CVE-2026-49755
Memory exhaustion via decompression bombs in Req HTTP processing (Elixir).
Is CVE-2026-49755 being exploited?
Not confirmed. CVE-2026-49755 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 0.60% probability of exploitation in the next 30 days.
How severe is CVE-2026-49755?
CVE-2026-49755 is rated High with a CVSS score of 8.2. 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-2026-49755?
Yes. A fix has been recorded for CVE-2026-49755. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-49755 affect?
CVE-2026-49755 affects Req library (Elixir) <0.6.1. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-49755?
Upgrade to Req >=0.6.1
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unbounded decompression of attacker-controlled HTTP responses can exhaust memory and crash the BEAM VM.
Patch when possible
- affected>= 0.1.0 and < 0.6.1
- affected>= e37753741cbdc725e6aba3d977b380163bfc0ecb and < 84977e5b1a83f26e749d55ad06e3625464af4e8d
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.