CVE-2026-5773

libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers.

libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead.

When reusing a connection a range of criteria must be met. Due to a logical error in the code, a network transfer operation that was requested by an application could wrongfully reuse an existing SMB connection to the same server that was using a different "share" than the new subsequent transfer should.

This could in unlucky situations lead to the download of the wrong file or the upload of a file to the wrong place. When this happens, the same credentials are used and the server name is the same.

libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a network transfer operation that was requested by an application could wrongfully reuse an existing SMB connection to the same server that was using a different "share" than the new subsequent transfer should. This could in unlucky situations lead to the download of the wrong file or the upload of a file to the wrong place. When this happens, the same credentials are used and the server name is the same.

libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers.

libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead.

When reusing a connection a range of criteria must be met. Due to a logical error in the code, a network transfer operation that was requested by an application could wrongfully reuse an existing SMB connection to the same server that was using a different 'share' than the new subsequent transfer should.

This could in unlucky situations lead to the download of the wrong file or the upload of a file to the wrong place. When this happens, the same credentials are used and the server name is the same.

cURL is a computer software project providing a library (libcurl) and command-line tool (curl) for transferring data using various protocols.

Security Fix(es):

A vulnerability exists where a connection requiring TLS incorrectly reuses an existing unencrypted connection from the same connection pool. If an initial transfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request to that same host bypasses the TLS requirement and instead transmit data unencrypted.(CVE-2026-4873)

libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTP(S) request after a Negotiate-authenticated one, when both use the same host.

libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead.

When reusing a connection a range of criteria must be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different credentials.

An application that first uses Negotiate authentication to a server with user1:password1 and then does another operation to the same server asking for any authentication method but for user2:password2 (while the previous connection is still alive) - the second request gets confused and wrongly reuses the same connection and sends the new request over that connection thinking it uses a mix of user1's and user2's credentials when it is in fact still using the connection authenticated for user1...(CVE-2026-5545)

libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers.

libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead.

When reusing a connection a range of criteria must be met. Due to a logical error in the code, a network transfer operation that was requested by an application could wrongfully reuse an existing SMB connection to the same server that was using a different 'share' than the new subsequent transfer should.

This could in unlucky situations lead to the download of the wrong file or the upload of a file to the wrong place. When this happens, the same credentials are used and the server name is the same.(CVE-2026-5773)

curl might erroneously pass on credentials for a first proxy to a second proxy.

This can happen when the following conditions are true:

1. curl is setup to use specific different proxies for different URL schemes
2. the first proxy needs credentials
3. the second proxy uses no credentials
4. while using the first proxy (using say http://), curl is asked to follow a redirect to a URL using another scheme (say https://), accessed using a second, different, proxy(CVE-2026-6253)

Using libcurl, when a custom Host: header is first set for an HTTP request and a second request is subsequently done using the same easy handle but without the custom Host: header set, the second request would use stale information and pass on cookies meant for the first host in the second request. Leak them.(CVE-2026-6276)

When asked to both use a .netrc file for credentials and to follow HTTP redirects, libcurl could leak the password used for the first host to the followed-to host under certain circumstances.(CVE-2026-6429)

Successfully using libcurl to do a transfer over a specific HTTP proxy (proxyA) with Digest authentication and then changing the proxy host to a second one (proxyB) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the Proxy-Authorization: header field meant for proxyA, to proxyB.(CVE-2026-7168)

cURL is a computer software project providing a library (libcurl) and command-line tool (curl) for transferring data using various protocols.

Security Fix(es):

A vulnerability exists where a connection requiring TLS incorrectly reuses an existing unencrypted connection from the same connection pool. If an initial transfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request to that same host bypasses the TLS requirement and instead transmit data unencrypted.(CVE-2026-4873)

libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTP(S) request after a Negotiate-authenticated one, when both use the same host.

libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead.

When reusing a connection a range of criteria must be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different credentials.

An application that first uses Negotiate authentication to a server with user1:password1 and then does another operation to the same server asking for any authentication method but for user2:password2 (while the previous connection is still alive) - the second request gets confused and wrongly reuses the same connection and sends the new request over that connection thinking it uses a mix of user1's and user2's credentials when it is in fact still using the connection authenticated for user1...(CVE-2026-5545)

libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers.

libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead.

When reusing a connection a range of criteria must be met. Due to a logical error in the code, a network transfer operation that was requested by an application could wrongfully reuse an existing SMB connection to the same server that was using a different 'share' than the new subsequent transfer should.

This could in unlucky situations lead to the download of the wrong file or the upload of a file to the wrong place. When this happens, the same credentials are used and the server name is the same.(CVE-2026-5773)

curl might erroneously pass on credentials for a first proxy to a second proxy.

This can happen when the following conditions are true:

1. curl is setup to use specific different proxies for different URL schemes
2. the first proxy needs credentials
3. the second proxy uses no credentials
4. while using the first proxy (using say http://), curl is asked to follow a redirect to a URL using another scheme (say https://), accessed using a second, different, proxy(CVE-2026-6253)

Using libcurl, when a custom Host: header is first set for an HTTP request and a second request is subsequently done using the same easy handle but without the custom Host: header set, the second request would use stale information and pass on cookies meant for the first host in the second request. Leak them.(CVE-2026-6276)

When asked to both use a .netrc file for credentials and to follow HTTP redirects, libcurl could leak the password used for the first host to the followed-to host under certain circumstances.(CVE-2026-6429)

Successfully using libcurl to do a transfer over a specific HTTP proxy (proxyA) with Digest authentication and then changing the proxy host to a second one (proxyB) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the Proxy-Authorization: header field meant for proxyA, to proxyB.(CVE-2026-7168)

cURL is a computer software project providing a library (libcurl) and command-line tool (curl) for transferring data using various protocols.

Security Fix(es):

A vulnerability exists where a connection requiring TLS incorrectly reuses an existing unencrypted connection from the same connection pool. If an initial transfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request to that same host bypasses the TLS requirement and instead transmit data unencrypted.(CVE-2026-4873)

libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTP(S) request after a Negotiate-authenticated one, when both use the same host.

libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead.

When reusing a connection a range of criteria must be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different credentials.

An application that first uses Negotiate authentication to a server with user1:password1 and then does another operation to the same server asking for any authentication method but for user2:password2 (while the previous connection is still alive) - the second request gets confused and wrongly reuses the same connection and sends the new request over that connection thinking it uses a mix of user1's and user2's credentials when it is in fact still using the connection authenticated for user1...(CVE-2026-5545)

libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers.

libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead.

When reusing a connection a range of criteria must be met. Due to a logical error in the code, a network transfer operation that was requested by an application could wrongfully reuse an existing SMB connection to the same server that was using a different 'share' than the new subsequent transfer should.

This could in unlucky situations lead to the download of the wrong file or the upload of a file to the wrong place. When this happens, the same credentials are used and the server name is the same.(CVE-2026-5773)

curl might erroneously pass on credentials for a first proxy to a second proxy.

This can happen when the following conditions are true:

1. curl is setup to use specific different proxies for different URL schemes
2. the first proxy needs credentials
3. the second proxy uses no credentials
4. while using the first proxy (using say http://), curl is asked to follow a redirect to a URL using another scheme (say https://), accessed using a second, different, proxy(CVE-2026-6253)

Using libcurl, when a custom Host: header is first set for an HTTP request and a second request is subsequently done using the same easy handle but without the custom Host: header set, the second request would use stale information and pass on cookies meant for the first host in the second request. Leak them.(CVE-2026-6276)

When asked to both use a .netrc file for credentials and to follow HTTP redirects, libcurl could leak the password used for the first host to the followed-to host under certain circumstances.(CVE-2026-6429)

Successfully using libcurl to do a transfer over a specific HTTP proxy (proxyA) with Digest authentication and then changing the proxy host to a second one (proxyB) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the Proxy-Authorization: header field meant for proxyA, to proxyB.(CVE-2026-7168)

cURL is a computer software project providing a library (libcurl) and command-line tool (curl) for transferring data using various protocols.

Security Fix(es):

A vulnerability exists where a connection requiring TLS incorrectly reuses an existing unencrypted connection from the same connection pool. If an initial transfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request to that same host bypasses the TLS requirement and instead transmit data unencrypted.(CVE-2026-4873)

libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTP(S) request after a Negotiate-authenticated one, when both use the same host.

libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead.

When reusing a connection a range of criteria must be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different credentials.

An application that first uses Negotiate authentication to a server with user1:password1 and then does another operation to the same server asking for any authentication method but for user2:password2 (while the previous connection is still alive) - the second request gets confused and wrongly reuses the same connection and sends the new request over that connection thinking it uses a mix of user1's and user2's credentials when it is in fact still using the connection authenticated for user1...(CVE-2026-5545)

libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers.

libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead.

When reusing a connection a range of criteria must be met. Due to a logical error in the code, a network transfer operation that was requested by an application could wrongfully reuse an existing SMB connection to the same server that was using a different 'share' than the new subsequent transfer should.

This could in unlucky situations lead to the download of the wrong file or the upload of a file to the wrong place. When this happens, the same credentials are used and the server name is the same.(CVE-2026-5773)

curl might erroneously pass on credentials for a first proxy to a second proxy.

This can happen when the following conditions are true:

1. curl is setup to use specific different proxies for different URL schemes
2. the first proxy needs credentials
3. the second proxy uses no credentials
4. while using the first proxy (using say http://), curl is asked to follow a redirect to a URL using another scheme (say https://), accessed using a second, different, proxy(CVE-2026-6253)

Using libcurl, when a custom Host: header is first set for an HTTP request and a second request is subsequently done using the same easy handle but without the custom Host: header set, the second request would use stale information and pass on cookies meant for the first host in the second request. Leak them.(CVE-2026-6276)

When asked to both use a .netrc file for credentials and to follow HTTP redirects, libcurl could leak the password used for the first host to the followed-to host under certain circumstances.(CVE-2026-6429)

Successfully using libcurl to do a transfer over a specific HTTP proxy (proxyA) with Digest authentication and then changing the proxy host to a second one (proxyB) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the Proxy-Authorization: header field meant for proxyA, to proxyB.(CVE-2026-7168)

cURL is a computer software project providing a library (libcurl) and command-line tool (curl) for transferring data using various protocols.

Security Fix(es):

A vulnerability exists where a connection requiring TLS incorrectly reuses an existing unencrypted connection from the same connection pool. If an initial transfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request to that same host bypasses the TLS requirement and instead transmit data unencrypted.(CVE-2026-4873)

libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTP(S) request after a Negotiate-authenticated one, when both use the same host.

libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead.

When reusing a connection a range of criteria must be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different credentials.

An application that first uses Negotiate authentication to a server with user1:password1 and then does another operation to the same server asking for any authentication method but for user2:password2 (while the previous connection is still alive) - the second request gets confused and wrongly reuses the same connection and sends the new request over that connection thinking it uses a mix of user1's and user2's credentials when it is in fact still using the connection authenticated for user1...(CVE-2026-5545)

libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers.

libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead.

When reusing a connection a range of criteria must be met. Due to a logical error in the code, a network transfer operation that was requested by an application could wrongfully reuse an existing SMB connection to the same server that was using a different 'share' than the new subsequent transfer should.

This could in unlucky situations lead to the download of the wrong file or the upload of a file to the wrong place. When this happens, the same credentials are used and the server name is the same.(CVE-2026-5773)

curl might erroneously pass on credentials for a first proxy to a second proxy.

This can happen when the following conditions are true:

1. curl is setup to use specific different proxies for different URL schemes
2. the first proxy needs credentials
3. the second proxy uses no credentials
4. while using the first proxy (using say http://), curl is asked to follow a redirect to a URL using another scheme (say https://), accessed using a second, different, proxy(CVE-2026-6253)

Using libcurl, when a custom Host: header is first set for an HTTP request and a second request is subsequently done using the same easy handle but without the custom Host: header set, the second request would use stale information and pass on cookies meant for the first host in the second request. Leak them.(CVE-2026-6276)

When asked to both use a .netrc file for credentials and to follow HTTP redirects, libcurl could leak the password used for the first host to the followed-to host under certain circumstances.(CVE-2026-6429)

Successfully using libcurl to do a transfer over a specific HTTP proxy (proxyA) with Digest authentication and then changing the proxy host to a second one (proxyB) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the Proxy-Authorization: header field meant for proxyA, to proxyB.(CVE-2026-7168)

Root has patched CVE-2026-5773 in the curl package for Root:Alpine:3.15. Multiple fixed versions available.

Root has patched CVE-2026-5773 in the curl package for Root:Alpine:3.17. Multiple fixed versions available.

Root has patched CVE-2026-5773 in the curl package for Root:Alpine:3.20. Multiple fixed versions available.

Root has patched CVE-2026-5773 in the curl package for Root:Alpine:3.21. Multiple fixed versions available.

Root has patched CVE-2026-5773 in the curl package for Root:Alpine:3.22. Multiple fixed versions available.

Root has patched CVE-2026-5773 in the curl package for Root:Debian:11. Multiple fixed versions available.

Root has patched CVE-2026-5773 in the rootio-curl package for Root:Debian:12. Multiple fixed versions available.

Root has patched CVE-2026-5773 in the rootio-curl package for Root:Debian:13. Multiple fixed versions available.

libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a network transfer operation that was requested by an application could wrongfully reuse an existing SMB connection to the same server that was using a different "share" than the new subsequent transfer should. This could in unlucky situations lead to the download of the wrong file or the upload of a file to the wrong place. When this happens, the same credentials are used and the server name is the same.

• SECURITY UPDATE: wrong SMB connection reused due to missing share comparison
  • debian/patches/CVE-2026-5773.patch: disable connection reuse for SMB(S) by replacing connkeep with connclose in smb_connect (lib/smb.c)
  • CVE-2026-5773

• CVE-2026-5773: disable connection reuse for SMB(S) to prevent libcurl from reusing a connection to the same server for a different SMB share

• CVE-2026-5773: disable connection reuse for SMB(S) to prevent libcurl from reusing a connection to the same server for a different SMB share

• CVE-2026-5773: disable connection reuse for SMB(S) to prevent libcurl from reusing a connection to the same server for a different SMB share

• CVE-2026-5773: wrong reuse of SMB connection; disable connection reuse for SMB(S) so a subsequent transfer cannot wrongfully reuse a pooled connection to a different share
• CVE-2026-6276: clear stale custom-Host cookiehost between requests on the same easy handle (cookie leak across origins)

• SECURITY UPDATE: libcurl may reuse the wrong connection for SMB(S) transfers, leading to access of an unintended SMB share with the same credentials.
  • debian/patches/CVE-2026-5773.patch: disable connection reuse for SMB(S) in lib/url.c by returning early from ConnectionExists() when the requested protocol is SMB or SMBS.
  • CVE-2026-5773

• SECURITY UPDATE: libcurl may reuse the wrong connection for SMB(S) transfers, leading to access of an unintended SMB share with the same credentials.
  • debian/patches/CVE-2026-5773.patch: disable connection reuse for SMB(S) in lib/url.c by returning early from ConnectionExists() when the requested protocol is SMB or SMBS.
  • CVE-2026-5773
• test46-bump-cookie-expiry.patch: bump the hard-coded cookie expiry timestamp in tests/data/test46 from 2025-02-10 to 2099-01-01 so the cookie-jar test no longer fails on systems whose wall clock has advanced past February 2025.

• SECURITY UPDATE: wrong reuse of SMB connection
  • debian/patches/CVE-2026-5773.patch: disable connection reuse for SMB(S) in lib/smb.c.
  • CVE-2026-5773

• CVE-2026-5773: wrong reuse of SMB connection; disable connection reuse for SMB(S) so a subsequent transfer cannot wrongfully reuse a pooled connection to a different share
• CVE-2026-6276: clear stale custom-Host cookiehost between requests on the same easy handle (cookie leak across origins)

libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers.

libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead.

When reusing a connection a range of criteria must be met. Due to a logical error in the code, a network transfer operation that was requested by an application could wrongfully reuse an existing SMB connection to the same server that was using a different "share" than the new subsequent transfer should.

This could in unlucky situations lead to the download of the wrong file or the upload of a file to the wrong place. When this happens, the same credentials are used and the server name is the same.

These are all security issues fixed in the curl-8.20.0-1.1 package on the GA media of openSUSE Tumbleweed.

This update for curl fixes the following issues:

• CVE-2026-5773: wrong reuse of SMB connection (bsc#1262633).
• CVE-2026-7168: cross-proxy Digest auth state leak (bsc#1263440).
• CVE-2026-8926: password leak with netrc and user in URL (bsc#1268412).
• CVE-2026-13608: OpenLDAP SASL authentication bypass (bsc#1277476).
• CVE-2026-80229: OpenSSL provider use-after-free (bsc#1277479).
• CVE-2026-80230: OpenSSL pinning bypass (bsc#1277480).

This update for curl fixes the following issues:

• CVE-2026-5773: wrong reuse of SMB connection (bsc#1262633).
• CVE-2026-7168: cross-proxy Digest auth state leak (bsc#1263440).
• CVE-2026-8926: password leak with netrc and user in URL (bsc#1268412).

Changes for curl:

• Call http_size() first to prioritize Transfer-Encoding: chunked over a zero Content-Length empty body check (bsc#1264971)

This update for curl fixes the following issues:

• CVE-2026-5773: wrong reuse of SMB connection (bsc#1262633).
• CVE-2026-7168: cross-proxy Digest auth state leak (bsc#1263440).
• CVE-2026-8926: password leak with netrc and user in URL (bsc#1268412).

Changes for curl:

• Call http_size() first to prioritize Transfer-Encoding: chunked over a zero Content-Length empty body check (bsc#1264971)

This update for curl fixes the following issues:

• CVE-2026-5773: wrong reuse of SMB connection (bsc#1262633).
• CVE-2026-7168: cross-proxy Digest auth state leak (bsc#1263440).
• CVE-2026-8926: password leak with netrc and user in URL (bsc#1268412).
• CVE-2026-13608: OpenLDAP SASL authentication bypass (bsc#1277476).
• CVE-2026-80229: OpenSSL provider use-after-free (bsc#1277479).
• CVE-2026-80230: OpenSSL pinning bypass (bsc#1277480).

This update for curl fixes the following issues:

• CVE-2026-5773: wrong reuse of SMB connection (bsc#1262633).
• CVE-2026-7168: cross-proxy Digest auth state leak (bsc#1263440).
• CVE-2026-8926: password leak with netrc and user in URL (bsc#1268412).
• CVE-2026-13608: OpenLDAP SASL authentication bypass (bsc#1277476).
• CVE-2026-80229: OpenSSL provider use-after-free (bsc#1277479).
• CVE-2026-80230: OpenSSL pinning bypass (bsc#1277480).

This update for curl fixes the following issues

• CVE-2026-4873: connection reuse ignores TLS requirement (bsc#1262631).
• CVE-2026-5545: wrong reuse of HTTP Negotiate connection (bsc#1262632).
• CVE-2026-5773: wrong reuse of SMB connection (bsc#1262633).
• CVE-2026-6253: proxy credentials leak over redirect-to proxy (bsc#1262635).
• CVE-2026-6276: stale custom cookie host causes cookie leak (bsc#1262636).
• CVE-2026-6429: netrc credential leak with reused proxy connection (bsc#1262638).

This update for curl fixes the following issues:

• CVE-2026-5545: wrong reuse of HTTP Negotiate connection (bsc#1262632).
• CVE-2026-5773: wrong reuse of SMB connection (bsc#1262633).
• CVE-2026-6253: proxy credentials leak over redirect-to proxy (bsc#1262635).
• CVE-2026-6276: stale custom cookie host causes cookie leak (bsc#1262636).
• CVE-2026-6429: netrc credential leak with reused proxy connection (bsc#1262638).
• CVE-2026-7168: cross-proxy Digest auth state leak (bsc#1263440).
• CVE-2026-8926: password leak with netrc and user in URL (bsc#1268412).

This update for curl fixes the following issues:

• CVE-2026-5773: wrong reuse of SMB connection (bsc#1262633).
• CVE-2026-7168: cross-proxy Digest auth state leak (bsc#1263440).
• CVE-2026-8926: password leak with netrc and user in URL (bsc#1268412).
• CVE-2026-13608: flow in OpenLDAP SASL negotiation can cause an authentication bypass (bsc#1277476).
• CVE-2026-80229: premature free can lead to OpenSSL provider use-after-free (bsc#1277479).
• CVE-2026-80230: OpenSSL pinning bypass can allow unauthenticated connections to succeed (bsc#1277480).

Changes for curl:

• Call http_size() first to prioritize Transfer-Encoding: chunked over a zero Content-Length empty body check (bsc#1264971)

This update for curl fixes the following issues:

• CVE-2026-5773: wrong reuse of SMB connection (bsc#1262633).
• CVE-2026-7168: cross-proxy Digest auth state leak (bsc#1263440).
• CVE-2026-8926: password leak with netrc and user in URL (bsc#1268412).
• CVE-2026-13608: flow in OpenLDAP SASL negotiation can cause an authentication bypass (bsc#1277476).
• CVE-2026-80229: premature free can lead to OpenSSL provider use-after-free (bsc#1277479).
• CVE-2026-80230: OpenSSL pinning bypass can allow unauthenticated connections to succeed (bsc#1277480).

Changes for curl:

• Call http_size() first to prioritize Transfer-Encoding: chunked over a zero Content-Length empty body check (bsc#1264971)