{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-21899 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-21899 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-21899 is a medium-severity vulnerability in nasa CryptoLib, published on 10 Jan 2026. An attacker needs administrator access to exploit it, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-21899 and fix it if it is affected.\n\nWhat it is: CVE-2026-21899 is a medium-severity vulnerability in nasa CryptoLib, published on 10 Jan 2026. An attacker needs administrator access to exploit it, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-21899 in the wild and no public exploit code.\n\nAffected product: nasa CryptoLib. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-21899/ (Markdown: https://insights.sbomify.com/CVE-2026-21899/index.md)","id":"CVE-2026-21899","markdown":"https://insights.sbomify.com/CVE-2026-21899/index.md","name":"CVE-2026-21899","record":{"aliases":["GHSA-wc29-5hw7-mpj8"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Space Data Link Security Library","requires_auth":"high_privilege","summary":"An attacker can cause a denial of service by sending an empty Base64url string, triggering a null pointer dereference or out-of-bounds read in CryptoLib.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"cryptolib","vendor":"nasa"}],"cvss":{"score":4.7,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L","version":"3.1"},"cwes":[{"id":"CWE-125","name":"Out-of-bounds Read"}],"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, in base64urlDecode, padding-stripping dereferences input[inputLen - 1] before checking that inputLen \u003e 0 or that input != NULL. For inputLen == 0, this becomes an OOB read at input[-1], potentially crashing the process. If input == NULL and inputLen == 0, it dereferences NULL - 1. This issue has been patched in version 1.4.3.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"CryptoLib has an out-of-bounds read and crash vulnerability when decoding an empty Base64url string","id":"CVE-2026-21899","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"null_dereference","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"CryptoLib Has Out-of-Bounds Read in KMC Encrypt Metadata Parsing via Flawed strtok Pattern","id":"CVE-2026-21900"},"packages":[],"prev":{"headline":"CryptoLib Has Out-of-bounds Read in Crypto_AOS_ProcessSecurity","id":"CVE-2026-21898"},"products":["CryptoLib"],"published":"2026-01-10","related":[{"cvss_score":9.4,"headline":"CryptoLib Has Heap Overflow in Crypto_TM_ProcessSecurity due to Unchecked Secondary Header Length","id":"CVE-2025-30216","kev_date_added":null,"published":"2025-03-25"},{"cvss_score":9.3,"headline":"Heap Buffer Overflow via Incomplete Length Check in `Crypto_TC_ApplySecurity`","id":"CVE-2025-30356","kev_date_added":null,"published":"2025-04-01"},{"cvss_score":8.9,"headline":"CryptoLib's Crypto_TC_ApplySecurity() Has a Heap Buffer Overflow Vulnerability","id":"CVE-2025-29909","kev_date_added":null,"published":"2025-03-17"},{"cvss_score":8.9,"headline":"CryptoLib Has Heap Buffer Overflow in Crypto_AOS_ProcessSecurity Function","id":"CVE-2025-29911","kev_date_added":null,"published":"2025-03-17"},{"cvss_score":8.9,"headline":"CryptoLib Has Heap Buffer Overflow Due to Unsigned Integer Underflow in Crypto_TC_ProcessSecurity","id":"CVE-2025-29912","kev_date_added":null,"published":"2025-03-17"},{"cvss_score":8.9,"headline":"CryptoLib's Crypto_TC_Prep_AAD Has Buffer Overflow Due to Integer Underflow","id":"CVE-2025-29913","kev_date_added":null,"published":"2025-03-17"},{"cvss_score":8.8,"headline":"CryptoLib vulnerable to Stack Buffer Overflow in Crypto_Key_Update due to missing TLV length check","id":"CVE-2025-64096","kev_date_added":null,"published":"2025-10-30"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-01-12","vendors":["nasa"]},"summary":"An attacker can cause a denial of service by sending an empty Base64url string, triggering a null pointer dereference or out-of-bounds read in CryptoLib.","url":"https://insights.sbomify.com/CVE-2026-21899/"}