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erlang vulnerabilities

Vulnerabilities published for erlang in the last 30 days: 2. Listed in the KEV catalogue: 0.

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Vulnerabilities: 73

  1. CVE-2026-105236

    Medium · CVSS 6.3EPSS 0.36%No fix published

    TLS 1.2 session resumption in ssl crosses SNI virtual-host client-certificate trust boundaries

    Improper Certificate Validation vulnerability in the ssl application in Erlang/OTP allows a client that holds a certificate trusted by one SNI virtual host to authenticate to a second SNI virtual host on the same listener by resuming its TLS 1.2 session there. A server that serves several SNI names from one listen socket through sni_fun or sni_hosts keeps one pre-TLS 1.3 session cache per listener and does not bind a cached session to the SNI name or client trust policy that established it. When an SNI option set switches to verify_peer without naming reuse_sessions, ssl_config:update_options/3 inherits the base listener's reuse_sessions val

    erlangOperating systems
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

  2. CVE-2026-94200

    High · CVSS 8.2EPSS 0.47%No fix published

    TLS 1.3 client ticket store crashed by NewSessionTicket with empty early_data extension in ssl

    Improper Validation of Consistency within Input vulnerability in Erlang OTP ssl (tls_handshake_1_3, ssl_handshake and tls_client_ticket_store modules) allows a malicious TLS 1.3 server to cause a denial of service of the ssl application on the client node. The TLS 1.3 client decodes the extensions of a NewSessionTicket message as if they came from EncryptedExtensions. It therefore accepts a 0-length early_data extension, a form that is only valid in ClientHello and EncryptedExtensions. With {session_tickets, auto}, the client stores the ticket in the node-global tls_client_ticket_store. On the next automatic resumption, tls_handshake_1_3:get

    erlangOperating systems
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

  3. CVE-2026-65634

    High · CVSS 8.2EPSS 0.27%No fix published

    Superlinear CPU denial of service in Erlang/OTP ASN.1 OBJECT IDENTIFIER decoder

    Inefficient algorithmic complexity in the Erlang/OTP asn1 OBJECT IDENTIFIER decoder allows a remote unauthenticated attacker to cause denial of service by sending a crafted OID during the TLS handshake. The BER OID decoder asn1rtt_ber:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_ber.erl and the equivalent PER helper asn1rtt_per_common:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_per_common.erl accumulate a base-128 subidentifier into an unbounded integer using (Av bsl 7) + H per continuation byte. Each shift and addition on the growing accumulator is linear in the number of bits already accumulated, giving quadratic total work in the size of

    erlangOperating systems
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

  4. CVE-2026-68956

    High · CVSS 7.1EPSS 0.38%No fix published

    SSH daemon allocates unbounded idle session channels, bypassing max_channels

    Allocation of Resources Without Limits or Throttling vulnerability in Erlang/OTP ssh allows an authenticated remote attacker to exhaust node memory by repeatedly opening session channels that are never assigned a handler. The "session" clause of ssh_connection:handle_msg/4 checks only minimal_remote_max_packet_size before calling setup_session/5, which unconditionally builds a #channel{} record and stores it in the ETS channel cache. The max_channels daemon option is consulted only by ssh_channel_sup:max_num_channels_not_exceeded/2, which counts supervisor children, so a channel that never gets a shell, exec, or subsystem handler is invisibl

    erlangOperating systems
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

  5. CVE-2026-89422

    Critical · CVSS 9.3EPSS 0.46%No fix published

    TLS 1.3 client skips server authentication when ServerHello carries an unsolicited pre_shared_key extension

    Key Exchange without Entity Authentication vulnerability in Erlang/OTP ssl allows a peer that answers a TLS 1.3 client connection to impersonate the intended server. A pre_shared_key extension in the ServerHello that the client never offered causes the client to complete the handshake without validating the server's certificate, so ssl:connect returns {ok, Socket} against a peer holding no certificate, no private key and no prior session. tls_client_connection_1_3:handle_server_hello/2 passes the received extension to tls_gen_connection_1_3:handle_resumption/2, which sets resumption = true on its mere presence without checking that the clien

    erlangOperating systems
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

  6. CVE-2026-69664

    High · CVSS 8.7EPSS 0.95%No fix published

    httpd parks a request worker indefinitely on a malformed chunk size sent after the headers

    Missing Release of Resource after Effective Lifetime vulnerability in Erlang/OTP inets httpd allows an unauthenticated remote attacker to cause denial of service by sending a request with a chunked body whose chunk-size line is not a hexadecimal number. The worker serving the connection is never released and no timeout reclaims it, so repeating the request across connections occupies every available worker and denies service to legitimate clients. No authentication is required and the default configuration is affected. The chunk-size line must arrive in a write separate from the headers. When the body accompanies the headers, httpd_request_h

    erlangOperating systems
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

  7. CVE-2026-70409

    Medium · CVSS 6.3EPSS 0.58%No fix published

    eldap does not bound the port component of a referral URL before integer conversion

    Improper Validation of Specified Quantity in Input vulnerability in Erlang/OTP eldap allows a malicious or compromised LDAP server to degrade availability by returning a referral URL whose port component is a very long run of digits. eldap:parse_port/2 passes the port substring straight to list_to_integer/1 with no length bound. The surrounding try ... catch only rejects a value that fails to parse, so a syntactically valid port of up to roughly 1.26 million digits converts successfully and costs the caller hundreds of milliseconds of arbitrary-precision arithmetic per referral. The conversion function itself is documented to accept integers

    erlangOperating systems
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

  8. CVE-2026-70405

    Medium · CVSS 6.3EPSS 0.71%No fix published

    snmp BER INTEGER decoder applies no size limit to attacker-supplied integer fields

    Improper Validation of Specified Quantity in Input vulnerability in Erlang/OTP snmp allows a remote attacker to degrade availability by sending an SNMP message containing a BER INTEGER whose length field is arbitrarily large. snmp_pdus:dec_integer_notag/1 defaults its size limit to infinity, and do_dec_integer_notag/2 then accumulates the value across every declared byte with a recursive shift and bitwise or. Work grows superlinearly in the declared length because each operation acts on a progressively larger bignum. The size-limited variant dec_integer_notag/2 exists but is reached from only one call site, dec_snmp_version/1, which bounds t

    erlangOperating systems
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

  9. CVE-2026-66835

    High · CVSS 8.2EPSS 0.97%No fix published

    httpd mod_auth directory protection bypassed by a doubled slash in the request path

    Path Equivalence vulnerability in Erlang/OTP inets httpd allows a remote unauthenticated attacker to read files inside a mod_auth protected directory by prefixing the request path with an extra slash. httpd_request:validate_uri/1 normalises the request URI with uri_string:normalize/1, which performs RFC 3986 dot-segment removal but does not collapse empty path segments, so a doubled slash survives. mod_alias:real_name/3 concatenates the document root with that URI, and mod_auth:secret_path/3 then decides whether the result lies inside a protected directory block by running the configured directory path as an unanchored regular expression aga

    erlangOperating systems
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

  10. CVE-2026-73270

    High · CVSS 8.2EPSS 0.93%No fix published

    httpd mod_auth directory protection bypassed by request path casing on case-insensitive filesystems

    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 f

    erlangOperating systems
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

  11. CVE-2026-75538

    High · CVSS 8.2EPSS 0.85%No fix published

    A Signed Length Overflow in Erlang/OTP's inet TCP Driver Overflows the Receive Buffer Into BEAM VM Memory From an Unauthenticated Peer

    An attacker that connects to an open Erlang TCP port that uses the inet driver with {packet,4} mode can use a signed overflow in an incorrect packet length calculation to overflow the receive buffer into the VM allocator area and beyond up to about 2 GB. This would easily trash the allocated block's allocator metadata footer, and the next block, if any, and most likely cause the BEAM VM to crash. Utilizing this with precision enough to achieve Remote Code Execution would be extremely unfeasible. 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

    erlangOperating systems
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

  12. CVE-2026-74994

    Medium · CVSS 6EPSS 0.63%No fix published

    inets, httpd: Authentication Bypass via Directory Namespace Collapse in httpd mod_auth

    The mod_auth module in OTP's inets httpd server, when configured with dets or mnesia authentication backends and multiple directory configuration blocks, collapses all directory blocks into a single shared user/group namespace. A user added to one protected directory is accepted as valid for all other protected directories on the same server instance. 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

    erlangOperating systems
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

  13. CVE-2026-74835

    High · CVSS 8.7EPSS 0.58%No fix published

    inets,httpd: Memory Exhaustion via Unenforced max_body_size During Chunked Body Reception

    The inets application HTTP server httpd fails to enforce a configured body-size limit on chunked request. 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.

    erlangOperating systems
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

  14. CVE-2026-73812

    High · CVSS 8.3EPSS 0.52%No fix published

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

    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, 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

    erlangOperating systems
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

  15. CVE-2026-73276

    High · CVSS 8.3EPSS 0.58%No fix published

    inets, httpd: HTTP Request Smuggling via Whitespace-Before-Colon Header Dropping i

    Gracefulness code ignored cases that should be rejected, resulting in possible HTTP Request Smuggling opportunities. This issue affects OTP from OTP 22.2 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 7.1.2 before 9.3.2.7, from 9.4 before 9.6.2.3, and from 9.7 before 9.7.2.

    erlangOperating systems
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

  16. CVE-2026-66357

    High · CVSS 8.3EPSS 0.58%No fix published

    inets,httpd:HTTP Request Smuggling via obs-fold Header Continuation

    httpd has never implemented obs-fold (RFC 2616 §2.2 / RFC 7230 §3.2.4 header continuation lines). Every CRLF followed by a non-CRLF octet unconditionally starts a new header. This missing feature became a security concern as the understanding of HTTP request smuggling attacks evolved. 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.

    erlangOperating systems
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

  17. CVE-2026-59696

    Medium · CVSS 6.9EPSS 0.71%No fix published

    uri_string does not bound the port component of a URI before integer conversion

    Improper Validation of Specified Quantity in Input vulnerability in Erlang/OTP stdlib allows a remote attacker to degrade availability by supplying a URI whose port component is a very long run of digits. uri_string:get_port/1 passes the port substring to binary_to_integer/1 with no length bound, catching only error:badarg, so a syntactically valid port of up to roughly 1.26 million digits converts successfully and costs the calling process hundreds of milliseconds of arbitrary-precision arithmetic. The conversion is reached from every authority-parsing path in uri_string:parse/1, including the host, registered-name, and IPv4 and IPv6 forms.

    erlangOperating systems
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

  18. CVE-2026-55951

    High · CVSS 8.2EPSS 0.69%No fix published

    httpc memory exhaustion via unbounded response header accumulation

    The Erlang/OTP httpc HTTP client does not enforce a limit on the total size of response headers received from a server. The max_header_size option defaults to nolimit, and httpc_response:parse_headers/6 accumulates every header into a list before the length check runs (which only fires after the terminating CRLF CRLF is received). A malicious or compromised HTTP server can send an arbitrarily large number of headers, or headers with very large values, causing the client process to allocate unbounded memory until the system runs out of memory or the BEAM VM crashes. A proof-of-concept server sending 100,000 headers of roughly 4000 bytes each

    erlangOperating systems
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

  19. CVE-2026-71380

    High · CVSS 8.7EPSS 0.67%No fix published

    httpd applies no timeout while receiving a request body, parking a worker on a stalled client

    Missing Release of Resource after Effective Lifetime vulnerability in Erlang/OTP inets httpd allows an unauthenticated remote attacker to cause denial of service by sending valid request headers with a large Content-Length and then stalling before the body is complete. httpd_request_handler:handle_info/2 cancels the request timeout as soon as a parse step succeeds, which includes the headers, and the clause that handles a decoder asking for more data re-arms the socket with {active, once} without setting any further timer. httpd_request:whole_body/2 returns such a continuation whenever the bytes received are fewer than the announced Content-

    erlangOperating systems
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

  20. CVE-2026-70399

    High · CVSS 8.7EPSS 0.93%No fix published

    httpd does not enforce the documented default max_clients connection limit

    Allocation of Resources Without Limits or Throttling vulnerability in Erlang/OTP inets httpd allows an unauthenticated remote attacker to cause denial of service by opening and holding open a large number of connections. The max_clients option is documented to default to 150, and the inets hardening guide presents that limit as the first layer of denial-of-service defence, but a server that does not set it explicitly accepts an unlimited number of simultaneous connections. Establishing the connections is sufficient; no valid request and no authentication are required. The accept gate in httpd_manager:handle_new_connection/4 reads the option

    erlangOperating systems
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

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