CVE-2026-58971 in Android
Summary
by MITRE • 11/02/2026
In _mupdf_get_hdr of wprint_mupdf.c, there is a possible out-of-bounds read due to an integer overflow. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.
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Analysis
by VulDB Data Team • 11/02/2026
The vulnerability identified in the _mupdf_get_hdr function within wprint_mupdf.c represents a critical security flaw rooted in improper handling of arithmetic operations during data parsing. Specifically, an integer overflow occurs when calculating buffer sizes or offsets based on input values derived from untrusted sources. This type of error typically arises when signed integers are used for calculations that can exceed the maximum representable value, causing the result to wrap around to a negative number or a significantly smaller positive number than intended. In the context of memory allocation and array indexing, such miscalculations lead directly to out-of-bounds read conditions where the application attempts to access memory locations outside the bounds of the allocated buffer. This flaw is categorized under CWE-190 Integer Overflow or Wraparound which serves as the root cause for subsequent memory safety violations like CWE-125 Out-of-Bounds Read.
From an operational perspective, this vulnerability allows for local information disclosure without requiring any additional execution privileges from the attacker. The absence of a requirement for user interaction significantly lowers the barrier to exploitation, enabling automated attacks against systems running affected versions of the software. An adversary can craft malicious input that triggers the integer overflow during header parsing, causing the application to read sensitive data from adjacent memory regions. This disclosed information may include stack contents, heap metadata, or other process-specific details that are not intended for public access. Such leaks provide attackers with valuable intelligence about the target environment, potentially facilitating further exploitation steps such as bypassing security mitigations like Address Space Layout Randomization by revealing base addresses of loaded libraries.
The impact extends beyond simple data leakage as out-of-bounds reads can destabilize application behavior and expose cryptographic keys or authentication tokens stored in memory. Since the vulnerability exists within a component likely involved in processing print-related documents, attackers could target users who open specific malformed files through automated means such as email attachments or web downloads if integrated into a browser context. The lack of user interaction requirement implies that background processes or scheduled tasks handling these inputs are equally susceptible to exploitation. This characteristic makes the vulnerability particularly dangerous in enterprise environments where automated document processing pipelines might inadvertently trigger the flaw without any direct human involvement.
Mitigation strategies must address both the immediate code defect and broader architectural weaknesses associated with integer arithmetic safety. Developers should implement rigorous input validation checks before performing any calculations involving user-supplied data to ensure that values remain within expected ranges. Utilizing safe integer libraries or compiler flags such as -ftrapv can help detect overflow conditions at runtime during development phases. Additionally, adopting memory-safe programming practices and static analysis tools capable of identifying CWE-190 patterns will reduce the likelihood of similar defects in future releases. For deployed systems, applying vendor-provided patches is essential to resolve this issue immediately. Organizations should also consider deploying intrusion detection signatures that monitor for anomalous memory access patterns indicative of exploitation attempts related to out-of-bounds reads mapped under ATT&CK technique T1083 File and Directory Discovery or potentially T1564 Hidden Files and Directories if the leaked data aids in stealthier operations.