CVE-2026-61814

Description

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.

Overview

State: PUBLISHED
Assigner (CNA): GitHub_M
CVSS severity: HIGH
CVSS score: 7.5 / 10
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Effective score: 7.5 / 10 HIGH source: CNA overview
CWE(s): CWE-400, CWE-407
Reserved: 2026-07-10
Published: 2026-09-23 18:39 UTC
Last updated: 2026-09-23 19:41 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/61xxx/CVE-2026-61814.json
Linked Threat: CVE-2026-61814 — Jawn: Quadratic parsing effort in AsyncParser

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-09-23 19:17:32 UTC
NVD last modified: 2026-09-23 20:17:12 UTC
NVD CVSS v3.1: 7.5 / 10 HIGH source: security-advisories@github.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploitability subscore: 3.9 / 10
Impact subscore: 3.6 / 10

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-85551

EUVD enrichment is queued; refresh the page in a few seconds.

Affected products (4)

Vendor	Product	Versions	Platforms
typelevel	jawn	`< 1.7.0` (affected)	—
org.typelevel	jawn-parser_2.12	`< 1.7.0` (affected)	—
org.typelevel	jawn-parser_2.13	`< 1.7.0` (affected)	—
org.typelevel	jawn-parser_3	`< 1.7.0` (affected)	—

Vendor references (3)

References embedded in the original CVE record by the assigning CNA.

https://github.com/typelevel/jawn/security/advisories/GHSA-w4cm-gvhj-cgw6 x_refsource_CONFIRM
https://github.com/typelevel/jawn/commit/cddcd5e3387c356b05953f7b2af103d309687e4b x_refsource_MISC
https://github.com/typelevel/jawn/releases/tag/v1.7.0 x_refsource_MISC

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (3)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://github.com/typelevel/jawn/commit/cddcd5e3387c356b05953f7b2af103d309687e4b security-advisories@github.com
https://github.com/typelevel/jawn/releases/tag/v1.7.0 security-advisories@github.com
https://github.com/typelevel/jawn/security/advisories/GHSA-w4cm-gvhj-cgw6 security-advisories@github.com

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-61814.json.

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                  },
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                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-23T19:25:56.569425Z",
                "version": "2.0.3"
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