CVE-2026-68523 (GCVE-0-2026-68523)
Vulnerability from cvelistv5 – Published: 2026-09-17 20:23 – Updated: 2026-09-17 20:23
VLAI
EPSS
VEX
Title
Fulgur: Unbounded page slicing from attacker-controlled CSS height causes denial of service
Summary
`fulgur` converts untrusted HTML/CSS into PDF, commonly on a server that processes input supplied by many tenants. In versions prior to 0.19.0, a body-direct child whose CSS-resolved height greatly exceeds the page height was sliced into one fragment per page with no upper bound. This is fixed in 0.19.0. A `MAX_PAGES` cap bounds the slice loop — halting it even
for a `+inf` height — and non-finite layout heights are sanitized so they can no longer drive the loop. As a workaround, validate or constrain untrusted CSS (in particular `height` / `vh` on body-level elements) before passing HTML to fulgur.
Severity
7.5 (High)
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/fulgur-rs/fulgur/security/advi… | x_refsource_CONFIRM |
| https://github.com/fulgur-rs/fulgur/pull/501 | x_refsource_MISC |
| https://rustsec.org/advisories/RUSTSEC-2026-0200.html | x_refsource_MISC |
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"product": "fulgur",
"vendor": "fulgur-rs",
"versions": [
{
"status": "affected",
"version": "\u003c 0.19.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "`fulgur` converts untrusted HTML/CSS into PDF, commonly on a server that processes input supplied by many tenants. In versions prior to 0.19.0, a body-direct child whose CSS-resolved height greatly exceeds the page height was sliced into one fragment per page with no upper bound. This is fixed in 0.19.0. A `MAX_PAGES` cap bounds the slice loop \u2014 halting it even\nfor a `+inf` height \u2014 and non-finite layout heights are sanitized so they can no longer drive the loop. As a workaround, validate or constrain untrusted CSS (in particular `height` / `vh` on body-level elements) before passing HTML to fulgur."
}
],
"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": [
{
"cweId": "CWE-400",
"description": "CWE-400: Uncontrolled Resource Consumption",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-835",
"description": "CWE-835: Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-17T20:23:23.616Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/fulgur-rs/fulgur/security/advisories/GHSA-j5cx-ph8g-95v3",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/fulgur-rs/fulgur/security/advisories/GHSA-j5cx-ph8g-95v3"
},
{
"name": "https://github.com/fulgur-rs/fulgur/pull/501",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/fulgur-rs/fulgur/pull/501"
},
{
"name": "https://rustsec.org/advisories/RUSTSEC-2026-0200.html",
"tags": [
"x_refsource_MISC"
],
"url": "https://rustsec.org/advisories/RUSTSEC-2026-0200.html"
}
],
"source": {
"advisory": "GHSA-j5cx-ph8g-95v3",
"discovery": "UNKNOWN"
},
"title": "Fulgur: Unbounded page slicing from attacker-controlled CSS height causes denial of service"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-68523",
"datePublished": "2026-09-17T20:23:23.616Z",
"dateReserved": "2026-07-30T16:19:08.082Z",
"dateUpdated": "2026-09-17T20:23:23.616Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-68523",
"date": "2026-09-18",
"epss": "0.00339",
"percentile": "0.27421"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"product": "fulgur",
"vendor": "fulgur-rs",
"versions": [
{
"status": "affected",
"version": "\u003c 0.19.0"
}
]
}
],
"source": "security-advisories@github.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "`fulgur` converts untrusted HTML/CSS into PDF, commonly on a server that processes input supplied by many tenants. In versions prior to 0.19.0, a body-direct child whose CSS-resolved height greatly exceeds the page height was sliced into one fragment per page with no upper bound. This is fixed in 0.19.0. A `MAX_PAGES` cap bounds the slice loop \u2014 halting it even\nfor a `+inf` height \u2014 and non-finite layout heights are sanitized so they can no longer drive the loop. As a workaround, validate or constrain untrusted CSS (in particular `height` / `vh` on body-level elements) before passing HTML to fulgur."
}
],
"id": "CVE-2026-68523",
"lastModified": "2026-09-17T21:17:19.127",
"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": "2026-09-17T21:17:19.127",
"references": [
{
"source": "security-advisories@github.com",
"url": "https://github.com/fulgur-rs/fulgur/pull/501"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/fulgur-rs/fulgur/security/advisories/GHSA-j5cx-ph8g-95v3"
},
{
"source": "security-advisories@github.com",
"url": "https://rustsec.org/advisories/RUSTSEC-2026-0200.html"
}
],
"sourceIdentifier": "security-advisories@github.com",
"vulnStatus": "Received",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-400"
},
{
"lang": "en",
"value": "CWE-835"
}
],
"source": "security-advisories@github.com",
"type": "Primary"
}
]
}
}
}
}
Loading…
Loading…
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.
Loading…
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.
Loading…
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.
Loading…