CVE-2026-18924 (GCVE-0-2026-18924)
Vulnerability from cvelistv5 – Published: 2026-09-06 17:47 – Updated: 2026-09-15 06:02
VLAI
EPSS
VEX
Title
HTTP/2 server push UAF
Summary
A flaw in libcurl's handling of HTTP/2 Server Push streams, when the parent
handle is set to share connections with other handles, can lead to
use-after-free in the cleanup process.
Severity
9.1 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 15:40 UTC
CWE
- CWE-416 - Use After Free
Assigner
References
Impacted products
3 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| curl | curl |
Affected:
7.44.0 , < 8.14.2
(semver)
Affected: 8.15.0 , < 8.16.1 (semver) Affected: 8.17.0 , < 8.20.1 (semver) Affected: 8.21.0 , < 8.22.0 (semver) |
guessed | |
| curl | curl |
Affected:
ea7134ac874a66107e54ff93657ac565cf2ec4aa , < 90325ff0444cbdff368bda5d26d6405a0bb6ee43
(git)
|
guessed | |
| curl | curl |
Affected:
8.21.0
Affected: 8.20.0 Affected: 8.19.0 Affected: 8.18.0 Affected: 8.17.0 Affected: 8.16.0 Affected: 8.15.0 Affected: 8.14.1 Affected: 8.14.0 Affected: 8.13.0 Affected: 8.12.1 Affected: 8.12.0 Affected: 8.11.1 Affected: 8.11.0 Affected: 8.10.1 Affected: 8.10.0 Affected: 8.9.1 Affected: 8.9.0 Affected: 8.8.0 Affected: 8.7.1 Affected: 8.7.0 Affected: 8.6.0 Affected: 8.5.0 Affected: 8.4.0 Affected: 8.3.0 Affected: 8.2.1 Affected: 8.2.0 Affected: 8.1.2 Affected: 8.1.1 Affected: 8.1.0 Affected: 8.0.1 Affected: 8.0.0 Affected: 7.88.1 Affected: 7.88.0 Affected: 7.87.0 Affected: 7.86.0 Affected: 7.85.0 Affected: 7.84.0 Affected: 7.83.1 Affected: 7.83.0 Affected: 7.82.0 Affected: 7.81.0 Affected: 7.80.0 Affected: 7.79.1 Affected: 7.79.0 Affected: 7.78.0 Affected: 7.77.0 Affected: 7.76.1 Affected: 7.76.0 Affected: 7.75.0 Affected: 7.74.0 Affected: 7.73.0 Affected: 7.72.0 Affected: 7.71.1 Affected: 7.71.0 Affected: 7.70.0 Affected: 7.69.1 Affected: 7.69.0 Affected: 7.68.0 Affected: 7.67.0 Affected: 7.66.0 Affected: 7.65.3 Affected: 7.65.2 Affected: 7.65.1 Affected: 7.65.0 Affected: 7.64.1 Affected: 7.64.0 Affected: 7.63.0 Affected: 7.62.0 Affected: 7.61.1 Affected: 7.61.0 Affected: 7.60.0 Affected: 7.59.0 Affected: 7.58.0 Affected: 7.57.0 Affected: 7.56.1 Affected: 7.56.0 Affected: 7.55.1 Affected: 7.55.0 Affected: 7.54.1 Affected: 7.54.0 Affected: 7.53.1 Affected: 7.53.0 Affected: 7.52.1 Affected: 7.52.0 Affected: 7.51.0 Affected: 7.50.3 Affected: 7.50.2 Affected: 7.50.1 Affected: 7.50.0 Affected: 7.49.1 Affected: 7.49.0 Affected: 7.48.0 Affected: 7.47.1 Affected: 7.47.0 Affected: 7.46.0 Affected: 7.45.0 Affected: 7.44.0 |
guessed |
{
"containers": {
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{
"metrics": [
{
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"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.1,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
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}
},
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"options": [
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{
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{
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"role": "CISA Coordinator",
"timestamp": "2026-09-08T15:40:47.638991Z",
"version": "2.0.3"
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"type": "ssvc"
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}
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"url": "https://hackerone.com/reports/3916059"
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"title": "CISA ADP Vulnrichment"
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"status": "affected",
"version": "8.8.0"
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{
"status": "affected",
"version": "8.7.1"
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"version": "8.7.0"
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"version": "8.5.0"
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"version": "8.2.1"
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"version": "7.88.1"
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"version": "7.83.1"
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"version": "7.83.0"
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"version": "7.81.0"
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"version": "7.80.0"
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"version": "7.79.1"
},
{
"status": "affected",
"version": "7.79.0"
},
{
"status": "affected",
"version": "7.78.0"
},
{
"status": "affected",
"version": "7.77.0"
},
{
"status": "affected",
"version": "7.76.1"
},
{
"status": "affected",
"version": "7.76.0"
},
{
"status": "affected",
"version": "7.75.0"
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{
"status": "affected",
"version": "7.74.0"
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"version": "7.73.0"
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"version": "7.72.0"
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"version": "7.65.3"
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"version": "7.65.1"
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"version": "7.65.0"
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"version": "7.64.1"
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"version": "7.64.0"
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"version": "7.63.0"
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"version": "7.62.0"
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{
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"value": "Daniel Stenberg"
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}
],
"problemTypes": [
{
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{
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"description": "Use After Free",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-15T06:02:47.329Z",
"orgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
"shortName": "curl"
},
"references": [
{
"url": "https://curl.se/docs/CVE-2026-18924.json"
},
{
"url": "https://curl.se/docs/CVE-2026-18924.html"
},
{
"url": "https://hackerone.com/reports/3916059"
}
],
"title": "HTTP/2 server push UAF",
"x_generator": {
"engine": "cvelib 1.8.0"
},
"x_osv": {
"affected": [
{
"ranges": [
{
"events": [
{
"introduced": "7.44.0"
},
{
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},
{
"introduced": "8.15.0"
},
{
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{
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{
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{
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{
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{
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}
],
"repo": "https://github.com/curl/curl.git",
"type": "GIT"
}
],
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]
}
],
"aliases": [
"CVE-2026-18924"
],
"credits": [
{
"name": "Stephan Zeisberg (Security Research Labs)",
"type": "finder"
},
{
"name": "Daniel Stenberg",
"type": "remediation developer"
}
],
"database_specific": {
"CWE": {
"desc": "Use After Free",
"id": "CWE-416"
},
"URL": "https://curl.se/docs/CVE-2026-18924.json",
"affects": "lib",
"issue": "https://hackerone.com/reports/3916059",
"last_affected": "8.21.0",
"package": "curl",
"severity": "Low",
"www": "https://curl.se/docs/CVE-2026-18924.html"
},
"details": "A flaw in libcurl\u0027s handling of HTTP/2 Server Push streams, when the parent\nhandle is set to share connections with other handles, can lead to\nuse-after-free in the cleanup process.",
"id": "CURL-CVE-2026-18924",
"modified": "2026-09-07T10:34:51.00Z",
"published": "2026-09-02T08:00:00.00Z",
"schema_version": "1.5.0",
"summary": "HTTP/2 server push UAF"
}
}
},
"cveMetadata": {
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"assignerShortName": "curl",
"cveId": "CVE-2026-18924",
"datePublished": "2026-09-06T17:47:27.820Z",
"dateReserved": "2026-08-05T08:31:56.125Z",
"dateUpdated": "2026-09-15T06:02:47.329Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-18924",
"date": "2026-09-22",
"epss": "0.00897",
"percentile": "0.58063"
},
"microsoft_vex": {
"current_release_date": "2026-09-09T15:06:15.000Z",
"cve": "CVE-2026-18924",
"id": "msrc_CVE-2026-18924",
"initial_release_date": "2026-09-08T01:03:36.000Z",
"product_status:known_affected": "1",
"product_status:known_not_affected": "8",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "HTTP/2 server push UAF",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-18924.json",
"version": "3"
},
"nvd": {
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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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},
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},
{
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},
{
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},
{
"status": "affected",
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},
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"status": "affected",
"version": "8.16.0"
},
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"status": "affected",
"version": "8.15.0"
},
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"status": "affected",
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},
{
"status": "affected",
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},
{
"status": "affected",
"version": "8.13.0"
},
{
"status": "affected",
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},
{
"status": "affected",
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},
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"status": "affected",
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},
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},
{
"status": "affected",
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},
{
"status": "affected",
"version": "8.10.0"
},
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"8.11.1",
"8.11.0",
"8.10.1",
"8.10.0",
"8.9.1",
"8.9.0",
"8.8.0",
"8.7.1",
"8.7.0",
"8.6.0",
"8.5.0",
"8.4.0",
"8.3.0",
"8.2.1",
"8.2.0",
"8.1.2",
"8.1.1",
"8.1.0",
"8.0.1",
"8.0.0",
"7.88.1",
"7.88.0",
"7.87.0",
"7.86.0",
"7.85.0",
"7.84.0",
"7.83.1",
"7.83.0",
"7.82.0",
"7.81.0",
"7.80.0",
"7.79.1",
"7.79.0",
"7.78.0",
"7.77.0",
"7.76.1",
"7.76.0",
"7.75.0",
"7.74.0",
"7.73.0",
"7.72.0",
"7.71.1",
"7.71.0",
"7.70.0",
"7.69.1",
"7.69.0",
"7.68.0",
"7.67.0",
"7.66.0",
"7.65.3",
"7.65.2",
"7.65.1",
"7.65.0",
"7.64.1",
"7.64.0",
"7.63.0",
"7.62.0",
"7.61.1",
"7.61.0",
"7.60.0",
"7.59.0",
"7.58.0",
"7.57.0",
"7.56.1",
"7.56.0",
"7.55.1",
"7.55.0",
"7.54.1",
"7.54.0",
"7.53.1",
"7.53.0",
"7.52.1",
"7.52.0",
"7.51.0",
"7.50.3",
"7.50.2",
"7.50.1",
"7.50.0",
"7.49.1",
"7.49.0",
"7.48.0",
"7.47.1",
"7.47.0",
"7.46.0",
"7.45.0",
"7.44.0"
]
}
],
"aliases": [
"CVE-2026-18924"
],
"credits": [
{
"name": "Stephan Zeisberg (Security Research Labs)",
"type": "finder"
},
{
"name": "Daniel Stenberg",
"type": "remediation developer"
}
],
"database_specific": {
"CWE": {
"desc": "Use After Free",
"id": "CWE-416"
},
"URL": "https://curl.se/docs/CVE-2026-18924.json",
"affects": "lib",
"issue": "https://hackerone.com/reports/3916059",
"last_affected": "8.21.0",
"package": "curl",
"severity": "Low",
"www": "https://curl.se/docs/CVE-2026-18924.html"
},
"details": "A flaw in libcurl\u0027s handling of HTTP/2 Server Push streams, when the parent\nhandle is set to share connections with other handles, can lead to\nuse-after-free in the cleanup process.",
"id": "CURL-CVE-2026-18924",
"modified": "2026-09-07T10:34:51.00Z",
"published": "2026-09-02T08:00:00.00Z",
"schema_version": "1.5.0",
"summary": "HTTP/2 server push UAF"
}
}
},
"cveMetadata": {
"assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
"assignerShortName": "curl",
"cveId": "CVE-2026-18924",
"datePublished": "2026-09-06T17:47:27.820Z",
"dateReserved": "2026-08-05T08:31:56.125Z",
"dateUpdated": "2026-09-15T06:02:47.329Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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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