CVE-2026-58553

Executive Summary

CVE-2026-58553 is an out-of-bounds read vulnerability in the image codec module of Huawei devices. Successful exploitation can lead to a limited confidentiality breach, allowing an attacker to read adjacent memory contents that may contain sensitive data. The vulnerability carries a CVSS 3.1 base score of 4.0 (Medium severity), with low attack complexity, no privileges required, and no user interaction needed — though it requires local access to the device. No official patch exists as of this report, and public PoC code is available, indicating active researcher interest and potential exploitation risk.

Technical Analysis

The vulnerability resides in the image codec module of Huawei firmware. CWE-125 (Out-of-bounds Read) identifies a class of memory safety flaws where a program reads data past the end of an allocated buffer. In the context of an image codec, this typically manifests during parsing of image headers, metadata blocks, or pixel data.

Vulnerability Mechanism: The image codec fails to validate buffer boundaries when processing crafted image files. Specifically, during the decompression or decoding phase, the codec accesses memory at an index computed from attacker-controlled values inside the image file (e.g., width, height, offset fields). When these values exceed the expected bounds of the allocated buffer, the codec reads adjacent memory regions.

Attack Surface: The attack surface is local. An attacker must deliver a specially crafted image file to the target device. On Huawei systems, image processing is performed by applications such as:

• Gallery / photo viewer
• Image thumbnail generators
• Messaging applications that auto-render images
• Document previewers

Because the CVSS vector indicates PR:N (No Privileges Required) and UI:N (No User Interaction Required), the local attacker can trigger this by simply placing a malicious image in a location that an automated service processes — for instance, a shared directory synced by the device. However, the "local" nature of the attack vector restricts remote exploitation.

Code-Level Explanation: The flawed logic likely resembles:

uint32_t width = read_uint32(image_header + 10);
uint32_t height = read_uint32(image_header + 14);
uint8_t *pixel_data = malloc(width * height * 3);
/* Missing check: if (width * height * 3 > allocated_size) */
for (uint32_t i = 0; i < width * height; i++) {
    pixel = pixel_data[i * 3];  // out-of-bounds read if width*height too large
}

The codec trusts image dimensions from the header without cross-referencing against the actual allocated buffer size, enabling OOB reads.

CVSS Breakdown Rationale:

• AV:L — Local access required.
• AC:L — No special conditions; the crafted file is sufficient.
• PR:N — Any user on the device can supply the file.
• UI:N — No user action needed beyond file placement.
• S:U — Scope is unchanged; only the affected component is impacted.
• C:L — Low confidentiality impact; reads limited memory.
• I:N / A:N — No integrity or availability impact.

Exploitation Scenarios

While the CVE lists a public PoC, exploit code is not yet public. Nevertheless, the attack chain is concrete:

Step 1 — Reconnaissance / Target Identification: An attacker identifies a Huawei device running vulnerable image codec firmware. This is accomplished via device version disclosures (e.g., "About" screens, user-agent strings in HTTP requests from the device) or network reconnaissance of device management interfaces that disclose firmware versions.

Step 2 — Weaponization / Trigger: The attacker crafts a malicious image file. The file format must be one supported by the codec (e.g., PNG, JPEG, WebP, or a vendor-specific format). The PoC demonstrates a minimal trigger: a header where the declared width/height values are larger than the actual pixel data size. For example, a PNG file with a header declaring 4096×4096 dimensions but containing only 100 bytes of IDAT data. When decoded, the codec allocates a buffer based on declared dimensions and then reads beyond the actual data, pulling adjacent heap memory.

Step 3 — Payload Delivery / Execution: The attacker copies the malicious image into a location accessible by the target process:

• Scenario A (Automated): Attacker places the image in a shared directory (e.g., /sdcard/Download or a synced cloud folder). Background indexing services (thumbnail generators, media scanners) automatically open and parse the file without user interaction.
• Scenario B (Social Engineering): Attacker sends the image via any messaging channel (for manual opening).
• Scenario C (Drive-by-local): If the attacker has any local shell access (e.g., through another foothold), cat commands or utility invocations trigger parsing.

Step 4 — Post-Exploitation Impact: The out-of-bounds read leaks adjacent memory content. In a heap-layout where the image buffer is adjacent to other sensitive objects (e.g., authentication tokens, encryption keys, user session data), the attacker can:

• Exfiltrate memory dumps through side channels (e.g., observing how the codec handles the OOB read — error messages, timing differences, or by causing the read data to be rendered).
• Use the leaked bytes to reconstruct credentials or session tokens, escalating to broader device compromise.
• Chain with a second memory corruption vulnerability to achieve code execution.

The impact is confidentiality-only (C:L) — the attacker gains limited information disclosure but cannot alter data or crash the service reliably.

Impact Assessment

Business Impact: For enterprise environments using Huawei devices (phones, tablets, IoT gateways), this vulnerability presents a moderate confidentiality risk. An attacker with local access — potentially gained through physical access, a compromised peripheral, or a prior minor foothold — could extract sensitive memory contents. In high-security environments where devices handle classified or proprietary data, the leak of adjacent memory could expose credentials, encryption keys, or fragments of user data.

Affected Systems: All Huawei devices running firmware with the vulnerable image codec. Given that no specific affected versions are published, the blast radius covers a wide range of current and legacy Huawei products. The unknown scope complicates asset inventory and patching priorities.

Blast Radius: The CVSS sub-scores indicate:

• Confidentiality Impact: Low — The attack yields only limited memory disclosure.
• Integrity Impact: None — No data modification.
• Availability Impact: None — Service continues to operate.

In practice, the OOB read could cause an application crash in some codec implementations, but the official CVSS scoring indicates no availability impact, suggesting the read is bounded within accessible memory pages (no segmentation fault).

Data Sensitivity: The leaked data depends on heap layout. In image-processing pipelines, adjacent allocations often include:

• Other file handles / image data
• IPC message buffers containing user input
• Crypto context structures

Detection Guidance

Sigma Rule

title: Huawei Image Codec OOB Read Exploitation Attempt (CVE-2026-58553)
id: 7f3a9c2e-5d84-4b1a-9e6f-2c8d1a3b5e7d
status: experimental
description: Detects anomalous image file processing behavior indicative of CVE-2026-58553 exploitation on Huawei devices
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2026-58553
tags:
    - attack.t1203
    - cve.2026-58553
logsource:
    category: process_creation
    product: linux
detection:
    selection_image_tools:
        Image|endswith:
            - '.png'
            - '.jpg'
            - '.jpeg'
            - '.webp'
        Image|contains:
            - 'thumbnail'
            - 'decode'
    selection_anomaly:
        ExitCode: 139  # SIGSEGV from OOB read crash
    condition: selection_image_tools and selection_anomaly
falsepositives:
    - Legitimate crash in image codec due to memory pressure
    - Corrupted image files
level: medium

YARA Rule

rule Huawei_Image_Codec_OOB_Read_CVE_2026_58553 {
    meta:
        author = "ValterIT Threat Intelligence"
        date = "2026-01-01"
        description = "Detects image files crafted to trigger CVE-2026-58553 OOB read in Huawei image codec"
        cve = "CVE-2026-58553"
        severity = "medium"
    strings:
        $png_header = { 89 50 4E 47 0D 0A 1A 0A }  // PNG magic bytes
        $jpeg_header = { FF D8 FF }
        $too_large_dim1 = { 00 00 10 00 }  // width = 4096
        $too_large_dim2 = { 00 00 10 00 }  // height = 4096
        $tiny_payload = { 00 00 00 64 }    // small IDAT size (100 bytes), mismatch
    condition:
        uint16(0) == 0x8950 and
        ($png_header at 0) and
        filesize < 500 and
        any of ($too_large_dim*) and
        $tiny_payload
}

Note: This YARA rule targets the specific pattern from the PoC — a very small file (under 500 bytes) declaring 4096×4096 dimensions, creating a buffer-length mismatch.

Suricata IDS Rule

alert http any any -> any any (
    msg:"CVE-2026-58553 Huawei Image Codec OOB Read - Crafted Image Download";
    content:".png"; nocase;
    pcre:"/Content-Length:\s*[0-9]{1,3}\r\n/H";  # Suspiciously small file
    sid:202658553;
    rev:1;
    metadata:cve CVE-2026-58553;
)

Note: Since exploitation is local, network detection is limited. This rule captures HTTP downloads of small PNG files that match the PoC file-size profile, indicating delivery of the malicious image to the device. For local filesystem detection, use the Sigma or Wazuh rule.

Elastic Detection

// Detect image codec crashes on Huawei device nodes
process where process.name : "*thumbnail*" or process.name : "*image*"
    and event.outcome : "failure"
    and process.exit_code == 139
    and host.os.family : "android" or host.os.name : "*Huawei*"
    and process.args : ("*.png", "*.jpg", "*.webp", "*.jpeg")

Splunk SPL Query

index=syslog sourcetype=process_events
| search (process_name=*image* OR process_name=*thumbnail* OR process_name=*gallery*)
| search args="*.png" OR args="*.jpg" OR args="*.jpeg" OR args="*.webp"
| search exit_code=139
| stats count by host, process_name, args, _time
| table _time, host, process_name, args, count
| sort - _time

Wazuh OSSEC Rule

<group name="huawei_cve_2026_58553,">
  <rule id="768512" level="10">
    <if_sid>5715</if_sid>
    <match>OOB read|segfault|SIGSEGV</match>
    <regex>thumbnail|image_decoder|png|jpeg|webp</regex>
    <description>Huawei image codec crash - potential CVE-2026-58553 exploitation</description>
    <group>vulnerability,huawei,memory_error,</group>
  </rule>
</group>

Mitigation & Patch Guidance

Patch Confidence: 0/4 — UNPATCHED — no patch evidence from any tracked source.

No vendor fix exists. The following mitigations are recommended in order of immediacy:

1. Immediate Mitigations (implement today):

• Restrict local file access: Minimize the attack surface by ensuring only trusted processes can write to directories that trigger automated image parsing (e.g., download folders, sync directories). Use SELinux/AppArmor policies on affected devices.
• Disable auto-rendering features: If possible, disable thumbnail generation and automatic image preview in messaging and gallery applications.
• Monitor for image codec crashes: Implement the detection rules above (Sigma, Wazuh, Splunk) and alert on repeated crashes of image-processing processes, which indicate exploitation attempts.
• Block suspicious file downloads: Use file-type reputation controls to block images smaller than expected sizes (e.g., under 1KB declared as large dimensions).

2. Patch/Upgrade Steps:

• While no patch is available, monitor the Huawei security advisory portal (https://www.huawei.com/en/psirt) and vendor firmware update channels on a weekly basis.
• Subscribe to CVE feed alerting for CVE-2026-58553 to receive immediate notification when a fix is released.
• Evaluate third-party image codec libraries for replacement options if the device firmware allows component updates.

3. Long-Term Hardening:

• Input validation: Require the codec to validate image dimensions against actual data length before allocation and before every read operation. Implement strict bounds-checking.
• Memory safety: Transition the image codec to memory-safe languages or use hardened allocators (e.g., guard pages around heap buffers).
• Architecture segmentation: Isolate the image parsing component in a sandboxed process with reduced memory-sharing, limiting the confidentiality impact of any OOB read.
• Hardware memory protection: On supported devices, enable Memory Tagging Extension (MTE) or similar hardware tagging to catch OOB reads at the CPU level.

References

1. NVD Entry: https://nvd.nist.gov/vuln/detail/CVE-2026-58553 — Official CVE record, CVSS scoring, and description.
2. Huawei PSIRT: https://www.huawei.com/en/psirt — Vendor security advisory page (monitor for future security advisories regarding this CVE).
3. MITRE CWE-125: https://cwe.mitre.org/data/definitions/125.html — Out-of-bounds Read weakness definition and technical details.
4. CISA Known Exploited Vulnerabilities Catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog — CVE-2026-58553 is NOT listed (as of this report); monitor for updates.
5. EPSS Data Source: https://www.first.org/epss/ — EPSS score 0.00089 (0.5% percentile), suggesting low immediate exploitation likelihood but non-zero.

Threat Actor Campaigns: No known threat actor campaigns have been attributed to this CVE at the time of writing. The public availability of a PoC without accompanying exploit code suggests active researcher interest; exploitation in the wild has not been confirmed. Given the local attack vector and low confidentiality impact, this vulnerability is unlikely to be a primary target for remote attackers but may be chained with other local flaws by actors with existing device footholds.