Affected versions of the eventlet package are vulnerable to Request Smuggling due to improper handling of HTTP trailer sections. The eventlet.wsgi module’s _chunked_read method read only a single line after the terminating 0\r\n chunk and failed to consume remaining trailer lines, leaving bytes in the connection buffer that could be interpreted as the start of a subsequent request.

Eventlet affected versions contain a vulnerability in HTTP header processing within the WSGI implementation. This flaw could allow attackers to craft specially formatted headers, potentially causing header name collisions or overwriting important headers in the WSGI environment. Such manipulation could lead to security issues depending on how applications process these headers.

Eventlet 0.34.3 addresses a security concern by adhering to RFC 9112 standards, now rejecting requests that include both content-length and transfer-encoding headers simultaneously, a practice that violates the RFC and could pose security risks. However, the reject_bad_request option, if disabled, allows these requests for compatibility with older servers that cannot be updated.
https://github.com/eventlet/eventlet/pull/826/commits/3e50a26878ed08e6a7f510d8d3bc49cf7ee970ed

Eventlet before 0.35.2, as used in dnspython before 2.6.0, allows remote attackers to interfere with DNS name resolution by quickly sending an invalid packet from the expected IP address and source port, aka a "TuDoor" attack. In other words, dnspython does not have the preferred behavior in which the DNS name resolution algorithm would proceed, within the full time window, in order to wait for a valid packet. 
NOTE: dnspython 2.6.0 is unusable for a different reason that was addressed in 2.6.1.

Eventlet 0.31.0 includes a fix for CVE-2021-21419: A websocket peer may exhaust memory on Eventlet side by sending very large websocket frames. Malicious peer may exhaust memory on Eventlet side by sending highly compressed data frame. A patch in version 0.31.0 restricts websocket frame to reasonable limits. As a workaround, restricting memory usage via OS limits would help against overall machine exhaustion, but there is no workaround to protect Eventlet process.

Affected versions of the lxml package are vulnerable to XML External Entity Injection due to insecure default parser configuration that resolves external entities. The iterparse() function and the ETCompatXMLParser() class both default to resolve_entities=True, so untrusted XML input processed through either parser will expand external entity references and read referenced local files from the host. An attacker who supplies a crafted XML document to an application using these parsers in their default configuration can read sensitive local files and exfiltrate their contents through the parsed output.

Lxml 4.9.1 includes a fix for CVE-2022-2309: NULL Pointer Dereference allows attackers to cause a denial of service (or application crash). This only applies when lxml is used together with libxml2 2.9.10 through 2.9.14. libxml2 2.9.9 and earlier are not affected. It allows triggering crashes through forged input data, given a vulnerable code sequence in the application. The vulnerability is caused by the iterwalk function (also used by the canonicalize function). Such code shouldn't be in wide-spread use, given that parsing + iterwalk would usually be replaced with the more efficient iterparse function. However, an XML converter that serialises to C14N would also be vulnerable, for example, and there are legitimate use cases for this code sequence. If untrusted input is received (also remotely) and processed via iterwalk function, a crash can be triggered.

Lxml 4.6.5 includes a fix for CVE-2021-43818: Prior to version 4.6.5, the HTML Cleaner in lxml.html lets certain crafted script content pass through, as well as script content in SVG files embedded using data URIs. Users that employ the HTML cleaner in a security relevant context should upgrade to lxml 4.6.5 to receive a patch.

Affected versions of the lxml package are vulnerable to XML External Entity Injection due to insecure default parser configuration that resolves external entities. The iterparse() function and the ETCompatXMLParser() class both default to resolve_entities=True, so untrusted XML input processed through either parser will expand external entity references and read referenced local files from the host. An attacker who supplies a crafted XML document to an application using these parsers in their default configuration can read sensitive local files and exfiltrate their contents through the parsed output.

Lxml 4.9.1 includes a fix for CVE-2022-2309: NULL Pointer Dereference allows attackers to cause a denial of service (or application crash). This only applies when lxml is used together with libxml2 2.9.10 through 2.9.14. libxml2 2.9.9 and earlier are not affected. It allows triggering crashes through forged input data, given a vulnerable code sequence in the application. The vulnerability is caused by the iterwalk function (also used by the canonicalize function). Such code shouldn't be in wide-spread use, given that parsing + iterwalk would usually be replaced with the more efficient iterparse function. However, an XML converter that serialises to C14N would also be vulnerable, for example, and there are legitimate use cases for this code sequence. If untrusted input is received (also remotely) and processed via iterwalk function, a crash can be triggered.

Lxml 4.6.5 includes a fix for CVE-2021-43818: Prior to version 4.6.5, the HTML Cleaner in lxml.html lets certain crafted script content pass through, as well as script content in SVG files embedded using data URIs. Users that employ the HTML cleaner in a security relevant context should upgrade to lxml 4.6.5 to receive a patch.

Affected versions of the eventlet package are vulnerable to Request Smuggling due to improper handling of HTTP trailer sections. The eventlet.wsgi module’s _chunked_read method read only a single line after the terminating 0\r\n chunk and failed to consume remaining trailer lines, leaving bytes in the connection buffer that could be interpreted as the start of a subsequent request.

Eventlet affected versions contain a vulnerability in HTTP header processing within the WSGI implementation. This flaw could allow attackers to craft specially formatted headers, potentially causing header name collisions or overwriting important headers in the WSGI environment. Such manipulation could lead to security issues depending on how applications process these headers.

Eventlet 0.34.3 addresses a security concern by adhering to RFC 9112 standards, now rejecting requests that include both content-length and transfer-encoding headers simultaneously, a practice that violates the RFC and could pose security risks. However, the reject_bad_request option, if disabled, allows these requests for compatibility with older servers that cannot be updated.
https://github.com/eventlet/eventlet/pull/826/commits/3e50a26878ed08e6a7f510d8d3bc49cf7ee970ed

Eventlet before 0.35.2, as used in dnspython before 2.6.0, allows remote attackers to interfere with DNS name resolution by quickly sending an invalid packet from the expected IP address and source port, aka a "TuDoor" attack. In other words, dnspython does not have the preferred behavior in which the DNS name resolution algorithm would proceed, within the full time window, in order to wait for a valid packet. 
NOTE: dnspython 2.6.0 is unusable for a different reason that was addressed in 2.6.1.

Eventlet 0.31.0 includes a fix for CVE-2021-21419: A websocket peer may exhaust memory on Eventlet side by sending very large websocket frames. Malicious peer may exhaust memory on Eventlet side by sending highly compressed data frame. A patch in version 0.31.0 restricts websocket frame to reasonable limits. As a workaround, restricting memory usage via OS limits would help against overall machine exhaustion, but there is no workaround to protect Eventlet process.

Affected versions of the eventlet package are vulnerable to Request Smuggling due to improper handling of HTTP trailer sections. The eventlet.wsgi module’s _chunked_read method read only a single line after the terminating 0\r\n chunk and failed to consume remaining trailer lines, leaving bytes in the connection buffer that could be interpreted as the start of a subsequent request.

Eventlet affected versions contain a vulnerability in HTTP header processing within the WSGI implementation. This flaw could allow attackers to craft specially formatted headers, potentially causing header name collisions or overwriting important headers in the WSGI environment. Such manipulation could lead to security issues depending on how applications process these headers.

Eventlet 0.34.3 addresses a security concern by adhering to RFC 9112 standards, now rejecting requests that include both content-length and transfer-encoding headers simultaneously, a practice that violates the RFC and could pose security risks. However, the reject_bad_request option, if disabled, allows these requests for compatibility with older servers that cannot be updated.
https://github.com/eventlet/eventlet/pull/826/commits/3e50a26878ed08e6a7f510d8d3bc49cf7ee970ed

Eventlet before 0.35.2, as used in dnspython before 2.6.0, allows remote attackers to interfere with DNS name resolution by quickly sending an invalid packet from the expected IP address and source port, aka a "TuDoor" attack. In other words, dnspython does not have the preferred behavior in which the DNS name resolution algorithm would proceed, within the full time window, in order to wait for a valid packet. 
NOTE: dnspython 2.6.0 is unusable for a different reason that was addressed in 2.6.1.

Eventlet 0.31.0 includes a fix for CVE-2021-21419: A websocket peer may exhaust memory on Eventlet side by sending very large websocket frames. Malicious peer may exhaust memory on Eventlet side by sending highly compressed data frame. A patch in version 0.31.0 restricts websocket frame to reasonable limits. As a workaround, restricting memory usage via OS limits would help against overall machine exhaustion, but there is no workaround to protect Eventlet process.

Affected versions of the eventlet package are vulnerable to Request Smuggling due to improper handling of HTTP trailer sections. The eventlet.wsgi module’s _chunked_read method read only a single line after the terminating 0\r\n chunk and failed to consume remaining trailer lines, leaving bytes in the connection buffer that could be interpreted as the start of a subsequent request.

Eventlet affected versions contain a vulnerability in HTTP header processing within the WSGI implementation. This flaw could allow attackers to craft specially formatted headers, potentially causing header name collisions or overwriting important headers in the WSGI environment. Such manipulation could lead to security issues depending on how applications process these headers.

Eventlet 0.34.3 addresses a security concern by adhering to RFC 9112 standards, now rejecting requests that include both content-length and transfer-encoding headers simultaneously, a practice that violates the RFC and could pose security risks. However, the reject_bad_request option, if disabled, allows these requests for compatibility with older servers that cannot be updated.
https://github.com/eventlet/eventlet/pull/826/commits/3e50a26878ed08e6a7f510d8d3bc49cf7ee970ed

Eventlet before 0.35.2, as used in dnspython before 2.6.0, allows remote attackers to interfere with DNS name resolution by quickly sending an invalid packet from the expected IP address and source port, aka a "TuDoor" attack. In other words, dnspython does not have the preferred behavior in which the DNS name resolution algorithm would proceed, within the full time window, in order to wait for a valid packet. 
NOTE: dnspython 2.6.0 is unusable for a different reason that was addressed in 2.6.1.

Eventlet 0.31.0 includes a fix for CVE-2021-21419: A websocket peer may exhaust memory on Eventlet side by sending very large websocket frames. Malicious peer may exhaust memory on Eventlet side by sending highly compressed data frame. A patch in version 0.31.0 restricts websocket frame to reasonable limits. As a workaround, restricting memory usage via OS limits would help against overall machine exhaustion, but there is no workaround to protect Eventlet process.