Security readout for executives and security teams
Plain-English summary
CVE-2026-21898 affects NASA CryptoLib before 1.4.3, a library used to secure spacecraft-to-ground communications. A malformed AOS frame hash can make the software read outside valid memory. The main business concern is service disruption in specialized space communications environments; limited data exposure is also possible.
Executive priority
Prioritize remediation where CryptoLib protects operational spacecraft or ground-station links. The vulnerability is high severity and remotely triggerable by CVSS, but available sources do not show active exploitation.
Technical view
Crypto_AOS_ProcessSecurity in CryptoLib before 1.4.3 lacks valid bounds checking when parsing AOS frame hashes, causing an out-of-bounds read (CWE-125). The CVSS 3.1 score is 8.2: network reachable, low complexity, no privileges or user interaction, with low confidentiality and high availability impact.
Likely exposure
Exposure is likely limited to organizations using NASA CryptoLib versions earlier than 1.4.3 in cFS, SDLS-EP, spacecraft, simulator, or ground-station communication stacks.
Exploitation context
The provided sources do not report active exploitation, and this CVE is not marked KEV. The CVSS vector indicates remote unauthenticated attack potential if an affected deployment processes attacker-controlled AOS frames.
Researcher notes
Evidence is limited to the CVE record, GitHub advisory, and v1.4.3 release reference. Do not assume broader affected products beyond NASA CryptoLib <1.4.3. Focus validation on dependency versioning and whether AOS frame hash parsing is reachable.
Mitigation direction
- Upgrade NASA CryptoLib to version 1.4.3 or later.
- Inventory spacecraft, ground-station, lab, and simulator systems using CryptoLib.
- Review the GitHub security advisory and release notes for vendor guidance.
- Prioritize exposed or mission-critical AOS processing paths first.
Validation and detection
- Confirm deployed CryptoLib versions are 1.4.3 or later.
- Check dependency manifests, embedded builds, and mission software baselines.
- Verify affected AOS frame processing components were rebuilt after upgrade.
- Monitor vendor advisory updates for additional remediation details.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-125: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-21898 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H3.94.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.2HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/nasa/CryptoLib/security/advisories/GHSA-7ch6-2pmg-m853CVE reference · x_refsource_CONFIRM
- https://github.com/nasa/CryptoLib/releases/tag/v1.4.3CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.