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
Assigner: GitHub_M
Published: Sep 23, 2026, 6:39:01 PM
Updated: Sep 23, 2026, 7:41:40 PM
EUVD base score (CVSS 3.1): 7.5 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EUVD-reported EPSS: 0.0000
Vendors: typelevel, org.typelevel
Products: jawn-parser_2.13 (< 1.7.0)

jawn-parser_3 (< 1.7.0)

jawn (< 1.7.0)

jawn-parser_2.12 (< 1.7.0)
Aliases: GHSA-w4cm-gvhj-cgw6

ENISA 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.

EUVD references (3)

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

Remediations (10)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

CVE-2026-69414 ShieldBreak Zero-Day: No Patch, and CISA BOD 26-04 Gives ...

web:blog.qualys.com

What can I do before Microsoft releases a patch ? Qualys TruRisk™ Eliminate provides a recommended mitigation for CVE - 2026 -69414 that can be applied to affected systems while Microsoft works on a fix . Assets can then be reassessed in Qualys VMDR to verify the remediation outcome.

2026-09-24 11:21 UTC
CISA Requires Federal Agencies to Patch Critical Vulnerabilities Within ...

web:cybersecuritynews.com

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has issued Binding Operational Directive (BOD) 26-04, titled "Prioritizing Security Updates Based on Risk," compelling all Federal Civilian Executive Branch (FCEB) agencies to remediate the most dangerous known exploited vulnerabilities within just three calendar days.

2026-09-24 11:21 UTC
Security Update Guide - Microsoft

web:msrc.microsoft.com

The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.

2026-09-24 11:21 UTC
Microsoft Patch Tracker (September 2026): Exploit-Ranked | Senserva

web:senserva.com

Every Microsoft security patch (KB) and the CVEs it fixes, with severity, CVSS, and CISA KEV status. Cross-linked to the CVE reference.

2026-09-24 11:21 UTC
Defender ShieldBreak Zero-Day CVE-2026-69414 [2026]

web:tech-insider.org

A proof-of-concept exploit published on August 12, 2026 undid Microsoft's fix for a Defender privilege-escalation bug just one day after that month's Patch Tuesday, handing attackers a working path back to SYSTEM-level access on fully patched Windows 11 25H2 and Windows Server 2025 machines. The bypass, tracked as CVE - 2026 -69414 and nicknamed ShieldBreak, targets the same Malware ...

2026-09-24 11:21 UTC
Microsoft Patch Tuesday, July 2026 Security Update Review

web:threatprotect.qualys.com

Microsoft's July 2026 Patch Tuesday delivers security updates for a broad range of products and services, including several vulnerabilities that pose significant risks to enterprise environments.

2026-09-24 11:21 UTC
Critical Patches Issued for Microsoft Products, July 14, 2026

web:www.cisecurity.org

Microsoft reports CVE - 2026 -56164 has been exploited in the wild. CVE - 2026 -56164 may allow remote cyber threat actors to gain unauthorized access to on-premises SharePoint Server instances. Microsoft noted that integrating its Antimalware Scan Interface (AMSI) can provide temporary mitigation by actively scanning and detecting malicious POST requests associated with exploitation attempts. The ...

2026-09-24 11:21 UTC
July 2026 Patch Tuesday: Updates and Analysis | CrowdStrike

web:www.crowdstrike.com

Microsoft has released security updates for 622 vulnerabilities in its July 2026 Patch Tuesday rollout.

2026-09-24 11:21 UTC
Oracle Critical Patch Update Advisory - July 2026

web:www.oracle.com

This Critical Patch Update contains 1448 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-24 11:21 UTC
July 2026 Patch Tuesday: Largest Patch Tuesday 569 CVEs - Tenable

web:www.tenable.com

Microsoft patched 569 CVEs in July 2026 , the largest Patch Tuesday release in its history. 56 critical CVEs patched including three zero-day vulnerabilities.

2026-09-24 11:21 UTC

AI Forensic Analysis

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Raw JSON

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

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