{"id":80985,"date":"2026-06-24T03:19:44","date_gmt":"2026-06-23T23:49:44","guid":{"rendered":"https:\/\/afaghhosting.net\/blog\/cve-2026-6458-aes-256-gcm-authentication-tag-does-not-cover-first-ciphertext-blocks-when-aad-is-empty\/"},"modified":"2026-06-24T03:19:44","modified_gmt":"2026-06-23T23:49:44","slug":"cve-2026-6458-aes-256-gcm-authentication-tag-does-not-cover-first-ciphertext-blocks-when-aad-is-empty","status":"publish","type":"post","link":"https:\/\/afaghhosting.net\/blog\/cve-2026-6458-aes-256-gcm-authentication-tag-does-not-cover-first-ciphertext-blocks-when-aad-is-empty\/","title":{"rendered":"CVE-2026-6458 &#8211; AES-256-GCM Authentication Tag Does Not Cover First Ciphertext Blocks When AAD Is Empty"},"content":{"rendered":"<p>CVE ID :CVE-2026-6458<\/p>\n<p>  Published : June 23, 2026, 11:49 p.m. | 1\u00a0hour, 54\u00a0minutes ago<\/p>\n<p>  Description :Missing cryptographic step in Caliptra Core Firmware (aes_256_gcm_update module) results in an incorrect GCM authentication tag. When the streaming AES-256-GCM API is used with empty AAD, the hardware GHASH accumulator state is not saved after the first update call, causing the final tag to exclude the first batch of processed ciphertext. Ciphertext produced by that call may be modified without the tag reflecting the change.<\/p>\n<p>This issue affects Core Runtime Firmware: from 2.0.0 through 2.0.1, 2.1.0.<\/p>\n<p>  Severity: 5.1 | MEDIUM<\/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-2026-6458 Published : June 23, 2026, 11:49 p.m. | 1\u00a0hour, 54\u00a0minutes ago Description :Missing cryptographic step in Caliptra Core Firmware (aes_256_gcm_update module) results in an incorrect GCM authentication tag. When the streaming AES-256-GCM API is used with empty AAD, the hardware GHASH accumulator state is not saved after the first update call, causing &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-80985","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/80985","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=80985"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/80985\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=80985"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=80985"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=80985"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}