{"id":82143,"date":"2026-07-17T14:47:14","date_gmt":"2026-07-17T11:17:14","guid":{"rendered":"https:\/\/afaghhosting.net\/blog\/cve-2026-59695-unbounded-max_fee_per_gas-in-mpp-tempo-fee-payer-enables-single-request-wallet-drain\/"},"modified":"2026-07-17T14:47:14","modified_gmt":"2026-07-17T11:17:14","slug":"cve-2026-59695-unbounded-max_fee_per_gas-in-mpp-tempo-fee-payer-enables-single-request-wallet-drain","status":"publish","type":"post","link":"https:\/\/afaghhosting.net\/blog\/cve-2026-59695-unbounded-max_fee_per_gas-in-mpp-tempo-fee-payer-enables-single-request-wallet-drain\/","title":{"rendered":"CVE-2026-59695 &#8211; Unbounded max_fee_per_gas in mpp Tempo fee-payer enables single-request wallet drain"},"content":{"rendered":"<p>CVE ID :CVE-2026-59695<\/p>\n<p>  Published : July 17, 2026, 11:17 a.m. | 20\u00a0minutes ago<\/p>\n<p>  Description :Improper Validation of Specified Quantity in Input in ZenHive mpp allows an unauthenticated remote client to drain the fee-payer wallet in a single request by naming an arbitrarily high gas price.<\/p>\n<p>When the mpp Elixir library is configured as fee payer (fee_payer: true), MPP.Tempo.Transaction.cosign_fee_payer\/3 re-signs the client-supplied base fields of the 0x76 AASigned envelope verbatim, including max_fee_per_gas and max_priority_fee_per_gas, without validating that they are within reasonable bounds. A malicious client embeds arbitrarily large values for these fields in the signed envelope. The server co-signs and broadcasts the transaction. The effective_gas_price billed against the fee-payer wallet is derived from the attacker-supplied ceilings, so the server pays those inflated per-gas rates out of its own wallet. A single crafted request can drain the wallet entirely, after which the server can no longer sponsor gas for legitimate payment requests.<\/p>\n<p>This issue affects mpp: from 0.2.0 before 0.6.0.<\/p>\n<p>  Severity: 8.3 | HIGH<\/p>\n<p>  Visit the link for more details, such as CVSS details, affected products, timeline, and more&#8230;\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>CVE ID :CVE-2026-59695 Published : July 17, 2026, 11:17 a.m. | 20\u00a0minutes ago Description :Improper Validation of Specified Quantity in Input in ZenHive mpp allows an unauthenticated remote client to drain the fee-payer wallet in a single request by naming an arbitrarily high gas price. When the mpp Elixir library is configured as fee payer &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-82143","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/82143","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=82143"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/82143\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=82143"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=82143"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=82143"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}