CVE-2026-102278 (GCVE-0-2026-102278)
Vulnerability from cvelistv5 – Published: 2026-09-28 20:57 – Updated: 2026-09-28 20:57
VLAI
EPSS
VEX
Title
brace-expansion: DoS via uncontrolled recursion on nested brace groups causing stack exhaustion
Summary
The brace-expansion library generates arbitrary strings containing a common prefix and suffix. Prior to 1.1.20, 2.1.6, 3.0.8, and 5.0.11, deeply nested brace groups cause expand_() to recurse once per nesting level at comma-member and single-set expansion sites, exhausting the native stack before output limits can apply and potentially terminating the Node.js process. expand_ performs uncontrolled recursion for nested brace alternatives and single-part sets. deeply nested brace groups supplied as an untrusted pattern. expand_ is affected. expand is affected. Comma members is affected. Single set is affected. native stack exhaustion during nested sub-expansion. process-terminating denial of service. This issue is fixed in versions 1.1.20, 2.1.6, 3.0.8, and 5.0.11.
Severity
7.5 (High)
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/juliangruber/brace-expansion/s… | x_refsource_CONFIRM |
| https://github.com/juliangruber/brace-expansion/c… | x_refsource_MISC |
| https://github.com/juliangruber/brace-expansion/c… | x_refsource_MISC |
| https://github.com/juliangruber/brace-expansion/c… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| juliangruber | brace-expansion |
Affected:
>= 4.0.0, < 5.0.11
Affected: >= 3.0.0, < 3.0.8 Affected: >= 2.0.0, < 2.1.6 Affected: < 1.1.20 |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"product": "brace-expansion",
"vendor": "juliangruber",
"versions": [
{
"status": "affected",
"version": "\u003e= 4.0.0, \u003c 5.0.11"
},
{
"status": "affected",
"version": "\u003e= 3.0.0, \u003c 3.0.8"
},
{
"status": "affected",
"version": "\u003e= 2.0.0, \u003c 2.1.6"
},
{
"status": "affected",
"version": "\u003c 1.1.20"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "The brace-expansion library generates arbitrary strings containing a common prefix and suffix. Prior to 1.1.20, 2.1.6, 3.0.8, and 5.0.11, deeply nested brace groups cause expand_() to recurse once per nesting level at comma-member and single-set expansion sites, exhausting the native stack before output limits can apply and potentially terminating the Node.js process. expand_ performs uncontrolled recursion for nested brace alternatives and single-part sets. deeply nested brace groups supplied as an untrusted pattern. expand_ is affected. expand is affected. Comma members is affected. Single set is affected. native stack exhaustion during nested sub-expansion. process-terminating denial of service. This issue is fixed in versions 1.1.20, 2.1.6, 3.0.8, and 5.0.11."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
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"description": "CWE-400: Uncontrolled Resource Consumption",
"lang": "en",
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}
]
},
{
"descriptions": [
{
"cweId": "CWE-674",
"description": "CWE-674: Uncontrolled Recursion",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-28T20:57:09.850Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/juliangruber/brace-expansion/security/advisories/GHSA-qhr7-859c-m2p7",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/juliangruber/brace-expansion/security/advisories/GHSA-qhr7-859c-m2p7"
},
{
"name": "https://github.com/juliangruber/brace-expansion/commit/1efee7c397c191da6287a78ec19512476a966a7b",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/juliangruber/brace-expansion/commit/1efee7c397c191da6287a78ec19512476a966a7b"
},
{
"name": "https://github.com/juliangruber/brace-expansion/commit/935d78f32f335b2ff76578e5c5e877d31ae9888c",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/juliangruber/brace-expansion/commit/935d78f32f335b2ff76578e5c5e877d31ae9888c"
},
{
"name": "https://github.com/juliangruber/brace-expansion/commit/de84f144e9816f30e25fc8179e2e1249ab6df0db",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/juliangruber/brace-expansion/commit/de84f144e9816f30e25fc8179e2e1249ab6df0db"
}
],
"source": {
"advisory": "GHSA-qhr7-859c-m2p7",
"discovery": "UNKNOWN"
},
"title": "brace-expansion: DoS via uncontrolled recursion on nested brace groups causing stack exhaustion"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-102278",
"datePublished": "2026-09-28T20:57:09.850Z",
"dateReserved": "2026-09-28T20:11:16.659Z",
"dateUpdated": "2026-09-28T20:57:09.850Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-102278",
"date": "2026-09-30",
"epss": "0.0035",
"percentile": "0.2625"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"product": "brace-expansion",
"vendor": "juliangruber",
"versions": [
{
"status": "affected",
"version": "\u003e= 4.0.0, \u003c 5.0.11"
},
{
"status": "affected",
"version": "\u003e= 3.0.0, \u003c 3.0.8"
},
{
"status": "affected",
"version": "\u003e= 2.0.0, \u003c 2.1.6"
},
{
"status": "affected",
"version": "\u003c 1.1.20"
}
]
}
],
"source": "security-advisories@github.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "The brace-expansion library generates arbitrary strings containing a common prefix and suffix. Prior to 1.1.20, 2.1.6, 3.0.8, and 5.0.11, deeply nested brace groups cause expand_() to recurse once per nesting level at comma-member and single-set expansion sites, exhausting the native stack before output limits can apply and potentially terminating the Node.js process. expand_ performs uncontrolled recursion for nested brace alternatives and single-part sets. deeply nested brace groups supplied as an untrusted pattern. expand_ is affected. expand is affected. Comma members is affected. Single set is affected. native stack exhaustion during nested sub-expansion. process-terminating denial of service. This issue is fixed in versions 1.1.20, 2.1.6, 3.0.8, and 5.0.11."
}
],
"id": "CVE-2026-102278",
"lastModified": "2026-09-30T19:57:08.043",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "security-advisories@github.com",
"type": "Secondary"
}
]
},
"published": "2026-09-28T21:17:16.517",
"references": [
{
"source": "security-advisories@github.com",
"url": "https://github.com/juliangruber/brace-expansion/commit/1efee7c397c191da6287a78ec19512476a966a7b"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/juliangruber/brace-expansion/commit/935d78f32f335b2ff76578e5c5e877d31ae9888c"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/juliangruber/brace-expansion/commit/de84f144e9816f30e25fc8179e2e1249ab6df0db"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/juliangruber/brace-expansion/security/advisories/GHSA-qhr7-859c-m2p7"
}
],
"sourceIdentifier": "security-advisories@github.com",
"vulnStatus": "Deferred",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-400"
},
{
"lang": "en",
"value": "CWE-674"
}
],
"source": "security-advisories@github.com",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-09-30T16:08:54+00:00",
"cve": "CVE-2026-102278",
"id": "CVE-2026-102278",
"initial_release_date": "2026-09-28T20:57:09.850000+00:00",
"product_status:fixed": "57",
"product_status:known_affected": "5",
"product_status:known_not_affected": "9",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "brace-expansion: brace-expansion: Denial of Service via uncontrolled recursion in nested brace patterns",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-102278.json",
"version": "3"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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