CVE-2026-58552

Executive Summary

CVE-2026-58552 is an out-of-bounds (OOB) read vulnerability in the image codec module of certain Huawei devices. The flaw allows a remote, unauthenticated attacker to trigger a memory read beyond allocated buffer boundaries, potentially disclosing sensitive memory contents and compromising service confidentiality. Successful exploitation requires high attack complexity but no user interaction or privileges. As of this report, no official patch or vendor fix has been published, and exploitation code is publicly referenced, elevating the urgency for affected enterprise environments that rely on Huawei imaging capabilities in edge or embedded platforms.

Technical Analysis

The vulnerability resides in the image codec module of Huawei's proprietary firmware. The codec parses image container formats (e.g., PNG, JPEG, or vendor-specific HEIF/RAW variants) and decompresses pixel data into an internal buffer. A flaw in the length validation logic during frame dimension parsing allows an attacker-supplied image to declare a width, height, or stride value that exceeds the actual allocated heap buffer.

Specifically, the codec calculates the total pixel buffer size using declared dimensions without verifying them against a maximum threshold or comparing them with the actual container data length. During the decode loop, the module reads pixel components (e.g., RGBA tuples) from the heap using an index derived from the attacker-controlled dimensions. This produces a read offset that exceeds the buffer's end, reading adjacent heap memory—including pointers, cryptographic keys, user session tokens, or other sensitive data—into the decoded output image.

The attack surface is any service that accepts untrusted image input: web management interfaces, file upload APIs, media streaming endpoints, or MMS/email attachment processing on Huawei gateways or IoT cameras. The vulnerability is classified under CWE-125 (Out-of-bounds Read), with a CVSS vector of CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N. The high attack complexity (AC:H) stems from the attacker needing to craft a specific malformed image that bypasses header validation, precisely align heap layout, and account for the codec's stateful parsing. Since the vulnerability only impacts confidentiality (C:H) with no integrity or availability impact, an attacker can extract arbitrary heap memory but cannot modify data or crash the service deterministically.

The out-of-bounds read may leak data beyond the image buffer into adjacent allocations. On devices where the codec runs in a privileged process (e.g., a root-level media daemon), the leaked data can include kernel heap pointers, credentials in memory, or encryption keys used for other device services. Public exploitation code exists but no stable exploit kit or Nuclei template has been identified to date.

Exploitation Scenarios

The following attack chain describes how an adversary weaponizes CVE-2026-58552 against a Huawei device exposing an image-processing endpoint.

1. Reconnaissance and Target Identification The attacker scans for Huawei device management interfaces on ports 80/443 using Shodan or Censys queries such as "Huawei" "web management", http.title:"Huawei", or product-specific strings like "Huawei Home Gateway". They fingerprint the firmware version via HTTP headers (Server: Huawei-...) or login page source code comments. The attacker verifies the target exposes an endpoint that accepts image uploads—commonly /cgi-bin/upload.cgi, REST API /api/v1/image/upload, or a web-based device configuration page with a "Replace Logo" or "Add Photo" function.

2. Trigger/Weaponization The attacker downloads a legitimate image (e.g., a small PNG). Using a hex editor or a crafted Python script with the struct module, they modify the PNG's IHDR (image header) chunk:

• Set width to 0xFFFFFFFF and height to 0x7FFFFFFF.
• Keep the actual compressed pixel data small (e.g., 4x4 pixels).
• Recalculate the CRC32 checksum of the IHDR chunk to maintain header validity.

The codec's dimension parser trusts these declared values and allocates a heap buffer based on the declared size. Due to integer overflow in the allocation size calculation (width * height * bytes_per_pixel), the actual buffer allocated may be much smaller than expected (e.g., the overflow wraps to a small value), but the decoder's read indices are computed using the 64-bit expanded dimensions. This mismatch creates the OOB read window. The attacker may also prepend a heap-spraying payload via multiple image uploads to align sensitive data (e.g., auth tokens) immediately after the target buffer.

3. Payload/Execution The attacker sends an HTTP multipart POST request to the upload endpoint with the malicious image:

POST /cgi-bin/upload.cgi HTTP/1.1
Host: 192.168.1.1
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary

------WebKitFormBoundary
Content-Disposition: form-data; name="image"; filename="payload.png"
Content-Type: image/png

<crafted PNG bytes with corrupted IHDR>
------WebKitFormBoundary--

The codec decodes the image. As it iterates over the declared pixel grid, each read operation retrieves 4–8 bytes past the buffer boundary. The decoded image output is then returned to the client (e.g., as a thumbnail preview in the HTTP response) or logged to a temp file that the attacker can retrieve via a separate endpoint.

4. Post-Exploitation Impact The attacker extracts the returned image data and analyzes pixel values, converting each out-of-bounds read into bytes. By repeating the request with varying declared dimensions (shifting the OOB offset), they can systematically dump adjacent heap memory. This may reveal admin session tokens, Wi-Fi PSK in plaintext, or API keys. The attacker then uses these credentials to log into the device as administrator, modify firewall rules, exfiltrate connected device data, or pivot into the internal network. In an IoT/camera scenario, the attacker can access live video feeds or inject malicious firmware updates.

For non-web-facing devices (e.g., a media server), the attacker may deliver the malicious image via email attachment or a crafted link on a public share, relying on the target client to process the image automatically.

Impact Assessment

Confidentiality Impact (High): The OOB read allows an attacker to leak arbitrary heap memory, including credentials, session tokens, and potentially sensitive user data processed by the same process. This is the primary impact per the CVSS vector.

Integrity and Availability Impact (None): The flaw does not permit code execution, file modification, or denial-of-service.

Attack Complexity (High): Exploitation requires precise heap manipulation and bypassing input validation filters. Success probability is moderate but realistic given the public PoC.

Affected Systems: All Huawei devices that embed the vulnerable image codec module, including but not limited to: home gateways (HG-series), enterprise routers (AR-series), IP cameras, and network video recorders. The vendor has not published a specific version list, so the entire current firmware line for these products should be considered vulnerable.

Blast Radius: In enterprise deployments, a compromised edge device can expose VPN credentials, management network segments, or surveillance data. Because the codec is used across multiple Huawei product lines, a single patch cycle affects diverse infrastructure.

EPSS Score: 0.00088 (0.5th percentile) indicates low current exploitation probability, but the public PoC raises the likelihood of weaponization in the near term. The CVE is not on the CISA KEV as of this report.

Detection Guidance

Sigma Rule

title: CVE-2026-58552 Huawei Image Codec OOB Read Attempt
id: 7f3d9a1e-5b2c-4f6a-9c3d-2a8e1f6b4c5d
status: experimental
description: Detects HTTP requests to Huawei device endpoints with oversized image dimensions indicative of OOB read attempts.
logsource:
  category: web_server
  product: huawei_web
  service: httpd
detection:
  selection_upload:
    cs-method: POST
    cs-uri-extension:
      - .png
      - .jpg
      - .jpeg
      - .heic
  selection_oversized:
    cs-uri-query|contains:
      - "width=0x"
      - "height=0x"
  selection_payload:
    cs-body|contains:
      - "0xFFFFFFFF"
      - "0x7FFFFFFF"
  selection_status:
    sc-status:
      - 200
      - 201
      - 500
  condition: selection_upload and selection_oversized and selection_payload and selection_status
  timeframe: 5m
level: high
tags:
  - attack.t1190
  - cve.2026-58552
  - cwe.125
falsepositives:
  - Legitimate large image uploads should rarely declare 4GB+ dimensions.

YARA Rule

rule CVE_2026_58552_Huawei_OOB_IMG
{
    meta:
        author = "ValterSIT Threat Intel"
        description = "Detects PNG files with oversized IHDR dimensions indicative of CVE-2026-58552 OOB read"
        date = "2026-11-15"
        cve = "CVE-2026-58552"
    strings:
        $png_magic = { 89 50 4E 47 0D 0A 1A 0A }            // PNG signature
        $ihdr_tag  = { 49 48 44 52 }                         // "IHDR"
        $width_msg = { FF FF FF FF }                         // width = 4294967295 (as 4-byte BE)
        $height_msg = { 7F FF FF FF }                        // height = 2147483647 (as 4-byte BE)
    condition:
        $png_magic at 0 and $ihdr_tag in (8..12) and
        ($width_msg in (16..19) and $height_msg in (20..23))
}

Suricata IDS Rule

alert http any any -> $HOME_NET any ( \
  msg:"CVE-2026-58552 Huawei Image Codec OOB Read Attempt"; \
  flow:to_server,established; \
  content:"POST"; http_method; \
  content:"Content-Type: multipart/form-data"; http_header; \
  pcre:"/filename=.*\.(png|jpg|jpeg|heic)/i"; \
  pcre:"/width=.{0,200}(FFFF|7FFF)/i"; \
  sid:1002585; rev:1; \
  metadata:cve CVE-2026-58552, attack_target IoT, deployment Perimeter; \
  reference:cve,CVE-2026-58552; \
  classtype:attempted-user; )

Elastic Detection

sequence by source.ip, destination.ip with maxspan=5m
  [ network where dns.question.name : "*huawei*" or http.request.body.content : "*.png*" ]
  [ http where http.request.method == "POST" and
      http.request.body.content : "*width=0x*" and
      http.request.body.content : "*height=0x*" ]
  [ http where http.response.status_code in (200, 201, 500) ]

Splunk SPL Query

index=web sourcetype=access_combined uri_path="/cgi-bin/upload.cgi" OR uri_path="/api/v1/image/upload"
  method=POST
  | regex _raw="(?i)(filename=.*\.(png|jpg|jpeg|heic))"
  | regex _raw="(?i)(width=.{0,200}(ffff|7fff))"
  | stats count by src_ip, dest_ip, user_agent, uri_path
  | where count > 1
  | table _time, src_ip, dest_ip, uri_path, user_agent, count

Wazuh OSSEC Rule

<rule id="100585" level="12">
  <decoded_as>web-access</decoded_as>
  <description>CVE-2026-58552: Possible Huawei image codec OOB read attempt detected</description>
  <group>cve-2026-58552, attack, exploitation,</group>
  <field name="method">POST</field>
  <regex>filename=.*\.(png|jpg|jpeg|heic)</regex>
  <regex>width=.{0,200}(ffff|7fff)</regex>
  <field name="url">/upload|/image</field>
  <if_sid>N/A</if_sid>
  <options>no_full_log</options>
  <mitre>
    <id>T1190</id>
  </mitre>
</rule>

Mitigation & Patch Guidance

Patch Confidence: 0/4 — UNPATCHED. No vendor advisory, patch, or updated firmware version has been published. Do not wait for a security fix before taking action.

1. Immediate Mitigations (while unpatched):

• Disable or restrict image upload functionality on Huawei devices, especially on management interfaces accessible from untrusted networks.
• If the upload endpoint cannot be disabled, restrict access via firewall rules to trusted management IPs only.
• For home gateway devices, disable remote management and UPnP if not required.
• Monitor logs for anomalous POST requests to image endpoints with extreme dimension values.

2. Patch/Upgrade Steps:

• Monitor Huawei's security advisory portal (https://www.huawei.com/en/psirt) and the vendor's support portal daily for new firmware releases.
• Subscribe to vendor security notifications for the specific product line in use.
• When a patch is released, stage it in a lab environment first to validate regression, then deploy during maintenance windows.

3. Long-Term Hardening:

• Segment IoT and edge devices into a separate VLAN with no direct internet exposure.
• Deploy a web application firewall (WAF) with a custom rule to block HTTP requests containing suspicious image dimension parameters.
• Implement file-upload validation at the application proxy layer, rejecting files with declared dimensions exceeding 100 megapixels.
• If possible, replace affected Huawei devices with alternative vendors for critical infrastructure, or isolate them from high-value data paths.
• Maintain an updated inventory of all Huawei devices and their firmware versions to prioritize patching once a fix lands.

References

• NVD Entry for CVE-2026-58552: https://nvd.nist.gov/vuln/detail/CVE-2026-58552 (includes CVSS 5.1 vector and description)
• Huawei PSIRT Security Advisories: https://www.huawei.com/en/psirt (monitor for future patch bulletin)
• CWE-125 Out-of-bounds Read Reference: https://cwe.mitre.org/data/definitions/125.html
• EPSS Data for CVE-2026-58552: https://www.first.org/epss/search?cve=CVE-2026-58552
• CISA Known Exploited Vulnerabilities Catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog (CVE not currently listed, recheck periodically)

As of this writing, no specific threat actor campaigns have been publicly attributed to this vulnerability, and there is no evidence of exploitation in the wild, consistent with the low EPSS percentile. However, the availability of public PoC code and the broad deployment of Huawei image codec modules across consumer and enterprise devices make this a credible, high-priority risk for confidentiality-focused environments.