{"id":"CVE-2026-42044","aliases":["GHSA-3w6x-2g7m-8v23"],"url":"https://o3.security/vulnerability/CVE-2026-42044","summary":"Axios: Invisible JSON Response Tampering via Prototype Pollution Gadget in `parseReviver`","details":"Axios is a promise based HTTP client for the browser and Node.js. From 1.0.0 to before 1.15.2, he Axios library is vulnerable to a Prototype Pollution \"Gadget\" attack that allows any Object.prototype pollution in the application's dependency tree to be escalated into surgical, invisible modification of all JSON API responses — including privilege escalation, balance manipulation, and authorization bypass. The default transformResponse function at lib/defaults/index.js:124 calls JSON.parse(data, this.parseReviver), where this is the merged config object. Because parseReviver is not present in Axios defaults, not validated by assertOptions, and not subject to any constraints, a polluted Object.prototype.parseReviver function is called for every key-value pair in every JSON response, allowing the attacker to selectively modify individual values while leaving the rest of the response intact. This vulnerability is fixed in 1.15.2.","published":"2026-04-24T17:49:49.517Z","modified":"2026-08-07T11:51:09.384279677Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"axios","fixedVersion":"1.15.2"}],"fix":null,"references":[{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42044.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:16532"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:16534"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:16535"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:16542"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:17657"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:17699"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:19109"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:19375"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:20338"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:20454"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:20889"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:20938"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:21017"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:21338"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:21772"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:22465"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:22629"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:22840"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:23361"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24471"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24473"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24536"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24539"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24853"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:25041"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:25089"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:25271"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:25273"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:26214"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:26225"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:26232"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:33574"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34608"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36107"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36882"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:41066"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:42078"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:50300"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-42044"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42044.json"},{"type":"ADVISORY","url":"https://github.com/axios/axios/security/advisories/GHSA-3w6x-2g7m-8v23"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42044"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2461624"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:51:09.384279677Z"}}