{"id":81972,"date":"2026-07-14T12:46:41","date_gmt":"2026-07-14T09:16:41","guid":{"rendered":"https:\/\/afaghhosting.net\/blog\/cve-2026-59246-zero-length-http-2-continuation-frames-bypass-mints-header-block-byte-size-cap-and-exhaust-client-memory\/"},"modified":"2026-07-14T12:46:41","modified_gmt":"2026-07-14T09:16:41","slug":"cve-2026-59246-zero-length-http-2-continuation-frames-bypass-mints-header-block-byte-size-cap-and-exhaust-client-memory","status":"publish","type":"post","link":"https:\/\/afaghhosting.net\/blog\/cve-2026-59246-zero-length-http-2-continuation-frames-bypass-mints-header-block-byte-size-cap-and-exhaust-client-memory\/","title":{"rendered":"CVE-2026-59246 &#8211; Zero-length HTTP\/2 CONTINUATION frames bypass Mint&#8217;s header-block byte-size cap and exhaust client memory"},"content":{"rendered":"<p>CVE ID :CVE-2026-59246<\/p>\n<p>  Published : July 14, 2026, 9:16 a.m. | 14\u00a0minutes ago<\/p>\n<p>  Description :Allocation of resources without limits vulnerability in elixir-mint mint allows a remote HTTP\/2 server to exhaust memory on the client host and cause a denial of service.<\/p>\n<p>The Mint.HTTP2.handle_continuation\/3 function in lib\/mint\/http2.ex accumulates the header-block fragment carried by each HTTP\/2 CONTINUATION frame into a growing conn.headers_being_processed nesting, one level deeper per frame, and only releases it when a frame with the END_HEADERS flag arrives. The only guard on this accumulator is Mint.HTTP2.assert_header_block_within_max_size\/2, which sums the byte size of the fragments received so far. Because a CONTINUATION frame is permitted by the protocol to carry a zero-length payload, an unbounded chain of zero-length CONTINUATION frames adds no bytes to the running total, never trips the size cap, and never emits END_HEADERS, yet each frame still nests the accumulator one level deeper.<\/p>\n<p>A malicious HTTP\/2 server (reachable directly, via an attacker-controlled redirect, via SSRF, or via a man-in-the-middle) can open a stream by sending a HEADERS frame without END_HEADERS and then stream zero-length CONTINUATION frames indefinitely. Client memory grows one cons cell per frame received; sustained bandwidth from the peer drives the BEAM node running the Mint client to memory exhaustion and eventual out-of-memory termination.<\/p>\n<p>This issue affects mint: from 0.1.0 before 1.9.2.<\/p>\n<p>  Severity: 6.3 | 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-2026-59246 Published : July 14, 2026, 9:16 a.m. | 14\u00a0minutes ago Description :Allocation of resources without limits vulnerability in elixir-mint mint allows a remote HTTP\/2 server to exhaust memory on the client host and cause a denial of service. The Mint.HTTP2.handle_continuation\/3 function in lib\/mint\/http2.ex accumulates the header-block fragment carried by each HTTP\/2 CONTINUATION &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-81972","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/81972","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=81972"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/81972\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=81972"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=81972"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=81972"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}