RHSA-2026:84657

Vulnerability from csaf_redhat - Published: 2026-10-19 04:50 - Updated: 2026-11-05 16:05
Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
Severity
Important
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs: nodejs26: * nodejs26-26.11.1-0.4.hum1 (aarch64, s390x, x86_64) * nodejs26-bin-26.11.1-0.4.hum1 (noarch) * nodejs26-devel-26.11.1-0.4.hum1 (aarch64, s390x, x86_64) * nodejs26-docs-26.11.1-0.4.hum1 (noarch) * nodejs26-full-i18n-26.11.1-0.4.hum1 (aarch64, s390x, x86_64) * nodejs26-libs-26.11.1-0.4.hum1 (aarch64, s390x, x86_64) * nodejs26-npm-11.20.0-1.26.11.1.0.4.hum1 (noarch) * nodejs26-npm-bin-26.11.1-0.4.hum1 (noarch) * v8-14.6-devel-14.6.202.34-1.26.11.1.0.4.hum1 (aarch64, s390x, x86_64) * nodejs26-26.11.1-0.4.hum1.src (src) Security Fix(es): nodejs26: * CVE-2026-87018 * CVE-2026-87029 * CVE-2026-109932 * CVE-2026-109383 * CVE-2026-109869 * CVE-2026-109841 * CVE-2026-109924 * CVE-2026-109829 * CVE-2026-102276
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.
CVE-2026-87018

A flaw was found in undici. A remote server can cause a Denial of Service (DoS) by initiating a Transport Layer Security (TLS) renegotiation and presenting a certificate with a mismatched hostname. Because the client application fails to properly handle the resulting verification error, an uncaught assertion is triggered, terminating the client process and disrupting active network requests.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-617 - Reachable Assertion
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:nodejs26-0:26.11.1-0.4.hum1@aarch64 —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:nodejs26-0:26.11.1-0.4.hum1@s390x —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:nodejs26-0:26.11.1-0.4.hum1@src —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:nodejs26-0:26.11.1-0.4.hum1@x86_64 —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:nodejs26-bin-0:26.11.1-0.4.hum1@noarch@public-hummingbird-aarch64-rpms —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:nodejs26-bin-0:26.11.1-0.4.hum1@noarch@public-hummingbird-s390x-rpms —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:nodejs26-bin-0:26.11.1-0.4.hum1@noarch@public-hummingbird-x86_64-rpms —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:nodejs26-devel-0:26.11.1-0.4.hum1@aarch64 —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:nodejs26-devel-0:26.11.1-0.4.hum1@s390x —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:nodejs26-devel-0:26.11.1-0.4.hum1@x86_64 —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:nodejs26-docs-0:26.11.1-0.4.hum1@noarch@public-hummingbird-aarch64-rpms —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:nodejs26-docs-0:26.11.1-0.4.hum1@noarch@public-hummingbird-s390x-rpms —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:nodejs26-docs-0:26.11.1-0.4.hum1@noarch@public-hummingbird-x86_64-rpms —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:nodejs26-full-i18n-0:26.11.1-0.4.hum1@aarch64 —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:nodejs26-full-i18n-0:26.11.1-0.4.hum1@s390x —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:nodejs26-full-i18n-0:26.11.1-0.4.hum1@x86_64 —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:nodejs26-libs-0:26.11.1-0.4.hum1@aarch64 —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:nodejs26-libs-0:26.11.1-0.4.hum1@s390x —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:nodejs26-libs-0:26.11.1-0.4.hum1@x86_64 —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:nodejs26-npm-0:11.20.0-1.26.11.1.0.4.hum1@noarch@public-hummingbird-aarch64-rpms —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:nodejs26-npm-0:11.20.0-1.26.11.1.0.4.hum1@noarch@public-hummingbird-s390x-rpms —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:nodejs26-npm-0:11.20.0-1.26.11.1.0.4.hum1@noarch@public-hummingbird-x86_64-rpms —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:nodejs26-npm-bin-0:26.11.1-0.4.hum1@noarch@public-hummingbird-aarch64-rpms —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:nodejs26-npm-bin-0:26.11.1-0.4.hum1@noarch@public-hummingbird-s390x-rpms —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:nodejs26-npm-bin-0:26.11.1-0.4.hum1@noarch@public-hummingbird-x86_64-rpms —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:v8-14.6-devel-0:14.6.202.34-1.26.11.1.0.4.hum1@aarch64 —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:v8-14.6-devel-0:14.6.202.34-1.26.11.1.0.4.hum1@s390x —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:v8-14.6-devel-0:14.6.202.34-1.26.11.1.0.4.hum1@x86_64 —
Vendor Fix fix
Threats
Impact Important
CVE-2026-87029

A flaw was found in undici. A remote malicious or compromised HTTP server can cause a Denial of Service (DoS) by sending a small compressed response that decompresses beyond configured size limits. Because undici fails to catch errors triggered by response handlers during decompression, an unhandled exception is produced that crashes the client application.

5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-248 - Uncaught Exception
Affected products
Fixed 28 products, the same list as for CVE-2026-87018
Threats
Impact Moderate
CVE-2026-102276

A flaw was found in brace-expansion. A remote attacker can provide specially crafted brace patterns with excessive nested groups or large arrays to trigger uncontrolled recursion during parsing. This behavior exhausts the native call stack and crashes the application process, leading to a Denial of Service (DoS).

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-770 - Allocation of Resources Without Limits or Throttling
Affected products
Fixed 28 products, the same list as for CVE-2026-87018
Threats
Impact Important
CVE-2026-109383

A flaw was found in undici. This vulnerability may allow a remote attacker to intercept or modify encrypted communications by bypassing custom certificate validation. The issue occurs because the Agent dispatcher discards caller-supplied Transport Layer Security (TLS) verification functions during internal configuration copying, causing the client to silently ignore application-specific checks such as certificate or public-key pinning.

7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE-295 - Improper Certificate Validation
Affected products
Fixed 28 products, the same list as for CVE-2026-87018
Threats
Impact Important
CVE-2026-109829

A flaw was found in undici. When an application configures redirect handling alongside a shared cache, responses received after cross-origin redirects are incorrectly stored under the initial request URL. A remote attacker who controls a redirect destination can exploit this vulnerability to poison the shared cache, serving malicious content to subsequent users requesting trusted URLs. Additionally, this behavior can result in information disclosure if private or user-specific responses are cached and delivered to unauthorized callers.

7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE-346 - Origin Validation Error
Affected products
Fixed 28 products, the same list as for CVE-2026-87018
Threats
Impact Important
CVE-2026-109841

A flaw was found in undici. The HTTP client improperly handles case sensitivity when verifying Subresource Integrity (SRI) algorithm tokens. When an application specifies an uppercase or mixed-case algorithm name, undici treats the token as unrecognized and skips verification instead of enforcing it. A remote attacker who controls the HTTP response body can exploit this flaw to deliver modified content without triggering an integrity error, bypassing intended security protections.

5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE-354 - Improper Validation of Integrity Check Value
Affected products
Fixed 28 products, the same list as for CVE-2026-87018
Threats
Impact Moderate
CVE-2026-109869

A flaw was found in undici. When an application sends a request to a malicious remote server, the server can return a response with excessive content encodings and immediately close the connection. Because the underlying response stream is left unhandled, this abrupt closure triggers an unhandled error that causes the application process to crash. Consequently, an attacker operating a remote server can cause a Denial of Service (DoS), terminating the application even if standard error handling is implemented.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-248 - Uncaught Exception
Affected products
Fixed 28 products, the same list as for CVE-2026-87018
Threats
Impact Important
CVE-2026-109924

A flaw was found in undici. A malicious server can trigger a Denial of Service (DoS) by exhausting application memory. When an application connects to an untrusted Server-Sent Events (SSE) feed, the EventSource parser does not properly limit retained internal state when processing fragmented lines or repeated message fields. This allows an attacker to send crafted or compressed responses that consume excessive memory and terminate the application process.

5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-770 - Allocation of Resources Without Limits or Throttling
Affected products
Fixed 28 products, the same list as for CVE-2026-87018
Threats
Impact Moderate
CVE-2026-109932

A flaw was found in undici. A malicious or compromised WebSocket server can trigger a Denial of Service (DoS) by repeatedly sending small PING messages while refusing to read the client's automated replies. Because the client ignores flow-control signals when writing responses to the network socket, unread messages accumulate indefinitely in memory. This unchecked memory consumption can exhaust available system memory and cause the application process to terminate.

5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-770 - Allocation of Resources Without Limits or Throttling
Affected products
Fixed 28 products, the same list as for CVE-2026-87018
Threats
Impact Moderate
References
URL Category
https://access.redhat.com/errata/RHSA-2026:84657 self
https://access.redhat.com/security/cve/CVE-2026-102276 external
https://access.redhat.com/security/cve/CVE-2026-109383 external
https://access.redhat.com/security/cve/CVE-2026-109829 external
https://access.redhat.com/security/cve/CVE-2026-109841 external
https://access.redhat.com/security/cve/CVE-2026-109869 external
https://access.redhat.com/security/cve/CVE-2026-109924 external
https://access.redhat.com/security/cve/CVE-2026-109932 external
https://access.redhat.com/security/cve/CVE-2026-87018 external
https://access.redhat.com/security/cve/CVE-2026-87029 external
https://access.redhat.com/security/updates/classi… external
https://images.redhat.com/ external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2026-87018 self
https://bugzilla.redhat.com/show_bug.cgi?id=2553677 external
https://www.cve.org/CVERecord?id=CVE-2026-87018 external
https://nvd.nist.gov/vuln/detail/CVE-2026-87018 external
https://cna.openjsf.org/security-advisories.html external
https://github.com/nodejs/undici/security/advisor… external
https://access.redhat.com/security/cve/CVE-2026-87029 self
https://bugzilla.redhat.com/show_bug.cgi?id=2553726 external
https://www.cve.org/CVERecord?id=CVE-2026-87029 external
https://nvd.nist.gov/vuln/detail/CVE-2026-87029 external
https://github.com/nodejs/undici/security/advisor… external
https://access.redhat.com/security/cve/CVE-2026-102276 self
https://bugzilla.redhat.com/show_bug.cgi?id=2542707 external
https://www.cve.org/CVERecord?id=CVE-2026-102276 external
https://nvd.nist.gov/vuln/detail/CVE-2026-102276 external
https://github.com/juliangruber/brace-expansion/c… external
https://github.com/juliangruber/brace-expansion/c… external
https://github.com/juliangruber/brace-expansion/c… external
https://github.com/juliangruber/brace-expansion/c… external
https://github.com/juliangruber/brace-expansion/s… external
https://access.redhat.com/security/cve/CVE-2026-109383 self
https://bugzilla.redhat.com/show_bug.cgi?id=2553678 external
https://www.cve.org/CVERecord?id=CVE-2026-109383 external
https://nvd.nist.gov/vuln/detail/CVE-2026-109383 external
https://github.com/nodejs/undici/commit/f75eac00ac17 external
https://github.com/nodejs/undici/security/advisor… external
https://access.redhat.com/security/cve/CVE-2026-109829 self
https://bugzilla.redhat.com/show_bug.cgi?id=2553679 external
https://www.cve.org/CVERecord?id=CVE-2026-109829 external
https://nvd.nist.gov/vuln/detail/CVE-2026-109829 external
https://github.com/nodejs/undici/commit/26c2bfb3def0 external
https://github.com/nodejs/undici/security/advisor… external
https://access.redhat.com/security/cve/CVE-2026-109841 self
https://bugzilla.redhat.com/show_bug.cgi?id=2553669 external
https://www.cve.org/CVERecord?id=CVE-2026-109841 external
https://nvd.nist.gov/vuln/detail/CVE-2026-109841 external
https://github.com/nodejs/undici/commit/4f7ef6806e53 external
https://github.com/nodejs/undici/security/advisor… external
https://access.redhat.com/security/cve/CVE-2026-109869 self
https://bugzilla.redhat.com/show_bug.cgi?id=2553656 external
https://www.cve.org/CVERecord?id=CVE-2026-109869 external
https://nvd.nist.gov/vuln/detail/CVE-2026-109869 external
https://github.com/nodejs/undici/commit/b5084c7dc239 external
https://github.com/nodejs/undici/security/advisor… external
https://access.redhat.com/security/cve/CVE-2026-109924 self
https://bugzilla.redhat.com/show_bug.cgi?id=2553663 external
https://www.cve.org/CVERecord?id=CVE-2026-109924 external
https://nvd.nist.gov/vuln/detail/CVE-2026-109924 external
https://github.com/nodejs/undici/commit/789ef26461c external
https://github.com/nodejs/undici/security/advisor… external
https://access.redhat.com/security/cve/CVE-2026-109932 self
https://bugzilla.redhat.com/show_bug.cgi?id=2553687 external
https://www.cve.org/CVERecord?id=CVE-2026-109932 external
https://nvd.nist.gov/vuln/detail/CVE-2026-109932 external
https://github.com/nodejs/undici/security/advisor… external
To clipboard 

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          "text": "This vulnerability is evaluated as an Important severity flaw for Red Hat products because an unauthenticated remote server can terminate a client Node.js process, halting all concurrent tasks and in-flight operations. In typical Red Hat deployments, containerized microservices and administrative consoles rely on undici or runtime fetch APIs to communicate with external web endpoints. Exploitation requires the client application to establish an outbound TLS 1.2 connection to a malicious or compromised endpoint that initiates session renegotiation with a non-matching certificate. Workloads communicating strictly with trusted endpoints or utilizing TLS 1.3 connections are inherently protected, as TLS 1.3 does not permit server-driven renegotiation.",
          "title": "Statement"
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          "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"
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        "id": "CWE-248",
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          "title": "Statement"
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          "title": "Vulnerability description"
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          "text": "Red Hat Product Security rates the severity of this vulnerability as Important because an unauthenticated remote attacker can crash running Node.js services by submitting malformed pattern strings, resulting in a denial of service. In Red Hat environments, applications that accept arbitrary glob or expansion patterns from external inputs are susceptible to unexpected termination due to an unhandled call stack overflow. While this flaw allows service interruption without requiring privileges, it does not lead to code execution or compromise data confidentiality and integrity.",
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          "title": "Vulnerability summary"
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          "text": "This vulnerability is rated as having an Important severity for Red Hat products because an attacker positioned on the network could bypass custom cryptographic protections, allowing the interception or tampering of sensitive traffic. Standard system trust stores and default certificate chain validations are not compromised by this flaw, which reduces exposure for environments relying solely on standard public key infrastructure. The elevated risk is restricted to services and applications that configure specialized certificate validation handlers, such as explicit certificate or public key pinning, when establishing outbound connections.",
          "title": "Statement"
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          "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.",
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          "title": "Vulnerability description"
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          "title": "Statement"
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      "cve": "CVE-2026-109841",
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        "id": "CWE-354",
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          "title": "Vulnerability description"
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          "text": "undici: undici: Subresource Integrity bypass via non-lowercase algorithm tokens",
          "title": "Vulnerability summary"
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          "text": "In Red Hat environments, this vulnerability is rated as Moderate impact because successful exploitation requires an adversary capable of tampering with network responses alongside the uncommon prerequisite that an application explicitly configured non-lowercase hashing algorithms for Subresource Integrity checks. Standard deployments typically employ lowercase digest names, which properly enforce validation and prevent bypass. Furthermore, the issue is constrained to compromising response integrity when client workloads rely on undici\u0027s fetch implementation under these specific naming conditions, without directly leading to system compromise or arbitrary code execution.",
          "title": "Statement"
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        "id": "CWE-248",
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          "title": "Vulnerability description"
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          "text": "undici: undici: Denial of Service via unhandled stream error on excessive content encodings",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability is rated as an Important severity because an unauthenticated remote server can trigger an unhandled runtime error that abruptly terminates the parent Node.js process, bypassing application-level catch blocks. In Red Hat products and containerized workloads running affected Node.js runtimes, the flaw impacts services executing outbound HTTP calls to untrusted or external third-party endpoints. Conversely, deployments where applications only interact with verified internal endpoints or do not fetch content from untrusted remote hosts are not exposed to this denial-of-service condition.",
          "title": "Statement"
        },
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          "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"
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        "id": "CWE-770",
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          "title": "Vulnerability description"
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          "text": "undici: undici: Denial of Service via memory exhaustion in EventSource client",
          "title": "Vulnerability summary"
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          "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"
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          "title": "Vulnerability description"
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          "title": "Statement"
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          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-109932"
        },
        {
          "category": "external",
          "summary": "RHBZ#2553687",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2553687"
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          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-109932",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-109932"
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          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-109932",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-109932"
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          "category": "external",
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      "release_date": "2026-10-15T18:44:22.571000+00:00",
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          "category": "vendor_fix",
          "date": "2026-10-19T04:50:55+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/",
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          "restart_required": {
            "category": "none"
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          "url": "https://access.redhat.com/errata/RHSA-2026:84657"
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "undici: undici: Denial of Service via unbounded WebSocket PONG buffering"
    }
  ]
}



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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

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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

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JSON
How durations are calculated

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    Related by attack behaviour

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