Vulnerability database
Every flaw the U.S. government’s cybersecurity agency (CISA) has confirmed attackers are using, plus the new WordPress plugin and theme bugs published each day, sorted by what they mean for a small business. We refresh it twice a day. If you see something your website or office runs, tell us.
9 results
Sep 1, 2026js-yaml is a JavaScript YAML parser and dumper.CVE-2026-84375 · Other software · nodeca · reported by GitHubHigh 7.5
js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 until 3.15.2, 4.3.2, and 5.4.1, maxTotalMergeKeys in lib/js-yaml/loader.js and lib/loader.js does not count empty mapping sources while processing the merge key <<. An attacker can alias a large sequence of empty mappings into many merge targets, causing O(N * K) processing while totalMergeKeys remains unchanged and the configured resource limit is never reached. A relatively small YAML document can therefore cause prolonged CPU consumption in applications that parse untrusted YAML, and merge processing is enabled by default on these release lines. In v3 & v4, merge is enabled by default so the severity score is higher. This issue is fixed in versions 3.15.2, 4.3.2, and 5.4.1.
- Product
- js-yaml
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 13, 2026js-yaml is a JavaScript YAML parser and dumper.CVE-2026-73643 · Other software · nodeca · reported by GitHubHigh 7.5
js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 until 5.2.2, parsing a small YAML document can take exponential time when an application calls load() or loadAll() on untrusted input. In src/parser/parser.ts, readFlowCollection uses restoreState and calls parseNode a second time when a flow-sequence entry is recognized as a key: value pair. If the key is a nested flow sequence of the same shape, every level is parsed twice, causing O(2^n) work and allowing an input under 200 bytes to keep one CPU busy for minutes, block the Node.js event loop, and stall the process. No anchors, aliases, merges, tags, or nondefault options are required. This issue is fixed in version 5.2.2.
- Product
- js-yaml
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 8, 2026js-yaml is a JavaScript YAML parser and dumper.CVE-2026-59870 · Other software · nodeca · reported by GitHubHigh 7.5
js-yaml is a JavaScript YAML parser and dumper. Prior to 3.15.1, 4.3.1, and 5.2.1, YAML11_SCHEMA 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 O(n^2) CPU consumption when yaml.load() parses a crafted ordered-map document. In v3 and v4, !!omap is active and exploitable by default. v5 doesn't use !!omap by default, and the chances of activating it are very low.This issue is fixed in 3.15.1, 4.3.1, and 5.2.1.
- Product
- js-yaml
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 8, 2026js-yaml is a JavaScript YAML parser and dumper.CVE-2026-59869 · Other software · nodeca · reported by GitHubHigh 7.5
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 versions 3.15.0 and 4.3.0.
- Product
- js-yaml
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 8, 2026js-yaml is a JavaScript YAML parser and dumper.CVE-2026-59868 · Other software · nodeca · reported by GitHubMedium 5.3
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 version 5.2.0.
- Product
- js-yaml
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jun 22, 2026js-yaml is a JavaScript YAML parser and dumper.CVE-2026-53550 · Other software · nodeca · reported by GitHubMedium 5.3
js-yaml is a JavaScript YAML parser and dumper. Prior to 4.2.0 and 3.15.0, a crafted YAML document can trigger algorithmic CPU exhaustion in js-yaml merge-key processing (<<) by repeating the same alias many times in a merge sequence. This causes quadratic parse-time behavior relative to input size and can block a Node.js worker/event loop for seconds with a relatively small payload (tens of KB), resulting in denial of service. The issue is in merge handling inside lib/loader.js. This vulnerability is fixed in 4.2.0 and 3.15.0.
- Product
- js-yaml
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Nov 13, 2025js-yaml is a JavaScript YAML parser and dumper.CVE-2025-64718 · Other software · nodeca · reported by GitHubMedium 5.3
js-yaml is a JavaScript YAML parser and dumper. In js-yaml before 4.1.1 and 3.14.2, it's possible for an attacker to modify the prototype of the result of a parsed yaml document via prototype pollution (`__proto__`). All users who parse untrusted yaml documents may be impacted. The problem is patched in js-yaml 4.1.1 and 3.14.2. Users can protect against this kind of attack on the server by using `node --disable-proto=delete` or `deno` (in Deno, pollution protection is on by default).
- Product
- js-yaml
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 2, 2020All versions of package shiba are vulnerable to Arbitrary Code Execution due to the default usage of the function load() of the package js-yaml instead of its sCVE-2020-7738 · Other software · Shiba Project · reported by report@snyk.ioHigh 8.3
All versions of package shiba are vulnerable to Arbitrary Code Execution due to the default usage of the function load() of the package js-yaml instead of its secure replacement , safeLoad().
- Product
- Shiba
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jun 28, 2013The JS-YAML module before 2.0.5 for Node.js parses input without properly considering the unsafe !!js/function tag, which allows remote attackers to execute arbCVE-2013-4660 · Other software · Nodeca · reported by MITREMedium 6.8
The JS-YAML module before 2.0.5 for Node.js parses input without properly considering the unsafe !!js/function tag, which allows remote attackers to execute arbitrary code via a crafted string that triggers an eval operation.
- Product
- Js-yaml
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordportal.nodesecurity.ionealpoole.com
Where this comes from: the exploited list is CISA’s Known Exploited Vulnerabilities catalog. Everything else is the whole National Vulnerability Database, where each record is published by the team that found the bug (Wordfence, Patchstack, WPScan, the vendors themselves and others); we show who. Exploit odds are FIRST’s EPSS, updated daily. Titles and categories are ours, so check the linked record before acting on a detail. For a write-up of the big ones, see our advisories. Every vendor, and every WordPress plugin and theme with a recorded flaw, also has its own page. All of it is free to reuse as JSON, CSV or RSS.
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