CVE-2025-60887: Cista Information Disclosure Vulnerability

CVE-2025-60887 Overview

CVE-2025-60887 is an insecure deserialization vulnerability discovered in Cista, a high-performance C++ serialization library. The vulnerability affects Cista v0.15 and below, where insecure deserialization of untrusted input under certain conditions may lead to leaking of stack/heap addresses which may be used to bypass Address Space Layout Randomization (ASLR). Classes with pointer-like mechanics under the cista::raw namespace are prone to reference tampering, where Cista does not perform sufficient checks to safeguard against self-referencing pointers and referencing other data within the payload.

Critical Impact
Successful exploitation allows attackers to leak memory addresses, potentially bypassing ASLR protections and enabling further exploitation chains such as code execution attacks.

Affected Products

Cista v0.15 and below
Applications utilizing cista::raw namespace classes for deserialization
Systems processing untrusted serialized data through Cista

Discovery Timeline

2026-04-28 - CVE CVE-2025-60887 published to NVD
2026-04-28 - Last updated in NVD database

Technical Details for CVE-2025-60887

Vulnerability Analysis

This insecure deserialization vulnerability (CWE-502) exists due to insufficient validation of pointer-like structures during the deserialization process in Cista. When applications deserialize untrusted input using classes within the cista::raw namespace, the library fails to adequately verify pointer references before processing them.

The vulnerability manifests when an attacker crafts malicious serialized payloads containing self-referencing pointers or references to other data within the payload itself. Since Cista does not implement proper bounds checking or validation for these pointer structures, the deserialization process can be manipulated to expose internal memory addresses.

The information disclosure occurs specifically when the deserialized values are observable by the attacker—for example, when application logic returns or logs the deserialized data structures. This leaked memory information (stack and heap addresses) can then be leveraged to calculate base addresses and defeat ASLR, a critical security mitigation present in modern operating systems.

Root Cause

The root cause of CVE-2025-60887 lies in the insufficient security checks within Cista's cista::raw namespace classes during deserialization operations. The library trusts incoming pointer references without validating whether they point to legitimate memory regions or whether they constitute malicious self-references. This lack of pointer validation allows attackers to craft payloads that manipulate the deserialization process to expose internal memory layout information.

Attack Vector

The attack is network-accessible, requiring no privileges or user interaction. An attacker can exploit this vulnerability by:

Crafting a malicious serialized payload containing manipulated pointer-like structures
Sending the payload to an application that deserializes untrusted input using Cista's cista::raw classes
Observing the deserialized output to extract leaked stack or heap addresses
Using the leaked addresses to calculate memory layout and bypass ASLR protections

The vulnerability mechanism involves reference tampering within serialized data structures. Attackers can create self-referencing pointers or cross-references within the payload that, when deserialized, expose memory addresses from the application's stack or heap. For detailed technical analysis and proof-of-concept code, refer to the GitHub Gist PoC.

Detection Methods for CVE-2025-60887

Indicators of Compromise

Unusual or malformed serialized data being processed by applications using Cista
Application logs showing unexpected memory address values in deserialized output
Network traffic containing crafted payloads targeting Cista deserialization endpoints
Abnormal application behavior following deserialization of external data

Detection Strategies

Implement input validation and integrity checks on all serialized data before deserialization
Monitor application logs for unusual pointer values or memory addresses in output
Deploy network intrusion detection rules to identify malformed serialization payloads
Use application-level logging to track deserialization operations on untrusted input

Monitoring Recommendations

Enable verbose logging for all deserialization operations involving external data
Monitor for applications using vulnerable Cista versions (v0.15 and below) in your environment
Implement anomaly detection for unexpected data patterns in deserialization workflows
Track and alert on any exposed memory addresses in application outputs or logs

How to Mitigate CVE-2025-60887

Immediate Actions Required

Audit all applications using Cista library for deserialization of untrusted input
Restrict or disable deserialization of external data until patches are applied
Implement strict input validation on all data processed through Cista's cista::raw namespace
Isolate affected applications from direct network exposure where possible

Patch Information

Organizations should monitor the Cista project for security updates addressing this vulnerability. Until an official patch is released, consider implementing the workarounds listed below. Upgrade to versions newer than v0.15 once a fixed release becomes available.

Workarounds

Avoid using cista::raw namespace classes for deserializing untrusted external input
Implement application-level validation to verify serialized data integrity before processing
Add runtime checks to detect and reject self-referencing or suspicious pointer structures
Consider using alternative serialization libraries for processing untrusted data
Implement additional memory protection mechanisms to limit information disclosure impact

Application developers should implement input validation before deserialization operations. Ensure that serialized data originates from trusted sources and implement cryptographic integrity checks (such as HMAC signatures) to verify data authenticity before processing with Cista.