CVE-2026-56810
DoS via unbounded memory growth in Mint.HTTP1 chunked decoding.
Is CVE-2026-56810 being exploited?
Not confirmed. CVE-2026-56810 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.52% probability of exploitation in the next 30 days.
How severe is CVE-2026-56810?
CVE-2026-56810 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-56810?
Yes. A fix has been recorded for CVE-2026-56810. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-56810 affect?
CVE-2026-56810 affects Mint.HTTP1 (Elixir Mint) 0.5.0 - 1.9.0. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-56810?
Upgrade Mint to 1.9.1+
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated remote server can trigger unbounded memory growth in Mint.HTTP1, causing OOM/crash.
Patch when possible
- affected>= 0.5.0 and < 1.9.1
- affected>= c575d819d39ebf7e9b77ec24584a5ffbb11c844e and < 193ce714907d16e8adc4ab3c40e4f0c2f045b2a6
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.