180 lines
7.5 KiB
JSON
180 lines
7.5 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-86434",
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"assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
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"state": "PUBLISHED",
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"assignerShortName": "VulnCheck",
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"dateReserved": "2026-09-07T12:34:31.457Z",
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"datePublished": "2026-09-07T12:53:53.194Z",
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"dateUpdated": "2026-10-08T15:25:54.536Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
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"shortName": "VulnCheck",
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"dateUpdated": "2026-10-08T15:25:54.536Z"
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},
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"datePublic": "2026-08-03T00:00:00.000Z",
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"title": "commonmark 2.0.0 through 2.8.3 Denial of Service via Slug Collision",
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"descriptions": [
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{
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"lang": "en",
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"value": "league/commonmark versions >= 2.0.0 and < 2.8.4 (patched in 2.9.0) contain a denial of service vulnerability in UniqueSlugNormalizer::normalize(), which restarts its numeric-suffix search from 1 on every slug collision, resulting in O(K^2) time complexity for K headings that collapse to the same base slug. The vulnerable path is reached when HeadingPermalinkExtension, FootnoteExtension, or TableOfContentsExtension is registered. An unauthenticated attacker can force many headings onto a single base slug (e.g., via empty ATX headings, identical heading text, or punctuation-only headings) in a small Markdown document, consuming excessive CPU and denying service."
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"description": "Inefficient Algorithmic Complexity",
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"cweId": "CWE-407",
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"type": "CWE"
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}
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]
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}
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],
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"affected": [
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{
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"vendor": "thephpleague",
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"product": "commonmark",
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"defaultStatus": "unaffected",
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"versions": [
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{
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"version": "2.0.0",
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"status": "affected",
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"versionType": "semver",
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"lessThan": "2.8.4"
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},
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{
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"version": "2.8.4",
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"status": "unaffected",
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"versionType": "semver"
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}
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],
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"packageURL": "pkg:composer/league/commonmark"
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:a:thephpleague:commonmark:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.0.0",
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"versionEndExcluding": "2.8.4"
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}
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]
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}
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]
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}
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],
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"metrics": [
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{
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"format": "CVSS",
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"cvssV4_0": {
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"version": "4.0",
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"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
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"attackVector": "NETWORK",
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"attackComplexity": "LOW",
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"attackRequirements": "NONE",
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"privilegesRequired": "NONE",
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"userInteraction": "NONE",
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"vulnConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "NONE",
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"vulnAvailabilityImpact": "HIGH",
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"subConfidentialityImpact": "NONE",
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"subIntegrityImpact": "NONE",
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"subAvailabilityImpact": "NONE",
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"baseScore": 8.7,
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"baseSeverity": "HIGH"
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}
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},
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{
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"format": "CVSS",
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"attackVector": "NETWORK",
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"attackComplexity": "LOW",
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"privilegesRequired": "NONE",
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"userInteraction": "NONE",
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"scope": "UNCHANGED",
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"confidentialityImpact": "NONE",
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"integrityImpact": "NONE",
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"availabilityImpact": "HIGH",
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"baseScore": 7.5,
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"baseSeverity": "HIGH"
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}
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}
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],
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"references": [
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{
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"url": "https://github.com/thephpleague/commonmark/security/advisories/GHSA-mh25-x5hq-wrqp",
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"tags": [
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"vendor-advisory"
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],
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"name": "GitHub Security Advisory (GHSA-mh25-x5hq-wrqp)"
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},
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{
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"name": "VulnCheck Advisory: commonmark 2.0.0 through 2.8.3 Denial of Service via Slug Collision",
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"tags": [
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"third-party-advisory"
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],
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"url": "https://www.vulncheck.com/advisories/commonmark-2.0.0-through-2.8.3-denial-of-service-via-slug-collision"
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}
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],
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"credits": [
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{
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"lang": "en",
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"value": "GrahamCampbell",
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"type": "finder"
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}
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],
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"x_generator": {
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"engine": "vulncheck-endgame"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-86434",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-09-18T17:42:05.970571Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-09-19T14:21:56.985Z"
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}
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}
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]
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}
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} |