PT-2026-55925 · Mint · Mint

Andrea Leopardi + 2 · Published 2026-07-06 · Updated 2026-07-06 · CVE-2026-56810

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions mint versions 0.5.0 through 1.9.0

Description A denial of service issue exists in the Mint.HTTP1 module. When decoding a chunked HTTP response body, the software accumulates partial fragments in the data buffer (an unbounded iolist) using the add body to buffer/2 function and does not emit data until the full declared chunk length is received. Because the chunk size is parsed from the server without an upper bound, a malicious server can specify an enormous chunk size and send bytes slowly. This forces the client to buffer data indefinitely, potentially leading to an out-of-memory condition. This can be triggered when a client follows redirects, fetches user-supplied URLs, or processes webhooks. The issue is associated with the decode body/5 function in the lib/mint/http1.ex file.

Recommendations Update mint to version 1.9.1 or later.

Exploit

Fix

Allocation of Resources Without Limits

Weakness Enumeration

CWE-770

Related Identifiers

CVE-2026-56810

GHSA-C59H-FQ4P-R36R

Affected Products

Mint

References · 6

• 🔥 https://github.com/elixir-mint/mint/security/advisories/GHSA-c59h-fq4p-r36r · Exploit
• https://github.com/elixir-mint/mint/commit/193ce714907d16e8adc4ab3c40e4f0c2f045b2a6 · Patch
• https://osv.dev/vulnerability/EEF-CVE-2026-56810 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-56810 · Security Note
• https://hex.pm/packages/mint · Note
• https://cna.erlef.org/cves/CVE-2026-56810.html · Note