RHSA-2026:82895
Vulnerability from csaf_redhat - Published: 2026-10-14 11:39 - Updated: 2026-10-15 19:17Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Important
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
curl:
* curl-8.23.0-0.1.hum1 (aarch64, s390x, x86_64)
* libcurl-8.23.0-0.1.hum1 (aarch64, s390x, x86_64)
* libcurl-devel-8.23.0-0.1.hum1 (aarch64, s390x, x86_64)
* libcurl-minimal-8.23.0-0.1.hum1 (aarch64, s390x, x86_64)
* curl-8.23.0-0.1.hum1.src (src)
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
An out of bounds read flaw has been discovered in the curl project. Under specific conditions the path comparison logic makes curl read outside a heap buffer boundary. This bug either causes a crash or it potentially makes the comparison come to the wrong conclusion and lets the clear-text site override the contents of the secure cookie, contrary to expectations and depending on the memory contents immediately following the single-byte allocation that holds the path.
5.3 (Medium)
Affected products
Fixed
13 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:curl-0:8.23.0-0.1.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:curl-0:8.23.0-0.1.hum1@s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:curl-0:8.23.0-0.1.hum1@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:curl-0:8.23.0-0.1.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:libcurl-0:8.23.0-0.1.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:libcurl-0:8.23.0-0.1.hum1@s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:libcurl-0:8.23.0-0.1.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:libcurl-devel-0:8.23.0-0.1.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:libcurl-devel-0:8.23.0-0.1.hum1@s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:libcurl-devel-0:8.23.0-0.1.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:libcurl-minimal-0:8.23.0-0.1.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:libcurl-minimal-0:8.23.0-0.1.hum1@s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:libcurl-minimal-0:8.23.0-0.1.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
A flaw was found in curl. When performing multi-threaded LDAPS (Lightweight Directory Access Protocol Secure) transfers, changes to Transport Layer Security (TLS) options in one thread could inadvertently apply globally, affecting other concurrent transfers. This could lead to unintended security posture changes, such as disabling certificate verification for other threads. This vulnerability can result in a security bypass, where expected security checks are not performed.
4.8 (Medium)
Affected products
Fixed
13 products, the same list as for
CVE-2025-9086
Threats
Impact
Moderate
A flaw was found in libcurl. When handling secure connections (TLS) and reusing connection settings, libcurl could incorrectly apply a cached security setting related to certificate chain validation. This could allow libcurl to accept a server's security certificate that it should have otherwise rejected, potentially compromising the integrity of the secure connection.
6.8 (Medium)
Affected products
Fixed
13 products, the same list as for
CVE-2025-9086
Threats
Impact
Low
A flaw was found in the curl command-line tool. When configured to follow redirects to Secure File Transfer Protocol (SFTP) or Secure Copy Protocol (SCP) destinations, curl fails to apply user-specified Secure Shell (SSH) host verification settings. A malicious server can exploit this flaw by redirecting requests to an untrusted server, causing the connection to proceed without validating the remote host's identity. This failure can enable an attacker to intercept communications, leading to sensitive information disclosure.
6.8 (Medium)
Affected products
Fixed
13 products, the same list as for
CVE-2025-9086
Threats
Impact
Low
A flaw was found in curl. A malicious or compromised HTTP proxy server can trick curl into sending authentication credentials intended for the target destination server directly to the proxy itself. When establishing a connection tunnel, if the proxy replies with an HTTP 401 Unauthorized status code instead of a proxy authentication challenge, curl mishandles the response and transmits the origin server's credentials. This issue leads to information disclosure, allowing an untrusted proxy to intercept sensitive passwords and authentication tokens.
6.5 (Medium)
Affected products
Fixed
13 products, the same list as for
CVE-2025-9086
Threats
Impact
Low
A flaw was found in curl. A remote malicious server can cause a Denial of Service (DoS) or memory corruption in applications that enable File Transfer Protocol (FTP) wildcard matching. When a wildcard listing operation fails, curl does not properly reset its internal callback handlers before the connection handle is reused or duplicated. An application that subsequently reuses or clones this corrupted handle may experience an immediate application crash or unsafe memory access.
6.5 (Medium)
Affected products
Fixed
13 products, the same list as for
CVE-2025-9086
Threats
Impact
Moderate
A flaw was found in curl. When curl uploads data over an HTTP/2 connection, it mishandles server stream reset frames, which can lead to the reuse of previously released memory. Under specific memory and timing conditions, a malicious server can exploit this flaw to execute arbitrary code on the client system or cause the application to crash, resulting in a Denial of Service (DoS).
8.1 (High)
Affected products
Fixed
13 products, the same list as for
CVE-2025-9086
Threats
Impact
Important
References
46 references
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]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "curl: curl: FTP wildcard write callback mixup"
},
{
"acknowledgments": [
{
"names": [
"Luna with Claude"
],
"organization": "Anthropic"
}
],
"cve": "CVE-2026-92392",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2026-10-09T15:04:00.630000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2548642"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in curl. When curl uploads data over an HTTP/2 connection, it mishandles server stream reset frames, which can lead to the reuse of previously released memory. Under specific memory and timing conditions, a malicious server can exploit this flaw to execute arbitrary code on the client system or cause the application to crash, resulting in a Denial of Service (DoS).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "curl: curl: HTTP/2 upload Use-After-Free",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat has rated this flaw as having an Important severity because a malicious HTTP/2 server can remotely trigger memory corruption during data uploads, potentially leading to client application crashes or arbitrary code execution. While remote code execution has been demonstrated, exploitation requires strict prerequisites such as exact heap layout predictability and precise server-controlled timing, which limits broad automated exploitability. Earlier versions of Red Hat Enterprise Linux, including RHEL 8 and 9, are not vulnerable as they ship curl builds preceding the introduction of the flawed logic.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
"fixed": [
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]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-92392"
},
{
"category": "external",
"summary": "RHBZ#2548642",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2548642"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-92392",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-92392"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-92392",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-92392"
}
],
"release_date": "2026-10-14T12:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-14T11:39:33+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
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],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:82895"
},
{
"category": "workaround",
"details": "Disable HTTP/2 in curl. For the curl CLI, use the `--http1.1` flag. For applications using libcurl, set `CURLOPT_HTTP_VERSION` to `CURL_HTTP_VERSION_1_1`. This vulnerability is only exploitable over HTTP/2 connections; HTTP/1.1 connections are not affected. Note that applications which depend on HTTP/2-specific features, such as gRPC, will not function with this workaround.",
"product_ids": [
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]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"products": [
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "curl: curl: HTTP/2 upload Use-After-Free"
}
]
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.