Security readout for executives and security teams
Plain-English summary
CVE-2026-1584 is a GnuTLS flaw that can let an unauthenticated remote attacker crash an affected TLS server. The described impact is denial of service, not data theft or code execution. Red Hat marks Red Hat Hardened Images gnutls-main 3.8.12-1.1.hum1 as affected, while listed RHEL and OpenShift entries are unaffected.
Executive priority
Treat as high priority for availability-sensitive services using affected Red Hat Hardened Images. It does not indicate data exposure or takeover, but unauthenticated network-triggered crashes can disrupt customer-facing systems and operations.
Technical view
A crafted TLS ClientHello containing an invalid PSK binder can trigger a NULL pointer dereference in GnuTLS during handshake processing. The CVSS 3.1 score is 7.5 with network attack vector, low complexity, no privileges, no user interaction, and high availability impact only.
Likely exposure
Exposure is most likely where Red Hat Hardened Images include the affected gnutls-main package and terminate TLS using GnuTLS. The provided Red Hat data lists RHEL 6, 7, 8, 9, 10 and OpenShift Container Platform 4 rhcos as unaffected.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation. The issue is remotely reachable and unauthenticated, so vulnerable internet-facing TLS services would be more urgent, but the documented outcome is service crash rather than compromise.
Researcher notes
Focus validation on package provenance and runtime reachability. The key primitive is a NULL pointer dereference during TLS handshake handling of an invalid PSK binder. Do not assume impact beyond denial of service without additional vendor evidence.
Mitigation direction
- Identify Red Hat Hardened Images using gnutls-main 3.8.12-1.1.hum1.
- Review and apply Red Hat guidance in RHSA-2026:7477.
- Prioritize internet-facing TLS services and high-availability systems first.
- Monitor Red Hat CVE and Bugzilla pages for updated fixed-version details.
- Use service redundancy where patching must be delayed.
Validation and detection
- Inventory deployed images and packages for gnutls-main version 3.8.12-1.1.hum1.
- Confirm whether affected containers or hosts expose TLS services remotely.
- Check Red Hat VEX status for each product in scope.
- Verify patched systems no longer report the affected package version.
- Review crash logs for GnuTLS-related TLS handshake failures.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-476: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupContainer behavior lookup
The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-1584 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6redhatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6redhat-SADPVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- ADP timelineredhat-SADP
Reported to Red Hat.
- Source timelineredhat
Reported to Red Hat.
- ADP timelineredhat-SADP
Made public.
- Source timelineredhat
Made public.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2026-01-29T12:18:41.916Z: Reported to Red Hat.
- 2026-02-09T00:00:00.000Z: Made public.
Source materials
- CVE List V5 sourceCVE List V5
- RHSA-2026:7477CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-1584CVE reference, redhat · vdb-entry, x_refsource_REDHAT
- RHBZ#2435258CVE reference, redhat · issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1584.jsonCVE reference, redhat-SADP · x_sadp-csaf-vex
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.