Vulnerability · Published Jan 10, 2026 · Assigned by GitHub_M

CVE-2026-22026CryptoLib Unbounded Memory Allocation in KMC HTTP Response Handler Allows Resource Exhaustion

High 8.2

In plain English

A high-severity security flaw in CryptoLib from nasa. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities).

Severity (CVSS 4.0)8.2High

Exploit odds (30 days)0.6%top 49.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
nasa	CryptoLib	< 1.4.3

Weakness: CWE-789 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

https://github.com/nasa/CryptoLib/security/advisories/GHSA-w9cm-q69w-34x7 x_refsource_CONFIRM
https://github.com/nasa/CryptoLib/commit/2372efd3da1ccb226b4297222e25f41ecc84821d x_refsource_MISC
https://github.com/nasa/CryptoLib/releases/tag/v1.4.3 x_refsource_MISC