CVE-2026-59868 js-yaml: YAML merge-key chains can force quadratic CPU consumption

js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.0, when merge keys are enabled, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This issue is fixed in...

CVE-2026-59869 js-yaml: YAML merge-key chains can force quadratic CPU consumption

js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 before 3.15.0 and from 4.0.0 before 4.3.0, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This issue is fixed in...

CVE-2026-59869

js-yaml (JavaScript YAML parser) is affected by a resource-consumption issue in merge-key chains that can cause quadratic CPU time as documents grow linearly. Affected versions are 3.0.0–3.14.x and 4.0.0–4.2.x; the issue is fixed in 3.15.0 and 4.3.0. Impact is described as high availability (A:H)...

CVE-2026-59870

js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.1, YAML11SCHEMA support for the !!omap tag in src/tag/sequence/omap.ts uses omapTag.addItem to perform a linear duplicate-key scan on every insertion, causing On^2 CPU consumption when yaml.load parses a crafted ordered-map...

CVE-2026-59868: Inefficient Algorithmic Complexity

js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.0, when merge keys are enabled, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This issue is fixed in...

CVE-2026-59869: Inefficient Algorithmic Complexity

js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 before 3.15.0 and from 4.0.0 before 4.3.0, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This issue is fixed in...

CVE-2026-48511

MessagePack for C is a MessagePack serializer for C. Prior to 2.5.301 and 3.1.7, ExpandoObjectFormatter.Deserialize populates System.Dynamic.ExpandoObject by calling IDictionary.Add for each map entry. ExpandoObject internally maintains member names in array-like structures, so inserting many...

PT-2026-51395

Name of the Vulnerable Software and Affected Versions MessagePack for C versions prior to 2.5.301 MessagePack for C versions prior to 3.1.7 Description The ExpandoObjectFormatter.Deserialize function populates System.Dynamic.ExpandoObject by calling IDictionary.Add for each map entry. Because...

CVE-2026-48511: Inefficient Algorithmic Complexity

MessagePack for C is a MessagePack serializer for C. Prior to 2.5.301 and 3.1.7, ExpandoObjectFormatter.Deserialize populates System.Dynamic.ExpandoObject by calling IDictionary .Add for each map entry. ExpandoObject internally maintains member names in array-like structures, so inserting many...

js-yaml: js-yaml: Denial of Service via quadratic CPU time parsing with merge keys

A flaw was found in js-yaml, a JavaScript YAML parser and dumper. When merge keys are enabled, a remote attacker could exploit this vulnerability by crafting a YAML document where a chain of mappings uses merge keys, each merging the previous one. This can lead to a significant increase in CPU ti...

tornado: Tornado Quadratic DoS via Crafted Multipart Parameters

A denial of service flaw has been discovered in the Tornado networking library. Affected versions of Tornado us an inefficient algorithm when parsing parameters for HTTP header values, potentially causing a DoS. The parseparam function in httputil.py is used to parse specific HTTP header values,...

tornado: Tornado Quadratic DoS via Crafted Multipart Parameters

A denial of service flaw has been discovered in the Tornado networking library. Affected versions of Tornado us an inefficient algorithm when parsing parameters for HTTP header values, potentially causing a DoS. The parseparam function in httputil.py is used to parse specific HTTP header values,...

AZL-47860 CVE-2024-7592 affecting package python3 for versions less than 3.9.19-4

There is a LOW severity vulnerability affecting CPython, specifically the 'http.cookies' standard library module. When parsing cookies that contained backslashes for quoted characters in the cookie value, the parser would use an algorithm with quadratic complexity, resulting in excess CPU resourc...