CVE-2026-61814

Jawn: Quadratic parsing effort in AsyncParser

CVSS 3.1 7.5 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-61814

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-61814

Published

jawn

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "typelevel",
                    "product": "jawn",
                    "versions": [
                        {
                            "version": "< 1.7.0",
                            "status": "affected"
                        }
                    ]
                }

jawn-parser_2.12

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "org.typelevel",
                    "product": "jawn-parser_2.12",
                    "versions": [
                        {
                            "version": "< 1.7.0",
                            "status": "affected"
                        }
                    ]
                }

jawn-parser_2.13

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "org.typelevel",
                    "product": "jawn-parser_2.13",
                    "versions": [
                        {
                            "version": "< 1.7.0",
                            "status": "affected"
                        }
                    ]
                }

jawn-parser_3

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "org.typelevel",
                    "product": "jawn-parser_3",
                    "versions": [
                        {
                            "version": "< 1.7.0",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON