CVE-2026-56852 (GCVE-0-2026-56852)
Vulnerability from cvelistv5 – Published: 2026-07-21 19:18 – Updated: 2026-08-10 22:57
VLAI
EPSS
VEX
Title
Infinite loop on invalid input in golang.org/x/text
Summary
A norm.Iter can enter an infinite loop when handling input containing invalid UTF-8 bytes.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-23 13:26 UTC
CWE
- CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Assigner
References
3 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| golang.org/x/text | golang.org/x/text/unicode/norm |
Affected:
0 , < 0.39.0
(semver)
|
guessed |
{
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"userInteraction": "NONE",
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"description": "CWE-835 Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
"lang": "en",
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}
]
}
],
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
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{
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{
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},
{
"name": "Form.Append"
},
{
"name": "Form.AppendString"
},
{
"name": "Form.Bytes"
},
{
"name": "Form.FirstBoundary"
},
{
"name": "Form.FirstBoundaryInString"
},
{
"name": "Form.IsNormal"
},
{
"name": "Form.IsNormalString"
},
{
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},
{
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{
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{
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},
{
"name": "Iter.InitString"
},
{
"name": "Iter.Next"
},
{
"name": "Iter.Seek"
},
{
"name": "normReader.Read"
},
{
"name": "normWriter.Write"
}
],
"vendor": "golang.org/x/text",
"versions": [
{
"lessThan": "0.39.0",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "Viky Choi (\"vikychoi\" on GitHub)"
}
],
"descriptions": [
{
"lang": "en",
"value": "A norm.Iter can enter an infinite loop when handling input containing invalid UTF-8 bytes."
}
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"description": "CWE-835: Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
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{
"url": "https://go.dev/issue/80142"
},
{
"url": "https://go.dev/cl/794100"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-5970"
}
],
"title": "Infinite loop on invalid input in golang.org/x/text"
}
},
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"datePublished": "2026-07-21T19:18:59.951Z",
"dateReserved": "2026-06-23T15:10:49.352Z",
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"state": "PUBLISHED"
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"date": "2026-09-22",
"epss": "0.00475",
"percentile": "0.40219"
},
"microsoft_vex": {
"current_release_date": "2026-09-09T01:56:48.000Z",
"cve": "CVE-2026-56852",
"id": "msrc_CVE-2026-56852",
"initial_release_date": "2026-07-25T01:04:17.000Z",
"product_status:fixed": "40",
"product_status:known_affected": "42",
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"product_status:under_investigation": "2",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "Infinite loop on invalid input in golang.org/x/text",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-56852.json",
"version": "5"
},
"nvd": {
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{
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"defaultStatus": "unaffected",
"packageName": "golang.org/x/text/unicode/norm",
"product": "golang.org/x/text/unicode/norm",
"programRoutines": [
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},
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{
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{
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{
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{
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},
{
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}
],
"vendor": "golang.org/x/text",
"versions": [
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"status": "affected",
"version": "0",
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"lastModified": "2026-07-23T18:27:48.877",
"metrics": {
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"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
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"title": "golang.org/x/text: golang.org/x/text: Denial of Service via invalid UTF-8 input",
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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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