Security readout for executives and security teams
Plain-English summary
CVE-2026-27630 can let an unauthenticated remote attacker make TinyWeb unavailable by tying up server threads and memory with many slow connections. It affects TinyWeb versions before 2.02. The issue is availability-only, but it can disrupt any service hosted on vulnerable TinyWeb deployments.
Executive priority
Prioritize remediation for internet-facing TinyWeb services because exploitation requires no credentials and can cause service outage. Internal-only deployments are lower urgency but should still be upgraded during normal maintenance.
Technical view
TinyWeb before 2.02 creates a new OS thread per incoming connection without a maximum concurrency limit or suitable request timeout. This enables Slowloris-style resource exhaustion over the network without authentication or user interaction. Version 2.02 adds a 512-connection cap and a 30-second idle connection timeout.
Likely exposure
Organizations are exposed if they host HTTP or HTTPS services using TinyWeb versions earlier than 2.02, especially if the service is reachable from untrusted networks or the internet.
Exploitation context
Sources describe a remote, unauthenticated denial-of-service condition using slow connection behavior. The CVE is not listed as KEV, and the provided sources do not state active exploitation in the wild.
Researcher notes
The public record identifies CWE-400 resource exhaustion and CVSS 4.0 score 8.7. Evidence supports an availability impact only; confidentiality and integrity impacts are not indicated. The fix is documented as commit 23268c8 and TinyWeb 2.02.
Mitigation direction
- Upgrade TinyWeb to version 2.02 or later.
- If upgrade is delayed, place TinyWeb behind a robust reverse proxy or WAF.
- Configure proxy connection limits, request buffering, and aggressive idle timeouts.
- Limit direct internet exposure to TinyWeb where possible.
- Monitor for abnormal connection counts, thread growth, and memory pressure.
Validation and detection
- Inventory systems running TinyWeb and identify exposed HTTP or HTTPS services.
- Confirm TinyWeb version is 2.02 or later.
- Review whether the 2.02 connection cap and idle timeout are present.
- Verify reverse proxy or WAF timeout and connection-limit settings.
- Check logs and telemetry for availability incidents tied to connection exhaustion.
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-400: Exact CWE lookup
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Open ATT&CK lookupCVE-2026-27630 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
- 8.7 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
8.7HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/maximmasiutin/TinyWeb/security/advisories/GHSA-ccv5-8948-c99cCVE reference · x_refsource_CONFIRM
- https://github.com/maximmasiutin/TinyWeb/commit/23268c8CVE reference · x_refsource_MISC
- https://www.masiutin.net/tinyweb-cve-2026-27630.htmlCVE 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.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.