RHSA-2026:2768
Vulnerability from csaf_redhat - Published: 2026-02-17 01:05 - Updated: 2026-03-30 23:21A flaw in Node.js’s Permissions model allows attackers to bypass `--allow-fs-read` and `--allow-fs-write` restrictions using crafted relative symlink paths. By chaining directories and symlinks, a script granted access only to the current directory can escape the allowed path and read sensitive files. This breaks the expected isolation guarantees and enables arbitrary file read/write.
A memory exposure flaw has been discovered in Node.js. A flaw in Node.js's buffer allocation logic can expose uninitialized memory when allocations are interrupted, when using the `vm` module with the timeout option. Under specific timing conditions, buffers allocated with `Buffer.alloc` and other `TypedArray` instances like `Uint8Array` may contain leftover data from previous operations, allowing in-process secrets like tokens or passwords to leak or causing data corruption.
A denial of service flaw has been discovered in NodeJS. A malformed `HTTP/2 HEADERS` frame with oversized, invalid `HPACK` data can cause Node.js to crash by triggering an unhandled `TLSSocket` error `ECONNRESET`. Instead of safely closing the connection, the process crashes, enabling a remote denial of service. This primarily affects applications that do not attach explicit error handlers to secure sockets
A stack overflow flaw has been discovered in Node.js error handling where "Maximum call stack size exceeded" errors become uncatchable when `async_hooks.createHook()` is enabled. Instead of reaching `process.on('uncaughtException')`, the process terminates, making the crash unrecoverable. Applications that rely on `AsyncLocalStorage` (v22, v20) or `async_hooks.createHook()` (v24, v22, v20) become vulnerable to denial-of-service crashes triggered by deep recursion under specific conditions.
A flaw in Node.js TLS error handling allows remote attackers to crash or exhaust resources of a TLS server when `pskCallback` or `ALPNCallback` are in use. Synchronous exceptions thrown during these callbacks bypass standard TLS error handling paths (tlsClientError and error), causing either immediate process termination or silent file descriptor leaks that eventually lead to denial of service. Because these callbacks process attacker-controlled input during the TLS handshake, a remote client can repeatedly trigger the issue. This vulnerability affects TLS servers using PSK or ALPN callbacks across Node.js versions where these callbacks throw without being safely wrapped.
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"text": "nodejs: Nodejs file permissions bypass",
"title": "Vulnerability summary"
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"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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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
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"title": "nodejs: Nodejs file permissions bypass"
},
{
"cve": "CVE-2025-55131",
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"id": "CWE-497",
"name": "Exposure of Sensitive System Information to an Unauthorized Control Sphere"
},
"discovery_date": "2026-01-20T21:02:45.759578+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2431350"
}
],
"notes": [
{
"category": "description",
"text": "A memory exposure flaw has been discovered in Node.js. A flaw in Node.js\u0027s buffer allocation logic can expose uninitialized memory when allocations are interrupted, when using the `vm` module with the timeout option. Under specific timing conditions, buffers allocated with `Buffer.alloc` and other `TypedArray` instances like `Uint8Array` may contain leftover data from previous operations, allowing in-process secrets like tokens or passwords to leak or causing data corruption.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "nodejs: Nodejs uninitialized memory exposure",
"title": "Vulnerability summary"
},
{
"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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},
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"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2025-55131"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-55131",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-55131"
},
{
"category": "external",
"summary": "https://nodejs.org/en/blog/vulnerability/december-2025-security-releases",
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
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{
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"id": "CWE-248",
"name": "Uncaught Exception"
},
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"ids": [
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"text": "2431349"
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{
"category": "description",
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"title": "Vulnerability description"
},
{
"category": "summary",
"text": "nodejs: Nodejs denial of service",
"title": "Vulnerability summary"
},
{
"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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"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2025-59465"
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{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-59465",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-59465"
},
{
"category": "external",
"summary": "https://nodejs.org/en/blog/vulnerability/december-2025-security-releases",
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{
"cvss_v3": {
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"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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{
"category": "impact",
"details": "Important"
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"title": "nodejs: Nodejs denial of service"
},
{
"cve": "CVE-2025-59466",
"cwe": {
"id": "CWE-770",
"name": "Allocation of Resources Without Limits or Throttling"
},
"discovery_date": "2026-01-20T21:01:46.025710+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2431343"
}
],
"notes": [
{
"category": "description",
"text": "A stack overflow flaw has been discovered in Node.js error handling where \"Maximum call stack size exceeded\" errors become uncatchable when `async_hooks.createHook()` is enabled. Instead of reaching `process.on(\u0027uncaughtException\u0027)`, the process terminates, making the crash unrecoverable. Applications that rely on `AsyncLocalStorage` (v22, v20) or `async_hooks.createHook()` (v24, v22, v20) become vulnerable to denial-of-service crashes triggered by deep recursion under specific conditions.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "nodejs: Nodejs denial of service",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This flaw requires that the experimental Async hook feature is enabled for use in NodeJS. This feature is not enabled by default on Red Hat systems.",
"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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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-59466"
},
{
"category": "external",
"summary": "RHBZ#2431343",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2431343"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-59466",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-59466"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-59466",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-59466"
},
{
"category": "external",
"summary": "https://nodejs.org/en/blog/vulnerability/december-2025-security-releases",
"url": "https://nodejs.org/en/blog/vulnerability/december-2025-security-releases"
}
],
"release_date": "2026-01-20T20:41:55.628000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-02-17T01:05:30+00:00",
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"privilegesRequired": "NONE",
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"text": "nodejs: Nodejs denial of service",
"title": "Vulnerability summary"
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{
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"text": "Systems configured according to Red Hat guidelines should have their services set to restart in the event of a process crash. This Host system service management mitigates the availability impact to Red Hat customers.",
"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.",
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{
"category": "external",
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{
"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-21637"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-21637",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21637"
},
{
"category": "external",
"summary": "https://nodejs.org/en/blog/vulnerability/december-2025-security-releases",
"url": "https://nodejs.org/en/blog/vulnerability/december-2025-security-releases"
}
],
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{
"category": "vendor_fix",
"date": "2026-02-17T01:05:30+00:00",
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:2768"
},
{
"category": "workaround",
"details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.",
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{
"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": [
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"details": "Moderate"
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],
"title": "nodejs: Nodejs denial of service"
}
]
}
Sightings
| Author | Source | Type | Date |
|---|
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.