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vuln-cve/data/2026/34xxx/CVE-2026-34520.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-34520",
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"state": "PUBLISHED",
"assignerShortName": "GitHub_M",
"dateReserved": "2026-03-30T16:03:31.047Z",
"datePublished": "2026-04-01T20:27:48.350Z",
"dateUpdated": "2026-04-04T03:13:48.418Z"
},
"containers": {
"cna": {
"title": "AIOHTTP: C parser (llhttp) accepts null bytes and control characters in response header values - header injection / security bypass",
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-113",
"lang": "en",
"description": "CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')",
"type": "CWE"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "LOW",
"vulnAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"subAvailabilityImpact": "NONE",
"baseScore": 2.7,
"baseSeverity": "LOW",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U",
"version": "4.0"
}
}
],
"references": [
{
"name": "https://github.com/aio-libs/aiohttp/security/advisories/GHSA-63hf-3vf5-4wqf",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/aio-libs/aiohttp/security/advisories/GHSA-63hf-3vf5-4wqf"
},
{
"name": "https://github.com/aio-libs/aiohttp/commit/9370b9714a7a56003cacd31a9b4ae16eab109ba4",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/aio-libs/aiohttp/commit/9370b9714a7a56003cacd31a9b4ae16eab109ba4"
},
{
"name": "https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4"
}
],
"affected": [
{
"vendor": "aio-libs",
"product": "aiohttp",
"versions": [
{
"version": "< 3.13.4",
"status": "affected"
}
]
}
],
"providerMetadata": {
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M",
"dateUpdated": "2026-04-01T20:27:48.350Z"
},
"descriptions": [
{
"lang": "en",
"value": "AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, the C parser (the default for most installs) accepted null bytes and control characters in response headers. This issue has been patched in version 3.13.4."
}
],
"source": {
"advisory": "GHSA-63hf-3vf5-4wqf",
"discovery": "UNKNOWN"
}
},
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 9.1,
"attackVector": "NETWORK",
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
"confidentialityImpact": "NONE"
}
},
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-04-04T03:13:19.553235Z",
"id": "CVE-2026-34520",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-04-04T03:13:48.418Z"
}
}
]
}
}