What is the CVSS score of CVE-2026-22026?

CVE-2026-22026 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.1%.

Which versions of Cryptolib are affected by CVE-2026-22026?

CVE-2026-22026 presents notable security risk rated CVSS 7.5. Exploitation could compromise the security of affected deployments.. A patch is available.

Is there a public PoC exploit available for CVE-2026-22026?

Yes, a public proof-of-concept exploit is available for CVE-2026-22026. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-22026?

Within 7 days: Identify all affected systems and apply vendor patches promptly. Vendor patch is available.

Cryptolib CVE-2026-22026

HIGH

Memory Allocation with Excessive Size Value (CWE-789)

2026-01-10 security-advisories@github.com

Buffer Overflow Cryptolib

7.5

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/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:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Jan 16, 2026 - 16:43 vuln.today

Public exploit code

Patch released

Jan 16, 2026 - 16:43 nvd

Patch available

CVE Published

Jan 10, 2026 - 01:16 nvd

HIGH 7.5

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 libcurl write_callback function in the KMC crypto service client allows unbounded memory growth by reallocating response buffers without any size limit or overflow check. A malicious KMC server can return arbitrarily large HTTP responses, forcing the client to allocate excessive memory until the process is terminated by the OS. This issue has been patched in version 1.4.3.

AnalysisAI

CryptoLib versions prior to 1.4.3 are vulnerable to denial of service through unbounded memory allocation in the KMC crypto service client's HTTP response handling. A malicious or compromised KMC server can trigger excessive memory consumption by sending arbitrarily large responses, causing the client process to crash. Public exploit code exists for this vulnerability affecting spacecraft communications secured by SDLS-EP.

Technical ContextAI

Affects the KMC crypto component of Cryptolib. 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 libcurl write_callback function in the KMC crypto service client allows unbounded memory growth by reallocating response buffers without any size limit or overflow check. A malicious KMC server can return arbitrarily large HTTP responses, fo