CVE-2026-32280 (GCVE-0-2026-32280)
Vulnerability from cvelistv5
Published
2026-04-08 01:06
Modified
2026-04-08 17:46
Severity ?
VLAI Severity ?
EPSS score ?
Summary
During chain building, the amount of work that is done is not correctly limited when a large number of intermediate certificates are passed in VerifyOptions.Intermediates, which can lead to a denial of service. This affects both direct users of crypto/x509 and users of crypto/tls.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Go standard library | crypto/x509 |
Version: 0 ≤ Version: 1.26.0-0 ≤ |
{
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"metrics": [
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"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"
}
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"id": "CVE-2026-32280",
"options": [
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{
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"role": "CISA Coordinator",
"timestamp": "2026-04-08T17:46:14.569488Z",
"version": "2.0.3"
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"description": "CWE-770 Allocation of Resources Without Limits or Throttling",
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"providerMetadata": {
"dateUpdated": "2026-04-08T17:46:47.347Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
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"title": "CISA ADP Vulnrichment"
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],
"cna": {
"affected": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "crypto/x509",
"product": "crypto/x509",
"programRoutines": [
{
"name": "Certificate.buildChains"
},
{
"name": "Certificate.Verify"
}
],
"vendor": "Go standard library",
"versions": [
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"lessThan": "1.25.9",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "1.26.2",
"status": "affected",
"version": "1.26.0-0",
"versionType": "semver"
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"credits": [
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"lang": "en",
"value": "Jakub Ciolek - https://ciolek.dev"
}
],
"descriptions": [
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"value": "During chain building, the amount of work that is done is not correctly limited when a large number of intermediate certificates are passed in VerifyOptions.Intermediates, which can lead to a denial of service. This affects both direct users of crypto/x509 and users of crypto/tls."
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"dateUpdated": "2026-04-08T01:06:58.595Z",
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"shortName": "Go"
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"references": [
{
"url": "https://go.dev/cl/758320"
},
{
"url": "https://go.dev/issue/78282"
},
{
"url": "https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-4947"
}
],
"title": "Unexpected work during chain building in crypto/x509"
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"datePublished": "2026-04-08T01:06:58.595Z",
"dateReserved": "2026-03-11T16:38:46.555Z",
"dateUpdated": "2026-04-08T17:46:47.347Z",
"state": "PUBLISHED"
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"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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