Security readout for executives and security teams
Plain-English summary
Traefik deployments using ACME TLS-ALPN certificate automation can be made unavailable by unauthenticated network clients tying up connection resources. The issue affects Traefik before 2.11.35 and 3.0.0-beta1 through before 3.6.7. Fixed releases are available. No active exploitation is stated in the provided sources.
Executive priority
Prioritize patching exposed Traefik instances using ACME TLS-ALPN because the business impact is service disruption. This is not currently evidenced as exploited in the supplied sources, so treat it as a timely availability-risk update rather than an emergency compromise event.
Technical view
CVE-2026-22045 is a CWE-770 resource exhaustion flaw in Traefik’s ACME TLS-ALPN fast path. Without appropriate timeout and close behavior during a stalled handshake, clients can hold goroutines and file descriptors indefinitely, potentially causing denial of service on the affected entry point. CVSS 3.1 is 5.9, with high availability impact.
Likely exposure
Internet-facing Traefik entry points are most relevant if they run affected versions and have ACME TLS-ALPN challenge handling enabled. Deployments not using ACME TLS-ALPN are less likely to match the vulnerable condition, based on the advisory description.
Exploitation context
The sources describe unauthenticated network access as sufficient, but exploitation complexity is rated high. The impact is availability only; confidentiality and integrity are not affected. The provided bundle does not indicate CISA KEV listing or confirmed in-the-wild exploitation.
Researcher notes
The public record attributes the fix to releases 2.11.35 and 3.6.7 and references commit e9f3089e9045812bcf1b410a9d40568917b26c3d. Focus validation on affected version ranges and ACME TLS-ALPN enablement. Avoid assuming exposure for Traefik deployments using other ACME challenge methods unless confirmed.
Mitigation direction
- Upgrade Traefik 2.x deployments to 2.11.35 or later.
- Upgrade Traefik 3.x deployments to 3.6.7 or later.
- Review the Traefik advisory for environment-specific guidance.
- If upgrade is delayed, assess whether ACME TLS-ALPN is required.
Validation and detection
- Inventory Traefik versions across production and edge environments.
- Confirm whether ACME TLS-ALPN challenge handling is enabled.
- Identify public entry points served by affected Traefik instances.
- Verify upgraded instances report version 2.11.35, 3.6.7, or later.
- Monitor affected entry points for unusual connection, file descriptor, or goroutine growth.
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-770: 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 lookupCVE-2026-22045 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
- Medium
- CVSS
- 5.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/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.
CVSS vector scores
1 official scoreWe 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:H/PR:N/UI:N/S:U/C:N/I:N/A:H2.23.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.9MediumVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/traefik/traefik/security/advisories/GHSA-cwjm-3f7h-9hwqCVE reference · x_refsource_CONFIRM
- https://github.com/traefik/traefik/commit/e9f3089e9045812bcf1b410a9d40568917b26c3dCVE reference · x_refsource_MISC
- https://github.com/traefik/traefik/releases/tag/v2.11.35CVE reference · x_refsource_MISC
- https://github.com/traefik/traefik/releases/tag/v3.6.7CVE reference · x_refsource_MISC
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.
Allocation of Resources Without Limits or Throttling
Allocation of Resources Without Limits or Throttling represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.