RHSA-2026:40380
Vulnerability from csaf_redhat - Published: 2026-07-15 21:40 - Updated: 2026-07-16 03:44Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
Severity
Moderate
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
ruby3.3:
* ruby3.3-3.3.10-23.4.hum1 (aarch64, x86_64)
* ruby3.3-bundled-gems-3.3.10-23.4.hum1 (aarch64, x86_64)
* ruby3.3-default-gems-3.3.10-23.4.hum1 (noarch)
* ruby3.3-devel-3.3.10-23.4.hum1 (aarch64, x86_64)
* ruby3.3-doc-3.3.10-23.4.hum1 (noarch)
* ruby3.3-libs-3.3.10-23.4.hum1 (aarch64, x86_64)
* rubygem3.3-bigdecimal-3.1.5-23.4.hum1 (aarch64, x86_64)
* rubygem3.3-bundler-2.5.22-23.4.hum1 (noarch)
* rubygem3.3-devel-3.5.22-23.4.hum1 (noarch)
* rubygem3.3-io-console-0.7.1-23.4.hum1 (aarch64, x86_64)
* rubygem3.3-irb-1.13.1-23.4.hum1 (noarch)
* rubygem3.3-json-2.7.2-23.4.hum1 (aarch64, x86_64)
* rubygem3.3-minitest-5.20.0-23.4.hum1 (noarch)
* rubygem3.3-power_assert-2.0.3-23.4.hum1 (noarch)
* rubygem3.3-psych-5.1.2-23.4.hum1 (aarch64, x86_64)
* rubygem3.3-racc-1.7.3-23.4.hum1 (aarch64, x86_64)
* rubygem3.3-rake-13.1.0-23.4.hum1 (noarch)
* rubygem3.3-rbs-3.4.0-23.4.hum1 (aarch64, x86_64)
* rubygem3.3-rdoc-6.6.3.1-23.4.hum1 (noarch)
* rubygem3.3-rexml-3.4.4-23.4.hum1 (noarch)
* rubygem3.3-rss-0.3.1-23.4.hum1 (noarch)
* rubygem3.3-rubygems-3.5.22-23.4.hum1 (noarch)
* rubygem3.3-test-unit-3.6.1-23.4.hum1 (noarch)
* rubygem3.3-typeprof-0.21.9-23.4.hum1 (noarch)
* ruby3.3-3.3.10-23.4.hum1.src (src)
Security Fix(es):
ruby3.3:
* CVE-2026-47240
* CVE-2026-47241
* CVE-2026-47242
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.
A flaw was found in Net::IMAP (before 0.4.24, 0.5.14, and 0.6.4). Several commands accept raw string arguments sent to the server without validation or escaping; if derived from user-controlled input, CRLF sequences allow injection of arbitrary IMAP commands.
6.1 (Medium)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:ruby3-3-main@aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Hardened Images:ruby3-3-main@noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Hardened Images:ruby3-3-main@src | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Hardened Images:ruby3-3-main@x86_64 | — |
Vendor Fix
fix
|
Threats
Impact
Moderate
A flaw was found in Net::IMAP, a Ruby library that provides Internet Message Access Protocol (IMAP) client functionality. This vulnerability allows a remote attacker to inject arbitrary IMAP commands. This is possible when an IMAP server does not support non-synchronizing literals, leading to the misinterpretation of data as new commands. This command injection could enable unauthorized actions on the IMAP server.
6.1 (Medium)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:ruby3-3-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:ruby3-3-main@noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:ruby3-3-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:ruby3-3-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
A flaw was found in Net::IMAP, a Ruby client library for the Internet Message Access Protocol (IMAP). This vulnerability allows a remote attacker to cause a denial of service by sending specially crafted input to certain Net::IMAP commands. When a raw string argument, derived from user-controlled input, is not properly validated, it can force subsequent commands to be absorbed, leading to a hung connection and preventing further processing until the connection is closed.
5.9 (Medium)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:ruby3-3-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:ruby3-3-main@noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:ruby3-3-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:ruby3-3-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
References
26 references
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"vulnerabilities": [
{
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"cwe": {
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"name": "Improper Neutralization of CRLF Sequences (\u0027CRLF Injection\u0027)"
},
"discovery_date": "2026-05-09T20:00:49.315366+00:00",
"ids": [
{
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"text": "2468494"
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],
"notes": [
{
"category": "description",
"text": "A flaw was found in Net::IMAP (before 0.4.24, 0.5.14, and 0.6.4). Several commands accept raw string arguments sent to the server without validation or escaping; if derived from user-controlled input, CRLF sequences allow injection of arbitrary IMAP commands.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "net-imap: Net::IMAP: Arbitrary IMAP command injection via CRLF sequences in unvalidated input",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Net::IMAP is vulnerable to IMAP command injection in versions before 0.4.24, 0.5.14, and 0.6.4. Several client commands accept raw string arguments that are sent to the IMAP server without CRLF validation or escaping; if application code passes user-controlled data into those arguments, an attacker can inject additional IMAP commands by embedding carriage return and line feed sequences. Red Hat impact is concentrated in Ruby-based products that bundle a vulnerable net-imap gem, including RHEL Ruby module streams, OpenShift Serverless (hummingbird) Ruby runtimes, and 3scale AMP components (zync/system) that use Net::IMAP with externally influenced input; Perl IMAP client packages on Fedora are a separate codebase and are not affected.",
"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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"Red Hat Hardened Images:ruby3-3-main@noarch",
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"Red Hat Hardened Images:ruby3-3-main@x86_64"
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"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-42257"
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"summary": "RHBZ#2468494",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468494"
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{
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-42257"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42257",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42257"
},
{
"category": "external",
"summary": "https://github.com/ruby/net-imap/releases/tag/v0.4.24",
"url": "https://github.com/ruby/net-imap/releases/tag/v0.4.24"
},
{
"category": "external",
"summary": "https://github.com/ruby/net-imap/releases/tag/v0.5.14",
"url": "https://github.com/ruby/net-imap/releases/tag/v0.5.14"
},
{
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"url": "https://github.com/ruby/net-imap/releases/tag/v0.6.4"
},
{
"category": "external",
"summary": "https://github.com/ruby/net-imap/security/advisories/GHSA-hm49-wcqc-g2xg",
"url": "https://github.com/ruby/net-imap/security/advisories/GHSA-hm49-wcqc-g2xg"
}
],
"release_date": "2026-05-09T19:39:48.398000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-15T21:40:28+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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"Red Hat Hardened Images:ruby3-3-main@noarch",
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"Red Hat Hardened Images:ruby3-3-main@x86_64"
],
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"category": "none"
},
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}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "LOW",
"baseScore": 6.1,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L",
"version": "3.1"
},
"products": [
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"Red Hat Hardened Images:ruby3-3-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "net-imap: Net::IMAP: Arbitrary IMAP command injection via CRLF sequences in unvalidated input"
},
{
"cve": "CVE-2026-47240",
"cwe": {
"id": "CWE-93",
"name": "Improper Neutralization of CRLF Sequences (\u0027CRLF Injection\u0027)"
},
"discovery_date": "2026-06-22T21:01:00.124981+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2491519"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Net::IMAP, a Ruby library that provides Internet Message Access Protocol (IMAP) client functionality. This vulnerability allows a remote attacker to inject arbitrary IMAP commands. This is possible when an IMAP server does not support non-synchronizing literals, leading to the misinterpretation of data as new commands. This command injection could enable unauthorized actions on the IMAP server.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "net-imap: Net::IMAP: Command injection via non-synchronizing literals",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Moderate flaw in the Net::IMAP Ruby library allows for command injection against IMAP servers that lack support for non-synchronizing literals. An attacker could exploit this by providing specially crafted input, leading to the execution of arbitrary IMAP commands and potential unauthorized actions. This risk is primarily present in deployments interacting with older or non-standard IMAP server configurations.",
"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": {
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"Red Hat Hardened Images:ruby3-3-main@aarch64",
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{
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-47240"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-47240",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-47240"
},
{
"category": "external",
"summary": "https://github.com/ruby/net-imap/security/advisories/GHSA-8p34-64r3-mwg8",
"url": "https://github.com/ruby/net-imap/security/advisories/GHSA-8p34-64r3-mwg8"
}
],
"release_date": "2026-06-22T20:17:15.376000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-15T21:40:28+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": [
"Red Hat Hardened Images:ruby3-3-main@aarch64",
"Red Hat Hardened Images:ruby3-3-main@noarch",
"Red Hat Hardened Images:ruby3-3-main@src",
"Red Hat Hardened Images:ruby3-3-main@x86_64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:40380"
},
{
"category": "workaround",
"details": "Explicitly validate user-controlled inputs to prevent embedded non-synchronizing literals unless the server supports them. For a simpler, more cautious approach: all embedded literals can be unconditionally prohibited, by checking that string inputs do not contain any CR or LF bytes.",
"product_ids": [
"Red Hat Hardened Images:ruby3-3-main@aarch64",
"Red Hat Hardened Images:ruby3-3-main@noarch",
"Red Hat Hardened Images:ruby3-3-main@src",
"Red Hat Hardened Images:ruby3-3-main@x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "LOW",
"baseScore": 6.1,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:ruby3-3-main@aarch64",
"Red Hat Hardened Images:ruby3-3-main@noarch",
"Red Hat Hardened Images:ruby3-3-main@src",
"Red Hat Hardened Images:ruby3-3-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "net-imap: Net::IMAP: Command injection via non-synchronizing literals"
},
{
"cve": "CVE-2026-47241",
"cwe": {
"id": "CWE-88",
"name": "Improper Neutralization of Argument Delimiters in a Command (\u0027Argument Injection\u0027)"
},
"discovery_date": "2026-06-22T21:01:13.810999+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2491523"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Net::IMAP, a Ruby client library for the Internet Message Access Protocol (IMAP). This vulnerability allows a remote attacker to cause a denial of service by sending specially crafted input to certain Net::IMAP commands. When a raw string argument, derived from user-controlled input, is not properly validated, it can force subsequent commands to be absorbed, leading to a hung connection and preventing further processing until the connection is closed.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "net-imap: rubygem-net-imap: Net::IMAP: Denial of Service via malformed command input",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A Moderate denial of service flaw was found in the Net::IMAP Ruby client library. This issue occurs when a remote attacker sends specially crafted input to certain Net::IMAP commands, causing the client connection to hang indefinitely. This can prevent further processing of IMAP commands until the connection is manually closed, impacting the availability of services relying on the Net::IMAP client.",
"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": [
"Red Hat Hardened Images:ruby3-3-main@aarch64",
"Red Hat Hardened Images:ruby3-3-main@noarch",
"Red Hat Hardened Images:ruby3-3-main@src",
"Red Hat Hardened Images:ruby3-3-main@x86_64"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-47241"
},
{
"category": "external",
"summary": "RHBZ#2491523",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2491523"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-47241",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-47241"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-47241",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-47241"
},
{
"category": "external",
"summary": "https://github.com/ruby/net-imap/security/advisories/GHSA-c4fp-cxrr-mj66",
"url": "https://github.com/ruby/net-imap/security/advisories/GHSA-c4fp-cxrr-mj66"
}
],
"release_date": "2026-06-22T20:11:04.329000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-15T21:40:28+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": [
"Red Hat Hardened Images:ruby3-3-main@aarch64",
"Red Hat Hardened Images:ruby3-3-main@noarch",
"Red Hat Hardened Images:ruby3-3-main@src",
"Red Hat Hardened Images:ruby3-3-main@x86_64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:40380"
},
{
"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.",
"product_ids": [
"Red Hat Hardened Images:ruby3-3-main@aarch64",
"Red Hat Hardened Images:ruby3-3-main@noarch",
"Red Hat Hardened Images:ruby3-3-main@src",
"Red Hat Hardened Images:ruby3-3-main@x86_64"
]
}
],
"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"
},
"products": [
"Red Hat Hardened Images:ruby3-3-main@aarch64",
"Red Hat Hardened Images:ruby3-3-main@noarch",
"Red Hat Hardened Images:ruby3-3-main@src",
"Red Hat Hardened Images:ruby3-3-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "net-imap: rubygem-net-imap: Net::IMAP: Denial of Service via malformed command 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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