61814.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libjawn-java",
"binary_version": "0.11.1+really0.6.0-1"
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},
{
"ranges": [
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"package": {
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"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"0.11.1+really0.6.0-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61814.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libjawn-java",
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]
}
},
{
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],
"package": {
"name": "jawn",
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"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"0.11.1+really0.6.0-1"
],
"database_specific": {
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},
"ecosystem_specific": {
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{
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"package": {
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"ecosystem": "Ubuntu:26.10"
},
"versions": [
"0.11.1+really0.6.0-1build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61814.json"
},
"ecosystem_specific": {
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}
},
{
"ranges": [
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"type": "ECOSYSTEM",
"events": [
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}
]
}
],
"package": {
"name": "jawn",
"purl": "pkg:deb/ubuntu/jawn?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"0.11.1+really0.6.0-1",
"0.11.1+really0.6.0-1build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61814.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libjawn-java",
"binary_version": "0.11.1+really0.6.0-1build1"
}
]
}
}
],
"modified": "2026-10-17T12:57:17.021254338Z",
"provider": "osv",
"upstream": [
"CVE-2026-61814"
],
"references": [
"https://ubuntu.com/security/CVE-2026-61814",
"https://www.cve.org/CVERecord?id=CVE-2026-61814",
"https://github.com/typelevel/jawn/commit/cddcd5e3387c356b05953f7b2af103d309687e4b",
"https://github.com/typelevel/jawn/releases/tag/v1.7.0",
"https://github.com/typelevel/jawn/security/advisories/GHSA-w4cm-gvhj-cgw6"
]
},
"related_cves": [
{
"value": "CVE-2026-61814",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 357093,
"published_at": "2026-09-23T19:17:00+00:00"
}