RHSA-2026:42045
Vulnerability from csaf_redhat - Published: 2026-07-20 13:31 - Updated: 2026-08-25 16:26Summary
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:
jaeger:
* jaeger-2.19.0-1.2.hum1 (aarch64, x86_64)
* jaeger-2.19.0-1.2.hum1.src (src)
Security Fix(es):
jaeger:
* CVE-2026-49852
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 the joserfc Python library. A remote attacker can exploit a vulnerability in the `joserfc.jwt.decode` function to forge HMAC-signed tokens. This occurs because the library accepts tokens signed with an empty or null verification key, allowing an attacker to bypass integrity checks. Successful exploitation could lead to an integrity compromise of data processed by the library.
7.5 (High)
Affected products
Fixed
3 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:jaeger-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:jaeger-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:jaeger-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
References
12 references
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"text": "This update includes the following RPMs:\n\njaeger:\n * jaeger-2.19.0-1.2.hum1 (aarch64, x86_64)\n * jaeger-2.19.0-1.2.hum1.src (src)\n\nSecurity Fix(es):\n\njaeger:\n * CVE-2026-49852",
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"vulnerabilities": [
{
"cve": "CVE-2026-49852",
"cwe": {
"id": "CWE-347",
"name": "Improper Verification of Cryptographic Signature"
},
"discovery_date": "2026-07-17T20:01:42.596923+00:00",
"ids": [
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"text": "2501881"
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"notes": [
{
"category": "description",
"text": "A flaw was found in the joserfc Python library. A remote attacker can exploit a vulnerability in the `joserfc.jwt.decode` function to forge HMAC-signed tokens. This occurs because the library accepts tokens signed with an empty or null verification key, allowing an attacker to bypass integrity checks. Successful exploitation could lead to an integrity compromise of data processed by the library.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "joserfc: joserfc: Integrity bypass via forged HMAC-signed tokens",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "CVE-2026-49852 is an integrity/authentication bypass in the joserfc Python library (CWE-347): joserfc.jwt.decode accepts attacker-forged HMAC-signed tokens when the verification key is an empty string or None, allowing an attacker to forge valid-looking JWTs. It is fixed in joserfc 1.6.8. Red Hat rates this Important, consistent with the upstream/CVEORG assessment.\n\njoserfc is bundled by a number of Red Hat product and services container images. Version triage against the fixed version (1.6.8) shows only two shipping components carried a vulnerable joserfc (1.6.5) and are marked Affected: OpenShift Virtualization (CNV) 4.22 (ocp-virt-validation-checkup) and OpenShift Dedicated / hosted control planes (ask-sre). All other Red Hat components that bundle joserfc ship 1.6.8 or later (1.7.1-1.7.4) and are Not Affected because the vulnerable code is not present. The Red Hat Hardened Images (Hummingbird) jaeger package shipped an affected joserfc (1.6.7) and has already been remediated (rebuilt with joserfc 1.7.1, HUM-4648).",
"title": "Statement"
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{
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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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"product_status": {
"fixed": [
"Red Hat Hardened Images:jaeger-main@aarch64",
"Red Hat Hardened Images:jaeger-main@src",
"Red Hat Hardened Images:jaeger-main@x86_64"
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"summary": "RHBZ#2501881",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2501881"
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{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-49852",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-49852"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-49852",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-49852"
},
{
"category": "external",
"summary": "https://github.com/authlib/joserfc/commit/86d00910b2b2d2d07503fee9b572906daefab7f1",
"url": "https://github.com/authlib/joserfc/commit/86d00910b2b2d2d07503fee9b572906daefab7f1"
},
{
"category": "external",
"summary": "https://github.com/authlib/joserfc/releases/tag/1.6.8",
"url": "https://github.com/authlib/joserfc/releases/tag/1.6.8"
},
{
"category": "external",
"summary": "https://github.com/authlib/joserfc/security/advisories/GHSA-gg9x-qcx2-xmrh",
"url": "https://github.com/authlib/joserfc/security/advisories/GHSA-gg9x-qcx2-xmrh"
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"release_date": "2026-07-17T19:14:58.019000+00:00",
"remediations": [
{
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"date": "2026-07-20T13:31:07+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:jaeger-main@aarch64",
"Red Hat Hardened Images:jaeger-main@src",
"Red Hat Hardened Images:jaeger-main@x86_64"
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"url": "https://access.redhat.com/errata/RHSA-2026:42045"
},
{
"category": "workaround",
"details": "This flaw is only exploitable when an application invokes joserfc.jwt.decode with an empty-string or None verification key. Ensuring a valid, non-empty key is always supplied to JWT verification prevents exploitation. Upgrading joserfc to 1.6.8 or later fully remediates the flaw regardless of how the verification key is supplied.",
"product_ids": [
"Red Hat Hardened Images:jaeger-main@aarch64",
"Red Hat Hardened Images:jaeger-main@src",
"Red Hat Hardened Images:jaeger-main@x86_64"
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],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:jaeger-main@aarch64",
"Red Hat Hardened Images:jaeger-main@src",
"Red Hat Hardened Images:jaeger-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "joserfc: joserfc: Integrity bypass via forged HMAC-signed tokens"
}
]
}
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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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