Red Hat Updates Jackson Libraries Against Denial of Service
Tech GuruQuick Answer
The Jackson erratum addresses resource exhaustion in numeric parsing and forward-reference completion, CVE-2026-68497 and CVE-2026-91777. Match installed packages and support entitlements to the errata, apply the supported fixes, validate service operation, and retain evidence.
Confirm Scope And Apply The Supported Remediation
What to do now: Identify Java services using RHEL-provided Jackson packages and distinguish those packages from application-bundled dependencies. Match product, architecture, package epoch/version/release and support stream to the individual erratum; apply each CVE only where its documented prerequisites hold. Apply the coordinated Jackson package set from RHSA-2026:93444 through the entitled repository, and redeploy or restart affected Java services. Confirm the active dependency set and test representative JSON inputs, forward references and resource limits; retain package and application-test evidence.
Last verified: 2026-11-02 UTC. Recheck the authoritative advisory and supported distribution channel before changing production.
Scope And Authority
| Product scope | Jackson packages on RHEL 9.4 AppStream E4S |
|---|---|
| Advisory | RHSA-2026:93444 |
| CVEs | CVE-2026-68497, CVE-2026-91777 |
| Authoritative release date | 2026-11-02T02:39:20Z (latest release in this group; individual release dates below) |
| Authority revision date | 2026-11-02T02:40:05Z (latest authority revision in this group) |
| Affected versions | Advisory-listed packages before the corresponding fixed builds on Red Hat Enterprise Linux AppStream E4S (v.9.4). |
| Fixed version | jackson-annotations-0:2.21-1.el9_4.1.src; jackson-core-0:2.21.6-1.el9_4.src; jackson-databind-0:2.21.6-1.el9_4.1.src; jackson-jaxrs-providers-0:2.21.6-1.el9_4.src; jackson-modules-base-0:2.21.6-1.el9_4.src |
| CVSS base score | 7.5 (CVSS v3.1; CVE-specific) |
| CVSS severity | High |
| Exploitation status | The cited Red Hat advisories do not state that these issues are being maliciously exploited.; no exploitation claim is inferred. |
Authority-Specific Scope And Version Evidence
| RHSA-2026:93444 | Released 2026-11-02T02:39:20Z; revised 2026-11-02T02:40:05Z. Red Hat Enterprise Linux AppStream E4S (v.9.4). Fixed source package families: jackson-annotations-0:2.21-1.el9_4.1.src; jackson-core-0:2.21.6-1.el9_4.src; jackson-databind-0:2.21.6-1.el9_4.1.src; jackson-jaxrs-providers-0:2.21.6-1.el9_4.src; jackson-modules-base-0:2.21.6-1.el9_4.src. CVSS: 7.5 (CVSS v3.1; CVE-specific); High. Vendor rating: Important. |
|---|
What Changed
The Jackson erratum addresses resource exhaustion in numeric parsing and forward-reference completion, CVE-2026-68497 and CVE-2026-91777.
What To Validate Now
- Inventory. Identify Java services using RHEL-provided Jackson packages and distinguish those packages from application-bundled dependencies.
- Establish applicability. Match product, architecture, package epoch/version/release and support stream to the individual erratum; apply each CVE only where its documented prerequisites hold.
- Remediate. Apply the coordinated Jackson package set from RHSA-2026:93444 through the entitled repository, and redeploy or restart affected Java services.
- Validate. Confirm the active dependency set and test representative JSON inputs, forward references and resource limits; retain package and application-test evidence.
- Retain evidence. Preserve asset and owner identifiers, the applicability decision, before-and-after versions, change approval, installation output, validation results, and any exception or rollback record.
Operational Cautions
Updating system RPMs does not prove that a separately bundled JAR was updated. Assess bundled dependencies through their own supported release channel. CVSS values are the authority-provided per-CVE scores, not a score for the whole update. Retain the advisory, inventory, approval, package and validation records.
Evidence To Retain
- Exact product, release stream, package or application version, enabled feature, environment, and accountable owner.
- UTC timestamps, authority revision, approved change record, installer or package-manager output, and resulting version.
- Relevant logs and monitoring evidence, test results, exceptions, compensating controls, and rollback decisions.
Related TechGeeks Resources
Authoritative References
Correction policy: If the authority changes affected versions, fixed versions, severity, exploitation information, mitigations, or required action, TechGeeks will update this notice and its verification date.
