chore(deps): update dependency yaml to v2.8.3 [security]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
yaml (source)	2.2.1 → 2.8.3

GitHub Vulnerability Alerts

CVE-2023-2251

Uncaught Exception in GitHub repository eemeli/yaml starting at version 2.0.0-5 and prior to 2.2.2.

CVE-2026-33532

Parsing a YAML document with yaml may throw a RangeError due to a stack overflow.

The node resolution/composition phase uses recursive function calls without a depth bound. An attacker who can supply YAML for parsing can trigger a RangeError: Maximum call stack size exceeded with a small payload (~2–10 KB). The RangeError is not a YAMLParseError, so applications that only catch YAML-specific errors will encounter an unexpected exception type. Depending on the host application's exception handling, this can fail requests or terminate the Node.js process.

Flow sequences allow deep nesting with minimal bytes (2 bytes per level: one [ and one ]). On the default Node.js stack, approximately 1,000–5,000 levels of nesting (2–10 KB input) exhaust the call stack. The exact threshold is environment-dependent (Node.js version, stack size, call stack depth at invocation).

Note: the library's Parser (CST phase) uses a stack-based iterative approach and is not affected. Only the compose/resolve phase uses actual call-stack recursion.

All three public parsing APIs are affected: YAML.parse(), YAML.parseDocument(), and YAML.parseAllDocuments().

PoC

const YAML = require('yaml');

// ~10 KB payload: 5000 levels of nested flow sequences
const payload = '['.repeat(5000) + '1' + ']'.repeat(5000);

try {
  YAML.parse(payload);
} catch (e) {
  console.log(e.constructor.name); // RangeError (NOT YAMLParseError)
  console.log(e.message);          // Maximum call stack size exceeded
}

Test environment: Node.js v24.12.0, macOS darwin arm64

Version	Nesting Depth	Input Size	Result
1.0.0	5,000	10,001 B	RangeError
1.10.2	5,000	10,001 B	RangeError
2.0.0	5,000	10,001 B	RangeError
2.8.2	5,000	10,001 B	RangeError
2.8.3	5,000	10,001 B	YAMLParseError

Depth threshold on yaml 2.8.2:

Nesting Depth	Input Size	Result
500	1,001 B	Parses successfully
1,000	2,001 B	RangeError (threshold varies by stack size)
5,000	10,001 B	RangeError

---

Release Notes

eemeli/yaml (yaml)

v2.8.3

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v2.8.2

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v2.8.1

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• Preserve empty block literals (#​634)

v2.8.0

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• Add node cache for faster alias resolution (#​612)
• Re-introduce compatibility with Node.js 14.6 (#​614)
• Add --merge option to CLI tool (#​611)
• Improve error for tag resolution error on null value (#​616)
• Allow empty string as plain scalar representation, for failsafe schema (#​616)
• docs: include cli example (#​617)

v2.7.1

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• Do not allow seq with single-line collection value on same line with map key (#​603)
• Improve warning & avoid TypeError on bad YAML 1.1 nodes (#​610)

v2.7.0

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The library is now available on JSR as @​eemeli/yaml and on deno.land/x as yaml. In addition to Node.js and browsers, it should work in Deno, Bun, and Cloudflare Workers.

• Use .ts extension in all relative imports (#​591)
• Ignore newline after block seq indicator as space before value (#​590)
• Require Node.js 14.18 or later (was 14.6) (#​598)

v2.6.1

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• Do not strip :00 seconds from !!timestamp values (#​578, with thanks to @​qraynaud)
• Tighten regexp for JSON !!bool (#​587, with thanks to @​vra5107)
• Default to literal block scalar if folded would overflow (#​585)

v2.6.0

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• Use a proper tag for !!merge << keys (#​580)
• Add stringKeys parse option (#​581)
• Stringify a Document as a Document (#​576)
• Add sponsorship by Manifest

v2.5.1

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• Include range in flow sequence pair maps (#​573)

v2.5.0

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• Add --indent option to CLI tool (#​559, with thanks to @​danielbayley)
• Require newline in all cases for props on block sequence (#​557)
• Always reset indentation in lexer on ... (#​558)
• Ignore minContentWidth if greater than lineWidth (#​562)
• Drop unused Collection.maxFlowStringSingleLineLength (#​522, #​421)

v2.4.5

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• Improve tab handling (#​553, yaml-test-suite tests DK95 & Y79Y)

v2.4.4

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With special thanks to @​RedCMD for finding and reporting all of the following:

• Allow comment after top-level block scalar with explicit indent indicator (#​547)
• Allow tab as indent for line comments before nodes (#​548)
• Do not allow tab before block collection (#​549)
• In flow collections, allow []{} immediately after : with plain key (#​550)
• Require indentation for ? explicit-key contents (#​551)
• Require indentation from block scalar header & flow collections in mapping values (#​553)

v2.4.3

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• Improve error when parsing a non-string value (#​459)
• Do not parse -.NaN or +.nan as NaN (#​546)
• Support # within %TAG prefixes with trailing #comments
• Check for non-node complex keys when stringifying with simpleKeys (#​541)

v2.4.2

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• Restrict YAML 1.1 boolean strings to their explicit capitalization (#​530)
• Add sponsorship by Scipress (#​536)

v2.4.1

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• cst: Do not drop trailing newline after line comment in block-map if followed by unindented block-seq value (#​525)
• Stringify flow collection comments in parent (#​528)
• Do not skip folding lines after the first in indented block scalars (#​529)

v2.4.0

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• Add a command-line tool (#​523)
• Use the lineWidth option for line breaking in flow collections (#​522)

v2.3.4

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• Do not throw for carriage return in tag shorthand (#​501)

v2.3.3

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• Do not throw error on malformed URI escape in tag (#​498)

v2.3.2

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• Fix docs typo (#​489)
• Do not require quotes for implicit keys with flow indicators (#​494)
• Update Prettier to v3 & update ESLint config

v2.3.1

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• Drop npm from package.json "engines" config (#​476)

v2.3.0

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This release corresponds with the release of yaml-types v0.2.0, an expanding library of custom tags or types for use with yaml.

This release contains no changes from v2.3.0-5, and the notes below include all changes from the v2.3.0-x prereleases.

Custom Tag Improvements

• Add export of createNode() & createPair() to 'yaml/util' (#​457)
• Add static from() methods to simplify tag development, and otherwise make extending custom collections easier (#​467)

TypeScript Improvements

• Add a second optional generic type argument Strict to Document instances. (#​441)
• Add types exports for TypeScript (#​463)
• Export StringifyContext type from 'yaml/util' (#​464)

Other New Features

• Add a toJS(doc, options?) method to nodes (#​451, #​458)
• Set explicit tag during createNode() for non-default tags (#​464)

Bugfixes

• Use correct argument order when stringifying flow collection comments (#​443)
• Improve first-line folding for block scalars (#​422)

v2.2.2

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This patch release includes a fix for an error that could be thrown in parseDocument for degenerate input. Otherwise, it's a patch release uplifting a few fixes from the ongoing v2.3 work to v2.2:

• Corner case failure in error pretty-printer (CVE-2023-2251)
• Use correct argument order when stringifying flow collection comments (#​443)
• First-line folding for block scalars (#​422)

---

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