RHSA-2026:47085
Vulnerability from csaf_redhat - Published: 2026-07-28 14:15 - Updated: 2026-07-31 13:58Summary
Red Hat Security Advisory: rest security update
Severity
Important
Notes
Topic: An update for rest is now available for Red Hat Enterprise Linux 10.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: The rest packages provide a library for access to the RESTful web services.
Security Fix(es):
* librest: weak random number generation in PKCE implementation (CVE-2026-16615)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
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 librest. The PKCE implementation for OAuth authorization uses the GRand function from the GLib API, a cryptographically insecure pseudo-random number generator. Because the generated "code verifier" lacks sufficient cryptographic entropy, a malicious actor can reverse-engineer the pseudo-random number generator (PRNG) seed to predict or reconstruct the code verifier string, allowing an attacker to bypass PKCE protections and successfully impersonate the client during the OAuth 2.0 authorization flow.
6.8 (Medium)
Affected products
Fixed
33 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:rest-0:0.9.1-11.el10_2.1.aarch64 | — |
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| Unresolved product id: AppStream-10.2.Z:rest-0:0.9.1-11.el10_2.1.ppc64le | — |
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| Unresolved product id: AppStream-10.2.Z:rest-0:0.9.1-11.el10_2.1.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:rest-0:0.9.1-11.el10_2.1.src | — |
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| Unresolved product id: AppStream-10.2.Z:rest-0:0.9.1-11.el10_2.1.x86_64 | — |
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| Unresolved product id: AppStream-10.2.Z:rest-debuginfo-0:0.9.1-11.el10_2.1.aarch64 | — |
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| Unresolved product id: AppStream-10.2.Z:rest-debuginfo-0:0.9.1-11.el10_2.1.ppc64le | — |
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fix
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| Unresolved product id: AppStream-10.2.Z:rest-debuginfo-0:0.9.1-11.el10_2.1.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:rest-debuginfo-0:0.9.1-11.el10_2.1.x86_64 | — |
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| Unresolved product id: AppStream-10.2.Z:rest-debugsource-0:0.9.1-11.el10_2.1.aarch64 | — |
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| Unresolved product id: AppStream-10.2.Z:rest-debugsource-0:0.9.1-11.el10_2.1.ppc64le | — |
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| Unresolved product id: AppStream-10.2.Z:rest-debugsource-0:0.9.1-11.el10_2.1.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:rest-debugsource-0:0.9.1-11.el10_2.1.x86_64 | — |
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fix
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| Unresolved product id: AppStream-10.2.Z:rest-demo-debuginfo-0:0.9.1-11.el10_2.1.aarch64 | — |
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fix
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|
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| Unresolved product id: AppStream-10.2.Z:rest-demo-debuginfo-0:0.9.1-11.el10_2.1.ppc64le | — |
Vendor Fix
fix
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|
|
| Unresolved product id: AppStream-10.2.Z:rest-demo-debuginfo-0:0.9.1-11.el10_2.1.s390x | — |
Vendor Fix
fix
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|
|
| Unresolved product id: AppStream-10.2.Z:rest-demo-debuginfo-0:0.9.1-11.el10_2.1.x86_64 | — |
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fix
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|
|
| Unresolved product id: CRB-10.2.Z:rest-debuginfo-0:0.9.1-11.el10_2.1.aarch64 | — |
Vendor Fix
fix
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|
|
| Unresolved product id: CRB-10.2.Z:rest-debuginfo-0:0.9.1-11.el10_2.1.ppc64le | — |
Vendor Fix
fix
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|
|
| Unresolved product id: CRB-10.2.Z:rest-debuginfo-0:0.9.1-11.el10_2.1.s390x | — |
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fix
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|
|
| Unresolved product id: CRB-10.2.Z:rest-debuginfo-0:0.9.1-11.el10_2.1.x86_64 | — |
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fix
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|
|
| Unresolved product id: CRB-10.2.Z:rest-debugsource-0:0.9.1-11.el10_2.1.aarch64 | — |
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fix
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|
|
| Unresolved product id: CRB-10.2.Z:rest-debugsource-0:0.9.1-11.el10_2.1.ppc64le | — |
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fix
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|
|
| Unresolved product id: CRB-10.2.Z:rest-debugsource-0:0.9.1-11.el10_2.1.s390x | — |
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fix
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|
|
| Unresolved product id: CRB-10.2.Z:rest-debugsource-0:0.9.1-11.el10_2.1.x86_64 | — |
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fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:rest-demo-debuginfo-0:0.9.1-11.el10_2.1.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:rest-demo-debuginfo-0:0.9.1-11.el10_2.1.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:rest-demo-debuginfo-0:0.9.1-11.el10_2.1.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:rest-demo-debuginfo-0:0.9.1-11.el10_2.1.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:rest-devel-0:0.9.1-11.el10_2.1.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:rest-devel-0:0.9.1-11.el10_2.1.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:rest-devel-0:0.9.1-11.el10_2.1.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:rest-devel-0:0.9.1-11.el10_2.1.x86_64 | — |
Vendor Fix
fix
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|
Threats
Impact
Important
References
9 references
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:47085"
},
{
"category": "workaround",
"details": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.8,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
"version": "3.1"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "librest: weak random number generation in PKCE implementation"
}
]
}
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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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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.
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.
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