RHSA-2026:77532
Vulnerability from csaf_redhat - Published: 2026-10-07 09:44 - Updated: 2026-10-12 22:57A flaw was found in Go's `crypto/x509` package. A remote attacker could exploit this by presenting a specially crafted certificate chain containing a large number of policy mappings. This inefficient validation process consumes excessive resources, which can lead to a denial of service (DoS) for applications or systems performing certificate validation.
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat OpenStack 1.5:registry.redhat.io/stf/sg-core-rhel9@sha256:ce27e2953ecba5d3cac72649da7b8490e83e655973df1c3f40560c4ea672afa7_amd64 | — |
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| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat OpenStack 1.5:registry.redhat.io/stf/prometheus-webhook-snmp-rhel9@sha256:4d016a5208197ddf8d28705e6d27640d4752604921050ed5aaa375d111f32d08_amd64 | — |
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| Unresolved product id: Red Hat OpenStack 1.5:registry.redhat.io/stf/service-telemetry-operator-bundle@sha256:9ea1393237b591f3643af0fd2036d75d0771db85b7cf36d61aa0d8b468bc7e25_amd64 | — |
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| Unresolved product id: Red Hat OpenStack 1.5:registry.redhat.io/stf/service-telemetry-rhel9-operator@sha256:7e97da5b0f9bbac33646021556d7f35f3c526f6538fbaa0f0fc5b7366b672f74_amd64 | — |
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| Unresolved product id: Red Hat OpenStack 1.5:registry.redhat.io/stf/sg-bridge-rhel9@sha256:03e5760749218cdd84e46360cb8d475586e564d7cbe72dcf233bae732698c9c8_amd64 | — |
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| Unresolved product id: Red Hat OpenStack 1.5:registry.redhat.io/stf/smart-gateway-operator-bundle@sha256:5de21a496ce353c1b63241661b24b0a032c89f68ef6c9666f3fd55cf8a6701c4_amd64 | — |
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| Unresolved product id: Red Hat OpenStack 1.5:registry.redhat.io/stf/smart-gateway-rhel9-operator@sha256:1e2a937e6ba42e3288038dbee7d4963543235faca5983a746326ecc03d19db97_amd64 | — |
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A flaw was found in the `net` package of Go (golang), specifically when using the `LookupCNAME` function with the `cgo` DNS resolver. A remote attacker could exploit this by providing a very long Canonical Name (CNAME) response. This can trigger a double-free of C memory, leading to a crash and a Denial of Service (DoS) for the affected application.
A flaw was found in the `encoding/asn1` package in Go. An attacker could provide a specially crafted, deeply-nested Abstract Syntax Notation One (ASN.1) structure, leading to excessive recursion during the `Unmarshal` operation. This could result in stack exhaustion and a Denial of Service (DoS) condition.
A flaw was found in the Golang MIME (Multipurpose Internet Mail Extensions) package. A remote attacker could exploit this vulnerability by sending a maliciously-crafted MIME header containing many invalid encoded-words. This could lead to excessive CPU consumption, resulting in a Denial of Service (DoS) for the affected system.
A flaw was found in `net/url`, a component of `golang`. This vulnerability arises when resolving relative paths that contain numerous parent directory ('..') segments. A remote attacker could exploit this by providing a specially crafted path, leading to quadratic time complexity and excessive memory allocation. This can result in a Denial of Service (DoS) due to resource exhaustion.
A flaw was found in pyasn1, a Python library for Abstract Syntax Notation One (ASN.1). The BER, CER, and DER decoders process OBJECT IDENTIFIER and RELATIVE-OID values in quadratic time relative to the number of arcs. A remote attacker could exploit this by providing a specially crafted payload containing an OID with many arcs, leading to excessive CPU consumption and a denial of service (DoS) in applications that decode untrusted ASN.1 data. The corresponding encoders also exhibit this quadratic behavior when re-encoding attacker-supplied values.
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat OpenStack 1.5:registry.redhat.io/stf/prometheus-webhook-snmp-rhel9@sha256:4d016a5208197ddf8d28705e6d27640d4752604921050ed5aaa375d111f32d08_amd64 | — |
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| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat OpenStack 1.5:registry.redhat.io/stf/service-telemetry-operator-bundle@sha256:9ea1393237b591f3643af0fd2036d75d0771db85b7cf36d61aa0d8b468bc7e25_amd64 | — |
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| Unresolved product id: Red Hat OpenStack 1.5:registry.redhat.io/stf/service-telemetry-rhel9-operator@sha256:7e97da5b0f9bbac33646021556d7f35f3c526f6538fbaa0f0fc5b7366b672f74_amd64 | — |
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| Unresolved product id: Red Hat OpenStack 1.5:registry.redhat.io/stf/sg-bridge-rhel9@sha256:03e5760749218cdd84e46360cb8d475586e564d7cbe72dcf233bae732698c9c8_amd64 | — |
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| Unresolved product id: Red Hat OpenStack 1.5:registry.redhat.io/stf/sg-core-rhel9@sha256:ce27e2953ecba5d3cac72649da7b8490e83e655973df1c3f40560c4ea672afa7_amd64 | — |
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| Unresolved product id: Red Hat OpenStack 1.5:registry.redhat.io/stf/smart-gateway-operator-bundle@sha256:5de21a496ce353c1b63241661b24b0a032c89f68ef6c9666f3fd55cf8a6701c4_amd64 | — |
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| Unresolved product id: Red Hat OpenStack 1.5:registry.redhat.io/stf/smart-gateway-rhel9-operator@sha256:1e2a937e6ba42e3288038dbee7d4963543235faca5983a746326ecc03d19db97_amd64 | — |
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A remote attacker can exploit this by providing specially crafted BER/CER/DER-encoded ASN.1 data with a large exponent in the REAL value. When the application subsequently prints, logs, compares, or performs arithmetic on the decoded value, this can cause excessive CPU and memory consumption, leading to a denial of service (DoS).
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"title": "Statement"
},
{
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}
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},
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{
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{
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},
{
"category": "other",
"text": "This is an Important denial of service flaw in the Go encoding/asn1 package, as it can be triggered remotely without authentication. An attacker can provide a malformed ASN.1 structure, causing excessive recursion during unmarshalling and leading to stack exhaustion, which can render the service unavailable.",
"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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},
{
"category": "external",
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},
{
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},
{
"category": "external",
"summary": "https://pkg.go.dev/vuln/GO-2026-5972",
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}
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"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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"title": "encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal"
},
{
"cve": "CVE-2026-42504",
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"id": "CWE-1050",
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"text": "A flaw was found in the Golang MIME (Multipurpose Internet Mail Extensions) package. A remote attacker could exploit this vulnerability by sending a maliciously-crafted MIME header containing many invalid encoded-words. This could lead to excessive CPU consumption, resulting in a Denial of Service (DoS) for the affected system.",
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},
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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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},
{
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"summary": "https://pkg.go.dev/vuln/GO-2026-5038",
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},
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{
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}
],
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"title": "Vulnerability description"
},
{
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"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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{
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"title": "Statement"
},
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"details": "The Service Telemetry Framework container image provided by this update can be downloaded from the Red Hat Container Registry at registry.access.redhat.com. Installation instructions for your platform are available at Red Hat Container\nCatalog (see References).\n\nDockerfiles and scripts should be amended either to refer to this new image specifically, or to the latest image generally.",
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"Red Hat OpenStack 1.5:registry.redhat.io/stf/prometheus-webhook-snmp-rhel9@sha256:4d016a5208197ddf8d28705e6d27640d4752604921050ed5aaa375d111f32d08_amd64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:77532"
},
{
"category": "workaround",
"details": "When processing untrusted ASN.1 data with pyasn1, avoid calling prettyPrint(), str(), float(), int(), or performing comparisons or arithmetic on decoded Real (ASN.1 REAL type) objects. Instead, inspect the raw (mantissa, base, exponent) tuple directly. Where logging decoded ASN.1 structures is necessary, filter out or sanitize Real-typed values before conversion.",
"product_ids": [
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"Red Hat OpenStack 1.5:registry.redhat.io/stf/sg-bridge-rhel9@sha256:03e5760749218cdd84e46360cb8d475586e564d7cbe72dcf233bae732698c9c8_amd64",
"Red Hat OpenStack 1.5:registry.redhat.io/stf/sg-core-rhel9@sha256:ce27e2953ecba5d3cac72649da7b8490e83e655973df1c3f40560c4ea672afa7_amd64",
"Red Hat OpenStack 1.5:registry.redhat.io/stf/smart-gateway-operator-bundle@sha256:5de21a496ce353c1b63241661b24b0a032c89f68ef6c9666f3fd55cf8a6701c4_amd64",
"Red Hat OpenStack 1.5:registry.redhat.io/stf/smart-gateway-rhel9-operator@sha256:1e2a937e6ba42e3288038dbee7d4963543235faca5983a746326ecc03d19db97_amd64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"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"
},
"products": [
"Red Hat OpenStack 1.5:registry.redhat.io/stf/prometheus-webhook-snmp-rhel9@sha256:4d016a5208197ddf8d28705e6d27640d4752604921050ed5aaa375d111f32d08_amd64",
"Red Hat OpenStack 1.5:registry.redhat.io/stf/service-telemetry-operator-bundle@sha256:9ea1393237b591f3643af0fd2036d75d0771db85b7cf36d61aa0d8b468bc7e25_amd64",
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"Red Hat OpenStack 1.5:registry.redhat.io/stf/sg-bridge-rhel9@sha256:03e5760749218cdd84e46360cb8d475586e564d7cbe72dcf233bae732698c9c8_amd64",
"Red Hat OpenStack 1.5:registry.redhat.io/stf/sg-core-rhel9@sha256:ce27e2953ecba5d3cac72649da7b8490e83e655973df1c3f40560c4ea672afa7_amd64",
"Red Hat OpenStack 1.5:registry.redhat.io/stf/smart-gateway-operator-bundle@sha256:5de21a496ce353c1b63241661b24b0a032c89f68ef6c9666f3fd55cf8a6701c4_amd64",
"Red Hat OpenStack 1.5:registry.redhat.io/stf/smart-gateway-rhel9-operator@sha256:1e2a937e6ba42e3288038dbee7d4963543235faca5983a746326ecc03d19db97_amd64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "pyasn1: pyasn1: Denial of Service via crafted ASN.1 REAL values"
}
]
}
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.
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.
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.