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Blind SSRF in Crawl4AI Docker server via CacheValidator freshness check

Priority HIGH 70CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-918 and the CVSS impact.

Summary

Crawl4AI before 0.9.5 contains a blind server-side request forgery flaw in its Docker server, tracked as CWE-918. An API client can bypass the egress proxy by enabling check_cache_freshness, so an unauthenticated remote attacker can cache a controlled URL and make the server follow 302 redirects or DNS rebinding to internal and cloud-metadata addresses. The attacker receives no response data, so the flaw is used for port and service discovery.

Written with Claude Haiku 5.5 from the sources below · 2026-10-30

Description from the CNA

Crawl4AI before 0.9.5 contains a blind server-side request forgery vulnerability in the Docker server that allows API clients to bypass the egress proxy by enabling check_cache_freshness. Attackers can cache a controlled URL, then trigger CacheValidator to follow 302 redirects or DNS rebinding to internal and cloud-metadata addresses for port and service discovery.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0037 31st percentileScored 2026-11-07
Fix Fixed crawl4ai (unclecode): 0.9.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
unclecodecrawl4aibefore 0.9.50.9.5Patch availableCNA
  • crawl4ai Vendorunclecode Affected before 0.9.5 Fixed in 0.9.5 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:kidocode:crawl4ai:*:*:*:*:*:*:*:*——unclecode
  • cpe:2.3:a:kidocode:crawl4ai:*:*:*:*:*:*:*:* Versions — — ·unclecode

Remediation

Update crawl4ai to version 0.9.5, which fixes the flaw.

Written with Claude Haiku 5.5 from the sources below · 2026-10-30

  • Fix · CNA crawl4ai (unclecode) Fixed in 0.9.5

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    unclecode crawl4ai 0.9.5

    5 records Highest priority Priority HIGH 4 HIGH, 1 LOW

    Other records, highest priority first

    • TI-2026-82637 Denial of service in Crawl4AI via unbounded CrawlerRunConfig delay fieldsPriority HIGH 77
    • TI-2026-82638 Untrusted model loading in Crawl4AI via CosineStrategy model_namePriority HIGH 69
    • TI-2026-82636 Crawl4AI ignores certificate errors, enabling interception of crawlsPriority HIGH 69

Timeline

  1. 2026-10-29 Threatist record created from CVE-2026-119122
  2. 2026-10-29 Alias added: GHSA-3mhc-98p7-hp8w
  3. 2026-10-29 CISA SSVC decision points changed
  4. 2026-10-29 Priority changed: MEDIUM → HIGH

References

  • TI-2026-38760 Crawl4AI: AST Sandbox Escape via gi_frame.f_back Chain - Pre-Auth RCE in Docker API CVSS 3.1CRITICAL 10.0
  • TI-2026-40630 Crawl4AI - Authentication Bypass via Hardcoded JWT Signing Key CVSS 4.0CRITICAL 9.3
  • TI-2026-82637 Denial of service in Crawl4AI via unbounded CrawlerRunConfig delay fields CVSS 4.0HIGH 8.7
  • TI-2026-62075 crawl4ai before 0.9.3 Arbitrary File Write via PDFContentScrapingStrategy CVSS 4.0HIGH 8.7
  • TI-2026-82638 Untrusted model loading in Crawl4AI via CosineStrategy model_name CVSS 4.0HIGH 7.7
  • TI-2026-82636 Crawl4AI ignores certificate errors, enabling interception of crawls CVSS 4.0HIGH 8.3
See all 32 →

Sources