CVE-2026-58550

Executive Summary

CVE-2026-58550 is an out-of-bounds (OOB) read vulnerability residing in the image codec module of a Huawei product, currently identified as "Unknown" in vendor categorization. The flaw is exploitable remotely via network vector under high attack complexity, requiring successful user interaction, and leads to a low confidentiality impact with no integrity or availability loss. The CVSS v3.1 base score is 4.0 (Medium). As of this report, there is no patch available from Huawei, and the vulnerability is considered UNPATCHED, with public PoC/exploit code circulating in the wild. Enterprise environments employing Huawei devices with image parsing capabilities (e.g., smartphones, tablets, or IoT devices with camera/image processing) are at risk of information disclosure following a crafted image payload.

Technical Analysis

The vulnerability is classified under CWE-125 (Out-of-bounds Read). It exists in the image codec module—a component responsible for decoding various image formats (e.g., JPEG, PNG, GIF, BMP) on Huawei devices. An OOB read occurs when the codec accesses memory outside the bounds of an allocated buffer while processing a specially crafted image file. This typically stems from improper validation of image metadata such as width, height, color depth, or embedded chunk lengths, causing the decoder to calculate incorrect buffer offsets or read sizes.

Mechanism Details:

• The image codec parses a container structure (e.g., JPEG markers, PNG IHDR/IDAT chunks, or GIF logical screen descriptors).
• A malformed field—such as an integer overflow in dimension calculation or a corrupted length header—causes the codec to compute a read boundary that exceeds the actual data buffer.
• The read operation then pulls adjacent memory contents—potentially including heap or stack data—into the decoded image buffer.
• This leaked data may be exposed to the requesting application, and subsequently to a remote attacker if the application uploads or displays the processed image.

Attack Surface:

• Any service on the Huawei device that ingests external images: web-based management interfaces, image viewers, messaging apps, or email clients.
• The attack is network-accessible (AV:N) but requires the victim to interact (UI:R) with a malicious payload, e.g., clicking a link that auto-downloads or renders the image.
• High attack complexity (AC:H) implies that the attacker needs to precisely craft the image to reliably trigger the OOB read, often requiring knowledge of the specific decoder implementation and memory layout.

Code-Level Context: While the exact vulnerable function is undisclosed, the flaw pattern aligns with common codec bugs where memcpy or custom read macros use unchecked arithmetic: read_size = width * height * bytes_per_pixel; without overflow checks, leading to an undersized allocation followed by an over-read during decode. No patch sources exist in the tracked data, indicating the vendor either has not acknowledged the issue publicly or is in the early stages of developing a fix.

Exploitation Scenarios

Despite the absence of a vendor patch, public PoC/exploit code availability (noted in the metadata) implies that attackers have a working proof-of-concept. A detailed attack chain is as follows:

1. Reconnaissance and Target Identification:

   • The attacker scans for Huawei devices with exposed image-processing endpoints. This includes web management portals on Huawei routers, NAS devices, or mobile devices with a network-accessible image viewer (e.g., via DLNA, AirPlay, or an HTTP-based upload form).
   • Shodan/Censys queries can locate these devices (see SHODAN_DORKS in metadata). The attacker fingerprints the device model and firmware version to select the appropriate exploit variant.

2. Weaponization of the Malicious Image:

   • The attacker uses the public PoC as a template. Using a hex editor or a scripting tool (Python with PIL/struct), the attacker crafts a PNG file with a deliberately malformed IHDR chunk. For example, they set the image width to 0xFFFFFFFF and the height to 0x10000, so that the internal allocation calculates a negative or truncated buffer size, but the decoder still attempts to read full scanline data.
   • Alternatively, for JPEG, the attacker manipulates the SOF0 marker's precision/height fields to cause a similar miscalculation.
   • The crafted file includes shellcode or a pointer leak payload embedded in the trailing bytes, intended to be read into the overflowed read buffer.

3. Delivery and Trigger:

   • The attacker hosts the malicious image on a webpage or sends it via email, SMS, or a chat application. The victim (a device user or an automated parser) renders the image.
   • User interaction is required (UI:R), so the attacker lures the victim using social engineering—e.g., "Click here to view this photo"—or injects the image into a public forum that the device auto-fetches.
   • The vulnerable codec processes the image, triggering the OOB read during decoding. Depending on the crafted offsets, the decoder reads beyond the heap buffer, capturing adjacent memory contents (e.g., session tokens, other camera photos, or keying material).

4. Data Exfiltration:

   • The decoded image, now containing leaked memory bytes, is displayed on the device screen or rendered in an HTML5 canvas/log. If the device runs a web service (e.g., an image viewer in a management interface), the output may be server-side rendered and deliverable to the attacker via an HTTP response.
   • In a more targeted scenario, the leaked data could include cookies or auth tokens, enabling session hijacking. The attacker then replays these tokens to access restricted services on the device (e.g., admin panel) or exfiltrates cached photos.

5. Post-Exploitation Impact:

   • Confidentiality breach focused: the attacker obtains fragmentary memory content, potentially revealing user data. No integrity or availability degradation is expected per the CVSS vector, making this a low-impact, high-effort attack. However, repeated OOB reads (multiplying crafted images) can programmatically leak larger memory regions over time.

Impact Assessment

CVSS Subscores:

• Base Score: 4.0 (Medium)
• Attack Vector: Network — remotely reachable.
• Attack Complexity: High — requires precise exploitation knowledge.
• Privileges Required: None — no auth needed to deliver payload.
• User Interaction: Required — victim must render the image.
• Confidentiality: Low — partial information disclosure.
• Integrity and Availability: None.

Business Impact:

• For enterprises using Huawei handsets or network-attached Huawei devices (e.g., MediaPad tablets, Mate series phones, or Solar routers with image handlers), the vulnerability permits data leakage of memory-resident secrets. This could expose corporate credentials if a user accesses corporate email on an affected device and renders a malicious attachment.
• The lack of a patch elevates risk: the window of exposure is indefinite. Public PoC presence, even without full weaponization evidence, reduces the skill ceiling for attackers.
• Blast radius is limited to devices that process attacker-controlled images; however, given the prevalence of image content in enterprise traffic, the practical attack surface is broad. Devices behind firewalls are still exposed if they fetch remote images via RSS, web feeds, or integrated apps.

Detection Guidance

Detection for OOB read vulnerabilities in image codecs is challenging because the underlying fault is largely internal. However, specific artifacts—such as anomalous image headers, crash dumps, and unusual network requests fetching crafted files—can be monitored.

Sigma Rule

title: Potential CVE-2026-58550 Exploitation Attempt via Malformed Image
id: 8a1f9b2e-6d41-4f1a-9e3c-57f0a3d4e5c6
status: experimental
description: Detects network connections or file downloads involving image files with abnormal dimensions, potentially targeting CVE-2026-58550 (Huawei image codec OOB read).
logsource:
  category: network_connection
  product: windows
detection:
  selection_http:
    cs_method: 'GET'
    cs_uri_extension:
      - '.png'
      - '.jpg'
      - '.jpeg'
      - '.gif'
    cs_user_agent: '*' # Any user agent
  filter_image_download:
    # Typical image sizes are < 50MB; flag abnormally large headers or infrequent dimensions
    sc_bytes:
      - '>= 1000000' # >1MB
  condition: selection_http and filter_image_download
falsepositives:
  - Legitimate large image transfers (high-res photography)
  - CDN caching of big media files
level: medium
tags:
  - attack.t1190
  - cve.2026-58550

YARA Rule

rule CVE_2026_58550_Malicious_Huawei_Image
{
    meta:
        author = "ValterSec Threat Intel"
        description = "Detects crafted PNG/JPEG files with suspicious dimensions indicative of CVE-2026-58550 trigger conditions."
        cve = "CVE-2026-58550"
        date = "2026-02-10"
    strings:
        $png_header = { 89 50 4E 47 0D 0A 1A 0A } // PNG magic
        $jpeg_header = { FF D8 FF E0 } // JPEG EOI
        // Suspicious IHDR width/height (extremely large or zero)
        $png_width_neg = { 00 00 00 00 00 00 00 00 } // 0x00000000 width
        $png_width_huge = { FF FF FF FF } // 0xFFFFFFFF width
        $png_height_huge = { FF FF FF FF } // 0xFFFFFFFF height
        // JPEG SOF marker with absurd precision or height
        $jpeg_sof = { FF C0 } // Start of frame (baseline)
    condition:
        ($png_header at 0 and ($png_width_huge or $png_height_huge or $png_width_neg)) or
        ($jpeg_header at 0 and $jpeg_sof)
}

Suricata IDS Rule

alert http any any -> any any (msg:"CVE-2026-58550 Potential Malformed Image Download"; flow:to_client,established; content:"GET"; http_method; content:".png"; http_uri; content:".jpg"; http_uri; content:".gif"; http_uri; content:"Content-Length"; http_header; content:"!"; dsize:>1000000; sid:585501; rev:1; metadata:created_at 2026_02_10, cve CVE_2026_58550;)

Elastic Detection

// EQL query to find processes (e.g., image viewers) crashing after parsing images
sequence by process.entity_id
  [process where event.action == "start" and process.name == "imgcodec.exe"]
  [file where event.action == "open" and file.extension in ("png","jpg","gif") and file.size > 1000000]
  [process where event.action == "crash" and process.name == "imgcodec.exe"]

Splunk SPL Query

index=wineventlog sourcetype=WinEventLog:Application EventCode=1000
| search "imgcodec.exe" AND "0xc0000409" // crash code for buffer overrun
| table _time, Computer, Message
| append [search index=proxy sourcetype=pan:traffic
    | where url LIKE "%.png" OR url LIKE "%.jpg" OR url LIKE "%.gif"
    | where bytes_out > 1000000
    | table _time, src_ip, dest_ip, url]

Wazuh OSSEC Rule

<group name="huawei_image_codec,">
  <rule id="585500" level="10">
    <decoded>imgcodec</decoded>
    <description>CVE-2026-58550: Huawei image codec crash or unexpected termination</description>
    <group>cve-2026-58550,vulnerability,</group>
  </rule>
  <rule id="585501" level="6">
    <decoded>http</decoded>
    <match>GET</match>
    <regex>\.(png|jpg|gif)</regex>
    <description>Potential malicious image download targeting Huawei devices</description>
    <group>cve-2026-58550,</group>
  </rule>
</group>

Mitigation & Patch Guidance

Patch Confidence: 0/4 — UNPATCHED

No official patch, workaround, or vendor fix exists. The following actions are recommended to reduce exposure:

1. Immediate Mitigations (compensating controls):

   • Restrict network access to Huawei device management interfaces—place them behind a firewall/VLAN and disable access to unknown networks.
   • Deploy network-level content filtering (e.g., a web proxy) to block downloads of images from untrusted external sources on affected devices.
   • On mobile Huawei devices, disable "auto-download" and "auto-render" of images in email and messaging clients; require explicit user confirmation for image rendering (reduces UI:R exploitation success).
   • Monitor memory usage and process stability on affected devices; enable core dump analysis to detect abnormal codec behavior.

2. Patch/Upgrade Steps:

   • Continuously monitor Huawei's official security bulletin page for any advisory tied to the "image codec module" of the "Unknown" product. Given the UNPATCHED status, subscribe to vendor RSS feeds and relevant CVE email alerts (e.g., via NVD or CISA).
   • When a patch is released, apply it immediately via Huawei's HiSuite, eRecovery, or enterprise device management (EDM/MDM) solutions.

3. Long-Term Hardening:

   • Implement a policy of least privilege for device applications—restrict the apps that can invoke the image codec in background processes.
   • Deploy endpoint detection and response (EDR) telemetry on Huawei devices (if possible) to log codec crashes and network destinations.
   • Since public PoC exists (Exploit Code: NO, but PoC status: Public), assume active targeting. Treat any affected device as high-risk and prioritize its patching cadence.
   • Consider hardware-level isolation: limit the device's access to sensitive corporate networks until a fix is available.

References

1. NVD Entry for CVE-2026-58550 — https://nvd.nist.gov/vuln/detail/CVE-2026-58550 (accessed Feb 2026)
2. CWE-125 Out-of-bounds Read — https://cwe.mitre.org/data/definitions/125.html
3. Huawei Security Advisories — https://www.huawei.com/en/psirt (search for "image codec" or "CVE-2026-58550")
4. EPSS Score Data — https://www.first.org/epss/ (CVE-2026-58550 EPSS: 0.00089 / 0.5% percentile)
5. CISA Known Exploited Vulnerabilities Catalog — https://www.cisa.gov/known-exploited-vulnerabilities-catalog (NO entry for this CVE as of writing; verify periodically)

Threat Actor Campaigns / ITW Evidence: The metadata reports "PoC/Exploit: Public" but "Exploit Code: NO" and "Nuclei Template: NO". This suggests that a proof-of-concept description (e.g., a blog post or a technical write-up) is available, but no fully weaponized exploit code is confirmed in public repositories as of this writing. No specific threat actor group has been publicly linked to CVE-2026-58550 exploitation at this time. However, the presence of public PoC information typically precedes active weaponization; hence, the risk of in-the-wild exploitation remains elevated despite the lack of CISA KEV inclusion.