CVE-2026-22023: CryptoLib Buffer Overflow Vulnerability

CVE-2026-22023 Overview

CVE-2026-22023 is an out-of-bounds heap read vulnerability affecting CryptoLib, a software-only solution implementing the CCSDS Space Data Link Security Protocol - Extended Procedures (SDLS-EP) used to secure communications between spacecraft running the core Flight System (cFS) and ground stations. The vulnerability exists in the cryptography_aead_encrypt() function in versions prior to 1.4.3.

Critical Impact

An attacker exploiting this out-of-bounds heap read vulnerability could cause denial of service conditions affecting spacecraft-to-ground-station communications, potentially disrupting critical space mission operations.

Affected Products

• CryptoLib versions prior to 1.4.3
• Systems implementing CCSDS SDLS-EP using vulnerable CryptoLib versions
• NASA core Flight System (cFS) deployments using affected CryptoLib versions

Discovery Timeline

• 2026-01-10 - CVE CVE-2026-22023 published to NVD
• 2026-01-13 - Last updated in NVD database

Technical Details for CVE-2026-22023

Vulnerability Analysis

This vulnerability is classified as CWE-125 (Out-of-Bounds Read), which occurs when a program reads data past the end or before the beginning of an intended buffer. In the context of CryptoLib, the flaw exists within the cryptography_aead_encrypt() function, which handles authenticated encryption with associated data (AEAD) operations for space communications.

The out-of-bounds heap read can be triggered through network-accessible attack vectors, though some preconditions must be met for successful exploitation. When triggered, the vulnerability primarily impacts availability by causing unexpected program behavior or crashes, disrupting the secure communication channel between spacecraft and ground stations.

Root Cause

The root cause stems from improper bounds checking within the cryptography_aead_encrypt() function when processing input data. The function fails to properly validate buffer boundaries before performing heap memory read operations, allowing memory access beyond allocated buffer limits. This type of memory safety issue is particularly critical in cryptographic code paths where precise memory handling is essential for both security and stability.

Attack Vector

The vulnerability is exploitable via network access, requiring no privileges or user interaction but with some attack complexity prerequisites. An attacker could craft malicious input that triggers the out-of-bounds read condition in the AEAD encryption routine. While the primary impact is denial of service through availability disruption, out-of-bounds read vulnerabilities can sometimes lead to information disclosure if the read data is subsequently transmitted or logged.

The patch addresses CCSDS compliance in the AAD (Additional Authenticated Data) construction process:

  * @param aad: uint8_t*
  * @return status: uint32_t
  *
- * CCSDS Compliance: CCSDS 355.0-B-2 Section 7.2.3 (AAD Construction)
+ * CCSDS Compliance: CCSDS 355.0-B-2 Section 4.2.3 (AAD Construction)
  **/
 uint32_t Crypto_Prepare_AOS_AAD(const uint8_t *buffer, uint16_t len_aad, const uint8_t *abm_buffer, uint8_t *aad)
 {

Source: GitHub Commit Update

Detection Methods for CVE-2026-22023

Indicators of Compromise

• Unexpected crashes or service interruptions in CryptoLib-dependent communication processes
• Abnormal memory access patterns or segmentation faults in cryptography_aead_encrypt() function calls
• Unusual network traffic patterns targeting SDLS-EP encrypted communication channels
• Application crash dumps indicating heap memory violations in crypto operations

Detection Strategies

• Monitor system logs for segmentation faults or memory access violations in CryptoLib components
• Implement runtime memory safety tools (AddressSanitizer, Valgrind) in development and testing environments to detect out-of-bounds access
• Deploy intrusion detection signatures for anomalous traffic patterns targeting spacecraft communication protocols
• Conduct regular vulnerability scanning to identify unpatched CryptoLib versions in deployment environments

Monitoring Recommendations

• Enable verbose logging for cryptographic operations to capture potential exploitation attempts
• Monitor process stability metrics for services utilizing CryptoLib encryption functions
• Implement alerting for unexpected service restarts or crashes in SDLS-EP communication components
• Track memory utilization anomalies in processes handling AEAD encryption operations

How to Mitigate CVE-2026-22023

Immediate Actions Required

• Upgrade CryptoLib to version 1.4.3 or later immediately to address this vulnerability
• Audit all systems using CryptoLib to identify vulnerable deployments
• Review network access controls to limit exposure of systems running vulnerable CryptoLib versions
• Implement monitoring for exploitation attempts while patches are being deployed

Patch Information

NASA has released CryptoLib version 1.4.3 which addresses this out-of-bounds heap read vulnerability. The fix is available through the official GitHub Release v1.4.3. Additional technical details about the vulnerability and remediation can be found in the GitHub Security Advisory GHSA-8w3h-q8jm-3chq.

Workarounds

• Restrict network access to systems running vulnerable CryptoLib versions using firewall rules and network segmentation
• Implement additional input validation layers before data reaches CryptoLib encryption functions
• Consider temporary isolation of affected communication systems until patching is completed
• Enable memory protection mechanisms (ASLR, stack canaries) to reduce exploitation impact

# Configuration example
# Verify current CryptoLib version and upgrade to patched release
cd /path/to/CryptoLib
git fetch --tags
git checkout v1.4.3
mkdir build && cd build
cmake .. && make
make install
# Verify installation
./crypto_test --version