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NVD / CVE Program· CNA EEF

CVE-2026-73812: inets, httpd: HTTP Request Smuggling via Transfer-Encoding and Content-Length

HighCVSS 8.3 · v4.0—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 33/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.52% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Erlang OTP 27.3.4.17, 28.5.0.6, 29.0.6; azl3 erlang 26.2.5.21-4 on Azure Linux 3.0 26.2.5.21-6; azl3 erlang 26.2.5.21-6 on Azure Linux 3.0 26.2.5.21-6.

Low priority for now. Upgrade to Erlang OTP 27.3.4.17, 28.5.0.6, 29.0.6; azl3 erlang 26.2.5.21-4 on Azure Linux 3.0 26.2.5.21-6; azl3 erlang 26.2.5.21-6 on Azure Linux 3.0 26.2.5.21-6 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

httpd function check_header/3 rejects duplicate Content-Length (per CVE-2026-23941) but never checks for the TE+CL co-presence that RFC 9112 §6.3 identifies as a probable smuggling attempt. handle_body/3 frames by chunked and silently discards Content-Length. A CL-preferring front-end paired with chunked-preferring inets creates a classic CL.TE front-end/back-end desync. This issue affects OTP from OTP 17.0 before OTP 27.3.4.17, OTP 28.5.0.6, and OTP 29.0.6, corresponding to inets from 5.10 before 9.3.2.7, 9.6.2.3, and 9.7.2. Whether OTP before OTP 17.0, corresponding to inets before 5.10, is affected is unknown.

Published
Sep 1, 2026
Updated
Nov 11, 2026
EPSS
0.5% · 44th percentile

Report tools

JSON

Action score

33

Monitor

Low priority for now.

CVSS
33 / 40 · 8.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · EEF
8.3
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-73812

When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (EEF). Independent of NVD's CPE analysis and usually ahead of it.

  • Erlang OTP

    • 17.0 and lateraffected · otpfixed in 27.3.4.17, 28.5.0.6, 29.0.6
    • 5.10 and lateraffected · otpfixed in 9.3.2.7, 9.6.2.3, 9.7.2
    • 84adefa331c4159d432d22840663c38f155cd4c1 and later · before 591dc00dc99dc2a426167a3b5257c0c94bd45e91affected · git
    • 591dc00dc99dc2a426167a3b5257c0c94bd45e91 and laternot affected · git

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12erlangfrom 0—
Debian:13erlangbefore 1:27.3.4.1+dfsg-1+deb13u41:27.3.4.1+dfsg-1+deb13u4
Debian:14erlangbefore 1:29.0.6+dfsg-11:29.0.6+dfsg-1
Red Hat:hummingbird:1erlang27before 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-asn1before 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-common_testbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-compilerbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-cryptobefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-debuggerbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-dialyzerbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-diameterbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-edocbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-eldapbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-erl_interfacebefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-ertsbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-etbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-eunitbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-examplesbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-ftpbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-gdb-toolsbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-inetsbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-jinterfacebefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-kernelbefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1
Red Hat:hummingbird:1erlang27-megacobefore 0:27.3.4.17-0.1.hum10:27.3.4.17-0.1.hum1

+18

Same product

erlang: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-89422TLS 1.3 client skips server authentication when ServerHello carries an unsolicited pre_shared_key extension
    37Monitor
  • CVE-2026-74835inets,httpd: Memory Exhaustion via Unenforced max_body_size During Chunked Body Reception
    34Monitor
  • CVE-2026-71380httpd applies no timeout while receiving a request body, parking a worker on a stalled client
    34Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-73270Sep 1, 2026 · httpd mod_auth directory protection bypassed by request path casing on case-insensitive filesystems
    32Monitor
  • ← EarlierCVE-2026-73276Sep 1, 2026 · inets, httpd: HTTP Request Smuggling via Whitespace-Before-Colon Header Dropping i
    33Monitor
  • Later →CVE-2026-74994Sep 1, 2026 · inets, httpd: Authentication Bypass via Directory Namespace Collapse in httpd mod_auth
    24Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Erlang OTP27.3.4.17Vendor (CNA)
Erlang OTP28.5.0.6Vendor (CNA)
Erlang OTP29.0.6Vendor (CNA)
Erlang OTP591dc00dc99dc2a426167a3b5257c0c94bd45e91Vendor (CNA)
Erlang OTP9.3.2.7Vendor (CNA)
Erlang OTP9.6.2.3Vendor (CNA)
Erlang OTP9.7.2Vendor (CNA)
azl3 erlang 26.2.5.21-4 on Azure Linux 3.026.2.5.21-6Microsoft (MSRC)
azl3 erlang 26.2.5.21-6 on Azure Linux 3.026.2.5.21-6Microsoft (MSRC)
debian:erlang1:27.3.4.1+dfsg-1+deb13u4 · Debian:13Package registry (OSV)
debian:erlang1:29.0.6+dfsg-1 · Debian:14Package registry (OSV)
red hat:erlang270:27.3.4.17-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:erlang27-asn10:27.3.4.17-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:erlang27-common_test0:27.3.4.17-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:erlang27-compiler0:27.3.4.17-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:erlang27-crypto0:27.3.4.17-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:erlang27-debugger0:27.3.4.17-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:erlang27-dialyzer0:27.3.4.17-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:erlang27-diameter0:27.3.4.17-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:erlang27-edoc0:27.3.4.17-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:erlang27-eldap0:27.3.4.17-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:erlang27-erl_interface0:27.3.4.17-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:erlang27-erts0:27.3.4.17-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-663570 days apartinets,httpd:HTTP Request Smuggling via obs-fold Header Continuation
    33Monitor
  • CVE-2026-732760 days apartinets, httpd: HTTP Request Smuggling via Whitespace-Before-Colon Header Dropping i
    33Monitor

Not on record for this CVE: public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records