CVE-2025-0838
📋 TL;DR
This CVE describes a heap buffer overflow vulnerability in Abseil-cpp's hash containers where oversized size arguments can cause integer overflow and out-of-bounds memory writes. Any application using vulnerable versions of Abseil-cpp is affected, potentially allowing attackers to execute arbitrary code or crash applications. The vulnerability affects both flat and node hash sets/maps in the Abseil library.
💻 Affected Systems
- Abseil-cpp
- Any software that includes vulnerable Abseil-cpp versions
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Application crashes (denial of service) or memory corruption leading to unpredictable behavior.
If Mitigated
Controlled crashes with minimal data loss if proper memory protections are enabled.
🎯 Exploit Status
Exploitation requires control over size arguments passed to vulnerable methods, which may be attacker-controlled in some applications.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Commit 5a0e2cb5e3958dd90bb8569a2766622cb74d90c1 or later
Vendor Advisory: https://github.com/abseil/abseil-cpp/commit/5a0e2cb5e3958dd90bb8569a2766622cb74d90c1
Restart Required: Yes
Instructions:
1. Update Abseil-cpp to commit 5a0e2cb5e3958dd90bb8569a2766622cb74d90c1 or later. 2. Rebuild any applications that link against Abseil-cpp. 3. Restart affected services.
🔧 Temporary Workarounds
Input validation wrapper
allAdd input validation to check size arguments before passing to vulnerable methods
// C++ code example: if (size > MAX_SAFE_SIZE) throw std::invalid_argument("Size too large");
🧯 If You Can't Patch
- Implement strict input validation for all size arguments passed to Abseil hash containers
- Enable ASLR and other memory protection mechanisms to reduce exploit reliability
🔍 How to Verify
Check if Vulnerable:
Check Abseil-cpp version or commit hash in your build system. Vulnerable if before commit 5a0e2cb5e3958dd90bb8569a2766622cb74d90c1.Check Version:
git log --oneline | head -1 # For source builds, or check package manager for installed versionVerify Fix Applied:
Verify Abseil-cpp is at commit 5a0e2cb5e3958dd90bb8569a2766622cb74d90c1 or later, and rebuilt applications are using the updated library.📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults
- Memory corruption errors in application logs
- Unexpected process termination
Network Indicators:
- Unusual network traffic patterns to/from affected services
- Increased error responses from web services
SIEM Query:
source="application.logs" AND ("segmentation fault" OR "SIGSEGV" OR "heap corruption")