{"answers":{"affected":"6 open source packages ship an affected version, including phpseclib/phpseclib. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40194 exists.","fix":"Upgrade phpseclib/phpseclib to a fixed version for your release line: 1.0.28, 2.0.53 or 3.0.51.","what":"CVE-2026-40194 is a low-severity vulnerability in phpseclib, published on 10 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-40194 and fix it if it is affected.\n\nWhat it is: CVE-2026-40194 is a low-severity vulnerability in phpseclib, published on 10 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40194 exists.\n\nAffected packages and fixed versions:\n- phpseclib/phpseclib (Packagist): affected from 0.1.1; fixed in 1.0.28\n- phpseclib/phpseclib (Packagist): affected from 0.1.1; fixed in 1.0.28\n- phpseclib/phpseclib (Packagist): affected from 2.0.0; fixed in 2.0.53\n- phpseclib/phpseclib (Packagist): affected from 2.0.0; fixed in 2.0.53\n- phpseclib/phpseclib (Packagist): affected from 3.0.0; fixed in 3.0.51\n- phpseclib/phpseclib (Packagist): affected from 3.0.0; fixed in 3.0.51\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-2026-40194/ (Markdown: https://insights.sbomify.com/CVE-2026-40194/index.md)","id":"CVE-2026-40194","markdown":"https://insights.sbomify.com/CVE-2026-40194/index.md","name":"CVE-2026-40194","record":{"aliases":["CLSA-2026-1779410885","DEBIAN-CVE-2026-40194","GHSA-r854-jrxh-36qx","UBUNTU-CVE-2026-40194"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"PHP SSH library","requires_auth":"none","summary":"An attacker can exploit a timing side-channel in SSH packet verification to potentially recover sensitive data or forge packets.","user_interaction":"not_required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"phpseclib","vendor":"phpseclib"}],"cvss":{"score":3.7,"severity":"low","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-208","name":"Observable Timing Discrepancy"}],"description":"phpseclib is a PHP secure communications library. Starting in 0.1.1 and prior to 3.0.51, 2.0.53, and 1.0.28, phpseclib\\Net\\SSH2::get_binary_packet() uses PHP's != operator to compare a received SSH packet HMAC against the locally computed HMAC. != on equal-length binary strings in PHP uses memcmp(), which short-circuits on the first differing byte. This is a real variable-time comparison (CWE-208), proven by scaling benchmarks. This vulnerability is fixed in 3.0.51, 2.0.53, and 1.0.28.","ecosystems":["Packagist"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"phpseclib has a variable-time HMAC comparison in SSH2::get_binary_packet() using != instead of hash_equals()","id":"CVE-2026-40194","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Packagist","product":null,"products":[],"type":"information_disclosure","year":"2026"},"n_packages":6,"n_references":5,"next":{"headline":"Incus nil-pointer dereference in storage bucket import allows denial of service","id":"CVE-2026-40195"},"packages":[{"ecosystem":"Packagist","fixed":["1.0.28"],"introduced":["0.1.1"],"last_affected":[],"package":"phpseclib/phpseclib","purl":null,"source":"GHSA-r854-jrxh-36qx"},{"ecosystem":"Packagist","fixed":["1.0.28"],"introduced":["0.1.1"],"last_affected":[],"package":"phpseclib/phpseclib","purl":"pkg:composer/phpseclib/phpseclib","source":"GHSA-r854-jrxh-36qx"},{"ecosystem":"Packagist","fixed":["2.0.53"],"introduced":["2.0.0"],"last_affected":[],"package":"phpseclib/phpseclib","purl":null,"source":"GHSA-r854-jrxh-36qx"},{"ecosystem":"Packagist","fixed":["2.0.53"],"introduced":["2.0.0"],"last_affected":[],"package":"phpseclib/phpseclib","purl":"pkg:composer/phpseclib/phpseclib","source":"GHSA-r854-jrxh-36qx"},{"ecosystem":"Packagist","fixed":["3.0.51"],"introduced":["3.0.0"],"last_affected":[],"package":"phpseclib/phpseclib","purl":null,"source":"GHSA-r854-jrxh-36qx"},{"ecosystem":"Packagist","fixed":["3.0.51"],"introduced":["3.0.0"],"last_affected":[],"package":"phpseclib/phpseclib","purl":"pkg:composer/phpseclib/phpseclib","source":"GHSA-r854-jrxh-36qx"}],"prev":{"headline":"Maddy Mail Server: LDAP Filter Injection via Unsanitized Username","id":"CVE-2026-40193"},"products":["phpseclib"],"published":"2026-04-10","related":[{"cvss_score":8.2,"headline":"phpseclib's AES-CBC unpadding susceptible to padding oracle timing attack","id":"CVE-2026-32935","kev_date_added":null,"published":"2026-03-20"},{"cvss_score":7.5,"headline":"Name confusion in x509 Subject Alternative Name fields","id":"CVE-2023-52892","kev_date_added":null,"published":"2024-06-27"},{"cvss_score":7.5,"headline":"Phpseclib needs guardrails on large binaryfield integers","id":"CVE-2023-49316","kev_date_added":null,"published":"2023-11-27"},{"cvss_score":7.5,"headline":"phpseclib Infinite Loop vulnerability","id":"CVE-2023-27560","kev_date_added":null,"published":"2023-03-03"},{"cvss_score":5.8,"headline":"phpseclib: X.509 certificate validation sends attacker-controlled outbound requests (server-side request forgery) via Authority Information Access","id":"CVE-2026-55599","kev_date_added":null,"published":"2026-06-22"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"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":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-05-08","vendors":["phpseclib"]},"summary":"An attacker can exploit a timing side-channel in SSH packet verification to potentially recover sensitive data or forge packets.","url":"https://insights.sbomify.com/CVE-2026-40194/"}