290 lines
12 KiB
JSON
290 lines
12 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveId": "CVE-2026-66046",
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"state": "PUBLISHED",
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"dateReserved": "2026-07-23T20:45:17.817Z",
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},
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"datePublic": "2026-08-13T00:00:00.000Z",
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"title": "Expat Denial of Service via storeAtts() Quadratic Complexity",
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"descriptions": [
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{
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"lang": "en",
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"value": "Expat through 2.8.3 contains a denial of service vulnerability caused by quadratic algorithmic complexity in the storeAtts() function in xmlparse.c, where processing N specified attributes with non-normalized values triggers an O(N^2) linear scan of elementType->defaultAtts to determine CDATA status. A remote unauthenticated attacker can supply a single well-formed XML document of a few megabytes to an application parsing untrusted XML to cause excessive CPU consumption, resulting in denial of service without requiring authentication, external entity resolution, or non-default parser options."
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}
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],
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"descriptions": [
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{
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"lang": "en",
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"cweId": "CWE-407",
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"description": "Inefficient Algorithmic Complexity",
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"type": "CWE"
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}
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{
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"vendor": "libexpat project",
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"packageURL": "pkg:github/libexpat/libexpat",
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"repo": "https://github.com/libexpat/libexpat",
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{
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"status": "affected",
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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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"scenarios": [
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{
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"lang": "en",
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"value": "GENERAL"
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}
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"cvssV4_0": {
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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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"subConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "NONE",
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"subIntegrityImpact": "NONE",
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"vulnAvailabilityImpact": "HIGH",
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"subAvailabilityImpact": "NONE",
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"exploitMaturity": "NOT_DEFINED",
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"Safety": "NOT_DEFINED",
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"Automatable": "NOT_DEFINED",
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"Recovery": "NOT_DEFINED",
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"valueDensity": "NOT_DEFINED",
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"vulnerabilityResponseEffort": "NOT_DEFINED",
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"providerUrgency": "NOT_DEFINED",
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"version": "4.0",
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"baseSeverity": "HIGH",
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"baseScore": 8.7,
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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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}
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},
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{
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"format": "CVSS",
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"scenarios": [
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{
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"lang": "en",
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}
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],
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"cvssV3_1": {
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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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"version": "3.1",
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"baseSeverity": "HIGH",
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"baseScore": 7.5,
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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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}
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],
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"references": [
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{
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"url": "https://github.com/libexpat/libexpat/pull/1321",
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"name": "Pull Request",
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"tags": [
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"issue-tracking",
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"patch"
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]
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},
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{
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"url": "https://www.vulncheck.com/advisories/expat-denial-of-service-via-storeatts-quadratic-complexity",
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"tags": [
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"third-party-advisory"
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]
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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": "Fabian Wahle (Hap Security)",
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"type": "finder"
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},
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{
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"lang": "en",
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"value": "Sebastian Pipping",
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"type": "remediation developer"
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},
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{
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"lang": "en",
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"value": "VulnCheck",
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"type": "coordinator"
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}
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"source": {
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"discovery": "UNKNOWN"
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"x_generator": {
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"engine": "vulncheck"
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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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"timestamp": "2026-08-20T13:48:24.577412Z",
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"id": "CVE-2026-66046",
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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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"role": "CISA Coordinator",
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"version": "2.0.3"
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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": "2026-08-20T15:24:17.474Z"
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}
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{
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"x_adpType": "supplier",
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"shortName": "siemens-SADP",
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"dateUpdated": "2026-11-10T12:49:37.975Z"
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},
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"affected": [
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{
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"vendor": "Siemens",
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"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)",
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"versions": [
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{
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} |