CVE-2026-73270
published 2026-09-01CVE-2026-73270: Improper Handling of Case Sensitivity vulnerability in Erlang/OTP inets httpd allows a remote unauthenticated attacker to read files inside a mod_auth…
PriorityP353high8.2CVSS 4.0
AVNACLATPPRNUINVCHVINVANSCNSINSANEXCRXIRXARXMAVXMACXMATXMPRXMUIXMVCXMVIXMVAXMSCXMSIXMSAXSXAUXRXVXREXUX
EPSS
0.93%
60.3th percentile
Improper Handling of Case Sensitivity vulnerability in Erlang/OTP inets httpd allows a remote unauthenticated attacker to read files inside a mod_auth protected directory by requesting them with different casing, on deployments whose filesystem is case-insensitive.
mod_auth:secret_path/3 decides whether a resolved filesystem path lies inside a protected directory block by running the configured directory path through re:run/3 without the caseless option. A request for /secret/file against a directory configured as /Secret therefore does not match, so the request is treated as unprotected and no authentication challenge is issued, while the filesystem resolves the differently cased path to the same file and mod_get serves it. Deployments on case-sensitive filesystems are unaffected, because there the filesystem itself rejects the mismatched casing.
This issue affects OTP from OTP 17.0 before OTP 27.3.4.17, from OTP 28.0 before OTP 28.5.0.6, and from OTP 29.0 before OTP 29.0.6, corresponding to inets from 5.10 before 9.3.2.7, from 9.4 before 9.6.2.3, and from 9.7 before 9.7.2. Whether OTP before OTP 17.0, corresponding to inets before 5.10, is affected is unknown.
Affected
8 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| erlang | otp | >= 17.0 < 27.3.4.17 | 27.3.4.17 |
| erlang | otp | >= 28.0 < 28.5.0.6 | 28.5.0.6 |
| erlang | otp | >= 29.0 < 29.0.6 | 29.0.6 |
| erlang | otp | >= 5.10 < 9.3.2.7 | 9.3.2.7 |
| erlang | otp | >= 84adefa331c4159d432d22840663c38f155cd4c1 < * | * |
| erlang | otp | >= 9.4 < 9.6.2.3 | 9.6.2.3 |
| erlang | otp | >= 9.7 < 9.7.2 | 9.7.2 |
| ubuntu | erlang | — | — |
CVSS provenance
nvdv4.08.2HIGHCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat8.2HIGH
vendor_ubuntu7.5HIGH
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Ubuntu
Erlang vulnerabilities
vendor_ubuntu·2026-09-28·CVSS 7.5
CVE-2026-23941 [HIGH] Erlang vulnerabilities
Title: Erlang vulnerabilities
Summary: Several security issues were fixed in Erlang.
It was discovered that the Erlang Port Mapper Daemon did not properly
handle slow connections. A remote attacker could possibly use this issue
to cause a denial of service. (CVE-2026-42792)
It was discovered that Erlang incorrectly handled certain external term
format data, leading to heap corruption. An attacker could possibly use
this issue to cause Erlang to crash, resulting in a denial of service.
This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS.
(CVE-2026-55737)
It was discovered that Erlang incorrectly handled invalid external term
format data. An attacker could possibly use this issue to cause Erlang to
crash, resulting in a denial of service. This issue only affected Ubuntu
26.04
Red Hat
erlang: inets: Erlang/OTP inets httpd: Information disclosure via case-insensitive path bypass
vendor_redhat·2026-09-01·CVSS 8.2
CVE-2026-73270 [HIGH] CWE-178 erlang: inets: Erlang/OTP inets httpd: Information disclosure via case-insensitive path bypass
erlang: inets: Erlang/OTP inets httpd: Information disclosure via case-insensitive path bypass
Improper Handling of Case Sensitivity vulnerability in Erlang/OTP inets httpd allows a remote unauthenticated attacker to read files inside a mod_auth protected directory by requesting them with different casing, on deployments whose filesystem is case-insensitive.
mod_auth:secret_path/3 decides whether a resolved filesystem path lies inside a protected directory block by running the configured directory path through re:run/3 without the caseless option. A request for /secret/file against a directory configured as /Secret therefore does not match, so the request is treated as unprotected and no authentication challenge is issued, while the filesystem resolves the differently cased path to the sa
No detection rules found.
No public exploits indexed.
https://cna.erlef.org/cves/CVE-2026-73270.htmlhttps://github.com/erlang/otp/commit/9641944a2efbf55bea760f8ff7ba777fe3a0961chttps://github.com/erlang/otp/commit/bac19eb3dbd96cc49b6d8cabc1c04248bf8c79f6https://github.com/erlang/otp/commit/d8878dec0ececc2eab18e47bb18b472f224ca633https://github.com/erlang/otp/security/advisories/GHSA-mh78-93cr-jx8fhttps://osv.dev/vulnerability/EEF-CVE-2026-73270https://www.erlang.org/doc/system/versions.html#order-of-versions
2026-09-01
Published