CVE-2026-30858 (GCVE-0-2026-30858)
Vulnerability from cvelistv5 – Published: 2026-03-07 16:34 – Updated: 2026-03-09 18:24
VLAI
EPSS
VEX
Title
WeKnora: DNS Rebinding Vulnerability in web_fetch Tool Allows SSRF to Internal Resources
Summary
WeKnora is an LLM-powered framework designed for deep document understanding and semantic retrieval. Prior to version 0.3.0, a DNS rebinding vulnerability in the web_fetch tool allows an unauthenticated attacker to bypass URL validation and access internal resources on the server, including private IP addresses (e.g., 127.0.0.1, 192.168.x.x). By crafting a malicious domain that resolves to a public IP during validation and subsequently resolves to a private IP during execution, an attacker can access sensitive local services and potentially exfiltrate data. This issue has been patched in version 0.3.0.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-09 17:52 UTC
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/Tencent/WeKnora/security/advis… | x_refsource_CONFIRM |
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FKIE_CVE-2026-30858
Vulnerability from fkie_nvd - Published: 2026-03-07 17:15 - Updated: 2026-06-17 10:33
Severity
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5 (High) - CVSS:3.1/
Summary
WeKnora is an LLM-powered framework designed for deep document understanding and semantic retrieval. Prior to version 0.3.0, a DNS rebinding vulnerability in the web_fetch tool allows an unauthenticated attacker to bypass URL validation and access internal resources on the server, including private IP addresses (e.g., 127.0.0.1, 192.168.x.x). By crafting a malicious domain that resolves to a public IP during validation and subsequently resolves to a private IP during execution, an attacker can access sensitive local services and potentially exfiltrate data. This issue has been patched in version 0.3.0.
References
| URL | Tags | ||
|---|---|---|---|
| security-advisories@github.com | https://github.com/Tencent/WeKnora/security/advisories/GHSA-h6gw-8f77-mmmp | Exploit, Vendor Advisory |
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GHSA-H6GW-8F77-MMMP
Vulnerability from github – Published: 2026-03-06 23:56 – Updated: 2026-03-09 13:21
VLAI
Summary
WeKnora has DNS Rebinding Vulnerability in web_fetch Tool that Allows SSRF to Internal Resources
Details
Summary
A DNS rebinding vulnerability in the web_fetch tool allows an unauthenticated attacker to bypass URL validation and access internal resources on the server, including private IP addresses (e.g., 127.0.0.1, 192.168.x.x). By crafting a malicious domain that resolves to a public IP during validation and subsequently resolves to a private IP during execution, an attacker can access sensitive local services and potentially exfiltrate data.
Details
The vulnerability exists because the web_fetch tool lacks complete DNS pinning. The application performs URL validation only once via validateParams(), but the URL is then passed unchanged to the fetchHTMLContent() function, which eventually reaches fetchWithChromedp(). The headless browser (Chromedp) resolves the hostname independently without DNS pinning, allowing a time-of-check-time-of-use (TOCTOU) attack.
Validation phase (first DNS resolution):
if err := t.validateParams(p); err != nil {
// Returns error for private IPs
results[index] = &webFetchItemResult{
err: err,
// ...
}
return
}
Execution phase (second DNS resolution): The original URL (not the resolved IP) is passed through the execution chain:
output, data, err := t.executeFetch(ctx, p)
// Calls fetchHTMLContent(ctx, targetURL) where targetURL is the original hostname
Chromedp execution (vulnerable DNS resolution):
func (t *WebFetchTool) fetchWithChromedp(ctx context.Context, targetURL string) (string, error) {
// targetURL is not DNS-pinned; browser resolves it independently
err := chromedp.Run(ctx,
chromedp.Navigate(targetURL), // Third DNS lookup occurs here
chromedp.WaitReady("body", chromedp.ByQuery),
chromedp.OuterHTML("html", &html),
)
}
The attacker controls a domain that can be configured to return different DNS responses to different queries, enabling them to bypass the initial private IP check and access restricted resources during the actual fetch.
PoC
Setup: 1. Deploy the DNS rebinding server (attached Python file) with the following systemd configuration:
```systemd [Unit] Description=DNS Rebinding Test Server After=network.target
[Service] Type=simple User=root WorkingDirectory=/root/Repos/dns-rebinding-server ExecStart=/root/.proto/shims/python -u /root/Repos/dns-rebinding-server/server.py --token aleister1102 --domain aleister.ninja --port 53 --global-tracking --ip1 1.1.1.1 --ip2 0.0.0.0 --first-response-count 1 --reset-time 0 Restart=always RestartSec=3
[Install] WantedBy=multi-user.target ```
This configures the DNS server to:
- Return 1.1.1.1 (a public IP) for the first DNS query
- Return 127.0.0.1 (localhost) for all subsequent queries
- TTL is set to 0 to prevent caching
The sequence can also be reset via reset.domain.com (reset to 1.1.1.1).
Note: We may need to reset the sequence as the TOCTOU attack is not truly reliable and needs to be triggered multiple times.
- Set up a simple HTTP server on the localhost of the backend service:
bash
python -m http.server 8888
- Configure the malicious domain to point to the DNS rebinding server
Execution:
1. Enable web search on an agent.
2. Prompt the agent to fetch content from the attacker-controlled domain (e.g., http://attacker.example.com)
3. The sequence of events:
- First DNS query (validation phase): attacker.example.com → 1.1.1.1 ✓ Passes validation
- Second DNS query (execution phase): attacker.example.com → 127.0.0.1 ✗ Bypass achieved
- The web_fetch tool successfully connects to 127.0.0.1:8080 and returns the local server's content
Result: The attacker gains access to the local HTTP server and can read its content, demonstrating that internal resources are now accessible through the rebinding attack.
PoC video:
https://github.com/user-attachments/assets/68daaa87-4b9b-4b6e-b6f6-ee123f5fcda9
Impact
Vulnerability Type: DNS Rebinding / Server-Side Request Forgery (SSRF)
Who is impacted: - Any user or agent with web search capability can exploit this vulnerability - The vulnerability grants access to internal services, configuration files, metadata services, and other sensitive resources normally restricted to the internal network - In cloud environments, this could allow access to metadata endpoints (e.g., AWS IMDSv1) to obtain credentials and secrets\
Severity
7.5 (High)
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 0.2.14"
},
"package": {
"ecosystem": "Go",
"name": "github.com/Tencent/WeKnora"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.3.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-30858"
],
"database_specific": {
"cwe_ids": [
"CWE-918"
],
"github_reviewed": true,
"github_reviewed_at": "2026-03-06T23:56:22Z",
"nvd_published_at": "2026-03-07T17:15:53Z",
"severity": "HIGH"
},
"details": "### Summary\n\nA DNS rebinding vulnerability in the `web_fetch` tool allows an unauthenticated attacker to bypass URL validation and access internal resources on the server, including private IP addresses (e.g., 127.0.0.1, 192.168.x.x). By crafting a malicious domain that resolves to a public IP during validation and subsequently resolves to a private IP during execution, an attacker can access sensitive local services and potentially exfiltrate data.\n\n### Details\n\nThe vulnerability exists because the `web_fetch` tool lacks complete DNS pinning. The application performs URL validation only once via `validateParams()`, but the URL is then passed unchanged to the `fetchHTMLContent()` function, which eventually reaches `fetchWithChromedp()`. The headless browser (Chromedp) resolves the hostname independently without DNS pinning, allowing a time-of-check-time-of-use (TOCTOU) attack.\n\n**Validation phase (first DNS resolution):**\n```go\nif err := t.validateParams(p); err != nil {\n // Returns error for private IPs\n results[index] = \u0026webFetchItemResult{\n err: err,\n // ...\n }\n return\n}\n```\n\n**Execution phase (second DNS resolution):**\nThe original URL (not the resolved IP) is passed through the execution chain:\n```go\noutput, data, err := t.executeFetch(ctx, p)\n// Calls fetchHTMLContent(ctx, targetURL) where targetURL is the original hostname\n```\n\n**Chromedp execution (vulnerable DNS resolution):**\n```go\nfunc (t *WebFetchTool) fetchWithChromedp(ctx context.Context, targetURL string) (string, error) {\n // targetURL is not DNS-pinned; browser resolves it independently\n err := chromedp.Run(ctx,\n chromedp.Navigate(targetURL), // Third DNS lookup occurs here\n chromedp.WaitReady(\"body\", chromedp.ByQuery),\n chromedp.OuterHTML(\"html\", \u0026html),\n )\n}\n```\n\nThe attacker controls a domain that can be configured to return different DNS responses to different queries, enabling them to bypass the initial private IP check and access restricted resources during the actual fetch.\n\n### PoC\n\n**Setup:**\n1. Deploy the DNS rebinding server (attached Python file) with the following systemd configuration:\n\n```systemd\n[Unit]\nDescription=DNS Rebinding Test Server\nAfter=network.target\n\n[Service]\nType=simple\nUser=root\nWorkingDirectory=/root/Repos/dns-rebinding-server\nExecStart=/root/.proto/shims/python -u /root/Repos/dns-rebinding-server/server.py --token aleister1102 --domain aleister.ninja --port 53 --global-tracking --ip1 1.1.1.1 --ip2 0.0.0.0 --first-response-count 1 --reset-time 0\nRestart=always\nRestartSec=3\n\n[Install]\nWantedBy=multi-user.target\n ```\n \n This configures the DNS server to:\n - Return `1.1.1.1` (a public IP) for the first DNS query\n - Return `127.0.0.1` (localhost) for all subsequent queries\n - TTL is set to 0 to prevent caching\n \n The sequence can also be reset via reset.domain.com (reset to 1.1.1.1).\n \n \u003e Note: We may need to reset the sequence as the TOCTOU attack is not truly reliable and needs to be triggered multiple times.\n\n2. Set up a simple HTTP server on the localhost of the backend service:\n\n ```bash\n python -m http.server 8888\n ```\n\n3. Configure the malicious domain to point to the DNS rebinding server\n\n**Execution:**\n1. Enable web search on an agent.\n2. Prompt the agent to fetch content from the attacker-controlled domain (e.g., `http://attacker.example.com`)\n3. The sequence of events:\n - **First DNS query** (validation phase): `attacker.example.com` \u2192 `1.1.1.1` \u2713 Passes validation\n - **Second DNS query** (execution phase): `attacker.example.com` \u2192 `127.0.0.1` \u2717 Bypass achieved\n - The `web_fetch` tool successfully connects to `127.0.0.1:8080` and returns the local server\u0027s content\n\n**Result:**\nThe attacker gains access to the local HTTP server and can read its content, demonstrating that internal resources are now accessible through the rebinding attack.\n\n\u003cimg width=\"1920\" height=\"1080\" alt=\"image\" src=\"https://github.com/user-attachments/assets/897e8494-f39e-49ce-a02a-5832bb84a73f\" /\u003e\n\nPoC video:\n\nhttps://github.com/user-attachments/assets/68daaa87-4b9b-4b6e-b6f6-ee123f5fcda9\n\n### Impact\n**Vulnerability Type:** DNS Rebinding / Server-Side Request Forgery (SSRF)\n\n**Who is impacted:**\n- Any user or agent with web search capability can exploit this vulnerability\n- The vulnerability grants access to internal services, configuration files, metadata services, and other sensitive resources normally restricted to the internal network\n- In cloud environments, this could allow access to metadata endpoints (e.g., AWS IMDSv1) to obtain credentials and secrets\\",
"id": "GHSA-h6gw-8f77-mmmp",
"modified": "2026-03-09T13:21:07Z",
"published": "2026-03-06T23:56:22Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/Tencent/WeKnora/security/advisories/GHSA-h6gw-8f77-mmmp"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-30858"
},
{
"type": "PACKAGE",
"url": "https://github.com/Tencent/WeKnora"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
}
],
"summary": "WeKnora has DNS Rebinding Vulnerability in web_fetch Tool that Allows SSRF to Internal Resources"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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