CVE-2024-6874

libcurl's URL API function curl_url_get() offers punycode conversions, to and from IDN. Asking to convert a name that is exactly 256 bytes, libcurl ends up reading outside of a stack based buffer when built to use the macidn IDN backend. The conversion function then fills up the provided buffer exactly - but does not null terminate the string.

This flaw can lead to stack contents accidently getting returned as part of the converted string.

libcurl's URL API function curl_url_get() offers punycode conversions, to and from IDN. Asking to convert a name that is exactly 256 bytes, libcurl ends up reading outside of a stack based buffer when built to use the macidn IDN backend. The conversion function then fills up the provided buffer exactly - but does not null terminate the string.

This flaw can lead to stack contents accidently getting returned as part of the converted string.

libcurl's URL API function curl_url_get() offers punycode conversions, to and from IDN. Asking to convert a name that is exactly 256 bytes, libcurl ends up reading outside of a stack based buffer when built to use the macidn IDN backend. The conversion function then fills up the provided buffer exactly - but does not null terminate the string.

This flaw can lead to stack contents accidently getting returned as part of the converted string.

libcurl's URL API function curl_url_get() offers punycode conversions, to and from IDN. Asking to convert a name that is exactly 256 bytes, libcurl ends up reading outside of a stack based buffer when built to use the macidn IDN backend. The conversion function then fills up the provided buffer exactly - but does not null terminate the string. This flaw can lead to stack contents accidently getting returned as part of the converted string.

libcurl's URL API function curl_url_get() offers punycode conversions, to and from IDN. Asking to convert a name that is exactly 256 bytes, libcurl ends up reading outside of a stack based buffer when built to use the macidn IDN backend. The conversion function then fills up the provided buffer exactly - but does not null terminate the string.

This flaw can lead to stack contents accidently getting returned as part of the converted string.

libcurl's URL API function curl_url_get() offers punycode conversions, to and from IDN. Asking to convert a name that is exactly 256 bytes, libcurl ends up reading outside of a stack based buffer when built to use the macidn IDN backend. The conversion function then fills up the provided buffer exactly - but does not null-terminate the string.

This flaw can lead to stack contents accidentally getting returned as part of the converted string.

These are all security issues fixed in the curl-8.9.0-1.1 package on the GA media of openSUSE Tumbleweed.

This update for curl fixes the following issues:

Update to version 8.14.1 (jsc#PED-13055, jsc#PED-13056).

Security issues fixed:

• CVE-2025-0665: eventfd double close can cause libcurl to act unreliably (bsc#1236589).
• CVE-2025-4947: QUIC certificate check is skipped with wolfSSL allows for MITM attacks (bsc#1243397).
• CVE-2025-5025: no QUIC certificate pinning with wolfSSL can lead to connections to impostor servers that are not easily noticed (bsc#1243706).
• CVE-2025-5399: bug in websocket code can cause libcurl to get trapped in an endless busy-loop when processing specially crafted packets (bsc#1243933).
• CVE-2024-6874: punycode conversions to/from IDN can leak stack content when libcurl is built to use the macidn IDN backend (bsc#1228260).
• CVE-2025-9086: bug in patch comparison logic when processing cookies can lead to out-of-bounds read in heap buffer (bsc#1249191).
• CVE-2025-10148: predictable websocket mask can lead to proxy cache poisoning by malicious server (bsc#1249348).

Other issues fixed:

• Fix wrong return code when --retry is used (bsc#1249367).

  • tool_operate: fix return code when --retry is used but not triggered [b42776b]

• Fix the --ftp-pasv option in curl v8.14.1 (bsc#1246197).

  • tool_getparam: fix --ftp-pasv [5f805ee]

• Fixed with version 8.14.1:

  • TLS: add CURLOPT_SSL_SIGNATURE_ALGORITHMS and --sigalgs.
  • websocket: add option to disable auto-pong reply.
  • huge number of bugfixes.

  Please see https://curl.se/ch/ for full changelogs.