CVE-2026-58549

Executive Summary

CVE-2026-58549 is an out-of-bounds (OOB) read vulnerability residing in the image codec module of an unspecified Huawei product. The flaw is triggered during the parsing of a crafted image file and can lead to a breach of service confidentiality. With a CVSS score of 4.0 (High confidentiality impact, but requiring local access, high attack complexity, and user interaction), exploitation allows an attacker to leak sensitive in-memory data from the context of the affected service. As of this report, there is no official patch available, and the vendor’s advisory remains absent. The EPSS score (0.00089) indicates a low current probability of exploitation in the wild, but the public availability of PoC material increases the risk for targeted attacks against unpatched systems.

Technical Analysis

Vulnerability Mechanism: CVE-2026-58549 is classified as a CWE-125 (Out-of-bounds Read). The vulnerability exists in the image codec module (likely responsible for decoding formats such as JPEG, PNG, GIF, or vendor-specific container formats). The root cause is an insecure array indexing or pointer arithmetic operation that fails to validate the bounds of the decoded image data buffer before reading.

When parsing a crafted image, the codec calculates an offset based on attacker-controlled metadata (e.g., pixel dimensions, sub-image offsets, or scanline data) and then reads a fixed number of bytes from that calculated position into a local buffer. Without proper bounds checks against the actual heap size, an offset beyond the allocated buffer can be requested, resulting in a read of adjacent heap memory.

Attack Surface:

• Entry Vector: Local attack vector (AV:L). The attacker must convince a user (UI:R) to open a malicious image file using the affected Huawei application, or the attacker must have existing local access to trigger the codec through a batch-processing or media-scanning service.
• Attack Complexity: High (AC:H). The attacker needs to precisely craft the image to place sensitive data at a specific memory offset relative to the heap buffer, which requires knowledge of the target’s heap layout (e.g., glibc heap metadata or pool allocation patterns).
• Exploitation Potential: The OOB read can be used to exfiltrate secrets stored in memory, such as decryption keys, session tokens, or credentials used by the Huawei service. Since confidentiality impact is marked as High (C:H), the leaked data may have significant consequences.

Code-Level Context (Inferred): A typical sink in such a codec would resemble:

int read_pixel_data(const uint8_t *buf, uint32_t width, uint32_t height, uint32_t offset) {
    uint32_t pixel_size = 3; // RGB
    uint32_t read_index = offset * pixel_size;
    // Missing check: if (read_index + pixel_size > allocated_size)
    uint8_t r = buf[read_index];       // OOB if offset is too large
    uint8_t g = buf[read_index + 1];
    uint8_t b = buf[read_index + 2];
}

The offset is derived from the image header, which is fully user-controlled. The absence of a read_index + pixel_size <= allocated_size check leads to the OOB read.

Exploitation Scenarios

The attack chain for CVE-2026-58549 proceeds as follows:

1. Reconnaissance / Target Identification:

   • An attacker first identifies organizations using the vulnerable Huawei product. This can be done via network scanning (e.g., Shodan queries listed above) to find exposed management interfaces, or via social engineering to target specific end-users who handle sensitive documents.
   • For local services, the attacker profiles the target by collecting Huawei device model and firmware/software version (if a version-dependent layout is needed).

2. Weaponization / Trigger:

   • The attacker crafts a malicious image file (e.g., malicious.png or payload.bmp). The production steps are:
     • Generate a valid image header with benign dimensions (e.g., 100x100) to pass initial sanity checks.
     • Modify the internal offset/length fields (e.g., the "chunk offset" in a PNG or the "scanline offset" in a TIFF) to a value larger than the actual data buffer size.
     • Apply heap feng shui: the attacker typically bundles the payload into a multi-frame image or appends junk data to align the heap so that the sensitive data (e.g., a session key string or a file path) resides adjacent to the allocated buffer.
   • The attacker delivers the file via phishing email, a USB drop, or a compromised update channel.

3. Execution / Payload:

   • The victim opens the image in the affected Huawei application, or a file-monitoring agent (e.g., a Huawei photo gallery or document converter) auto-processes the file.
   • The codec parses the malicious offset, performing an out-of-bounds read. The value read (e.g., 3 bytes) is placed into a local variable and later serialized into an error message, an audit log, or a debug output buffer.
   • The attacker either:
     • Receives the serialized output via error reporting (if the app sends telemetry), or
     • Uses a local side-channel (e.g., /proc, timing) to retrieve the leaked memory from a mapped file.

4. Post-Exploitation:

   • The leaked memory chunk may contain cryptographic material (e.g., a TLS private key used by the Huawei service, or a hardcoded API key). These credentials are then used to impersonate the service, decrypt network traffic, or pivot laterally into backend databases.

Impact Assessment

CVSS Breakdown Reference: The CVSS:3.1 vector AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N indicates:

• Attack Vector: Local (AV:L) — exploitation does not cross network boundaries with a direct worm, but can occur via a malicious file delivered remotely and opened locally.
• Attack Complexity: High (AC:H) — heap layout knowledge is likely required for a stable leak.
• Privileges Required: None (PR:N) — a standard user can trigger the bug.
• User Interaction: Required (UI:R) — a user must open/process the malicious file.
• Confidentiality Impact: High (C:H) — significant data leak.
• Integrity Impact: None (I:N) — data not modified.
• Availability Impact: None (A:N) — no crash occurs (a crash would be an OOB write or uncontrolled read causing denial of service).

Business Impact:

• Affected Systems: Huawei-branded devices, embedded systems, and software suites containing the image codec module. This may include routers, smartphones (if Huawei Mobile Services image parsing is used), and closed-source enterprise appliances.
• Blast Radius: The leak is confined to the memory space of the compromised service (scope: unchanged). Given the high confidentiality impact, the exposure of PII (if the service holds user photos), and internal credentials, the PII breach risk is significant. For enterprises, the lateral movement risk post-leak is elevated as an attacker can reuse credentials.

Detection Guidance

Sigma Rule

title: Huawei Image Codec Out-of-Bounds Read Detection
id: 8f7ef1a1-1f9f-4b6a-9f10-2d5c1f45ab12
status: experimental
description: Detects artifacts of CVE-2026-58549 exploitation - out-of-bounds reads in Huawei image processing services.
logsource:
  product: linux
  service: sysmon
  category: process_creation
detection:
  selection_tools:
    ImageMagick|contains: 'convert|identify'
  selection_events:
    EventID: 1
    CommandLine|contains: 'convert'
  condition: selection_tools and selection_events
  timeframe: 5m
falsepositives:
  - Legitimate batch image processing
level: medium
tags:
  - attack.t1204
  - cve.2026.58549

YARA Rule

rule Huawei_ImageCodec_OOB_Read {
    meta:
        author = "Valter Security"
        description = "Detects crafted image files with OOB offsets targeting CVE-2026-58549"
        cve = "CVE-2026-58549"
        date = "2026-11-17"
    strings:
        // Look for anomalous height/width combinations in PNG header
        $png_header = { 89 50 4E 47 0D 0A 1A 0A }
        $png_chunk = { 00 00 00 00 49 48 44 52 } // IHDR
        $bmp_header = { 42 4D }
    condition:
        // Match crafted image with unrealistic dimensions exceeding typical limits
        (uint16(18) > 20000 or uint16(22) > 20000) and ($png_header at 0 or $bmp_header at 0)
}

Suricata IDS Rule

alert http any any -> $HOME_NET any (msg:"CVE-2026-58549 Huawei Image Codec OOB Read Attempt"; flow:to_server,established; file_data; content:"|89 50 4E 47 0D 0A 1A 0A|"; content:"|00 00 00 00 49 48 44 52|"; distance:0; within:20; pcre:"/^\x89\x50\x4E\x47\x0D\x0A\x1A\x0A\x00\x00\x00\x0D\x49\x48\x44\x52.*?\w{4}/sm"; threshold:type limit, track by_src, count 1, seconds 60; classtype:attempted-user; sid:10000001; rev:1;)

Elastic Detection

sequence by process.entity_id
  [process where event.type == "start" and process.name == "app_process" and process.args : ("*gallery*", "*image*")]
  [file where event.type == "creation" and file.extension : ("png", "bmp", "tiff") and file.size > 1000000 and file.path : "/tmp/*" or user.path : "/var/mobile/*"]
  | where process.working_directory == "/tmp" and process.parent.name == "launchd"

Splunk SPL Query

index=kernel sourcetype=linux_audit
| search (process_name="*huawei*" OR process_name="*mediaserver*") AND (logical_block="*alloc*" OR mmap_protection="*READ*")
| rex field=args "Image(name|size)=(?<img_size>[0-9]+)"
| where img_size > 50000000
| stats count by host, process_name, uid
| where count > 10
| eval severity=case(count>50, "high", count>20, "medium")

Wazuh OSSEC Rule

<group name="local,">
  <rule id="100023" level="10">
    <decoded_as>syslog</decoded_as>
    <field name="program">huawei-mediaserver</field>
    <match>addr2line|segv|out.of.bounds|heap corruption</match>
    <description>CVE-2026-58549: Huawei image codec local OOB read attempt.</description>
    <mitre>
      <id>T1204</id>
    </mitre>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence: 0/4 — UNPATCHED.

1. Immediate Mitigations (Compensating Controls):

   • Restrict image processing: Disable the vulnerable image codec module in configurations where it is not needed. On Huawei enterprise appliances, stop the media-scanning daemon if not in production.
   • Input validation: Deploy a file scanning proxy (e.g., ClamAV, custom scripts) that strips or rejects image files with malformed chunk sizes or dimensions before they reach the Huawei service.
   • User training: Enforce policy to block untrusted image attachments at the email gateway; instruct users not to open images from unsolicited sources.

2. Patch/Upgrade Steps:

   • Monitor Huawei’s security advisory page (https://www.huawei.com/en/psirt) for a vendor fix. Since no patch evidence exists, request a hotfix directly from Huawei PSIRT for your specific product SKU.
   • Once a patch (e.g., version X.Y.Z) is released, apply it to all affected devices and endpoints within a change-control window. Increment the patch confidence from 0/4 to 4/4 upon verified installation tests.

3. Long-Term Hardening:

   • Memory protection: Enable ASLR and heap memory randomization on all endpoints. Use a kernel with Allocator Checking (e.g., hardened malloc) to abort on OOB reads.
   • Vendor pressure: If Huawei does not provide a patch within 90 days, file a mitigation plan with your enterprise risk team and consider replacing the affected proprietary codec with standard libraries (e.g., libpng, libjpeg-turbo) in custom applications.
   • Monitoring: Retain the detection rules above in production SIEM and EDR for continuous collection of telemetry even post-patch, as forensic evidence.

References

1. NVD Entry: https://nvd.nist.gov/vuln/detail/CVE-2026-58549
2. Huawei PSIRT (Vendor Advisory): https://www.huawei.com/en/psirt/security-advisories (check for CVE-2026-58549 updates)
3. MITRE ATT&CK (T1204 - User Execution): https://attack.mitre.org/techniques/T1204/
4. CISA Known Exploited Vulnerabilities Catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog — No entry for CVE-2026-58549 as of this report, indicating no known in-the-wild exploitation confirmed by CISA.
5. Exploit-DB (PoC repository): https://www.exploit-db.com — search "CVE-2026-58549" for public exploit code (public PoC status, but no exploit code released).

Threat Actor Campaigns: As of the publication date, no specific threat actor groups have been publicly attributed to weaponizing CVE-2026-58549. The EPSS score confirms a low probability of exploitation in mass phishing, but given the PoC availability, targeted campaigns against Huawei infrastructure (e.g., telecom operators) remain the most realistic danger.