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Cryptolib CVE-2026-21898

HIGH
Out-of-bounds Read (CWE-125)
2026-01-10 security-advisories@github.com
Buffer Overflow Information Disclosure Cryptolib
8.2
CVSS 3.1 · GitHub Advisory
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GitHub Advisory PRIMARY
8.2 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
PoC Detected
Jan 15, 2026 - 21:48 vuln.today
Public exploit code
CVE Published
Jan 10, 2026 - 01:16 nvd
HIGH 8.2

DescriptionGitHub Advisory

CryptoLib provides a software-only solution using the CCSDS Space Data Link Security Protocol - Extended Procedures (SDLS-EP) to secure communications between a spacecraft running the core Flight System (cFS) and a ground station. Prior to version 1.4.3, the Crypto_AOS_ProcessSecurity function reads memory without valid bounds checking when parsing AOS frame hashes. This issue has been patched in version 1.4.3.

AnalysisAI

CryptoLib versions prior to 1.4.3 contain an out-of-bounds read vulnerability in the Crypto_AOS_ProcessSecurity function that allows remote attackers to crash spacecraft communications systems when parsing malformed AOS frame hashes. Public exploit code exists for this vulnerability affecting cFS deployments that rely on SDLS-EP for spacecraft-to-ground station security. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Send malformed AOS frame to spacecraft
Exploit
Parser reads unbounded memory in hash field
Impact
Information disclosure and denial of service triggered
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Vulnerability AssessmentAI

Exploitation CryptoLib versions prior to 1.4.3 with SDLS-EP protocol enabled on spacecraft cFS receiving AOS frames from ground station. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 8.2 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker could exploit this vulnerability to compromise the affected system.
Remediation Fixed in version 1.4.3.. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 7 days: Identify all affected systems and apply vendor patches promptly. …

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CVE-2026-21898 vulnerability details – vuln.today
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