CVE-2026-73270
Case-insensitive path bypass in Erlang/OTP inets httpd allows unauthenticated file access.
Is CVE-2026-73270 being exploited?
Not confirmed. CVE-2026-73270 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 0.66% probability of exploitation in the next 30 days.
How severe is CVE-2026-73270?
CVE-2026-73270 is rated High. 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-2026-73270?
Yes. A fix has been recorded for CVE-2026-73270. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-73270 affect?
CVE-2026-73270 affects Erlang/OTP >=17.0 and <27.3.4.17, Erlang/OTP >=28.0 and <28.5.0.6, Erlang/OTP >=29.0 and <29.0.6, inets versions before fixes (see advisory). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-73270?
Upgrade Erlang/OTP/inets to the fixed versions or apply vendor patches immediately.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated remote disclosure: attackers can read files inside mod_auth-protected dirs by requesting paths with different casing on case-insensitive filesystems.
Patch when possible
- affected< 17.0
- affected>= 17.0 and < 27.3.4.17
- affected>= 28.0 and < 28.5.0.6
- affected>= 29.0 and < 29.0.6
- affected< 5.10
- affected>= 5.10 and < 9.3.2.7
- affected>= 9.4 and < 9.6.2.3
- affected>= 9.7 and < 9.7.2
- affected>= 84adefa331c4159d432d22840663c38f155cd4c1 and < *
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.