CVE-2024-27316

HTTP/2 incoming headers exceeding the limit are temporarily buffered in nghttp2 in order to generate an informative HTTP 413 response. If a client does not stop sending headers, this leads to memory exhaustion.

HTTP/2 incoming headers exceeding the limit are temporarily buffered in nghttp2 in order to generate an informative HTTP 413 response. If a client does not stop sending headers, this leads to memory exhaustion.

HTTP/2 incoming headers exceeding the limit are temporarily buffered in nghttp2 in order to generate an informative HTTP 413 response. If a client does not stop sending headers, this leads to memory exhaustion.

HTTP/2 incoming headers exceeding the limit are temporarily buffered in nghttp2 in order to generate an informative HTTP 413 response. If a client does not stop sending headers, this leads to memory exhaustion.

HTTP/2 incoming headers exceeding the limit are temporarily buffered in nghttp2 in order to generate an informative HTTP 413 response. If a client does not stop sending headers, this leads to memory exhaustion.

Mod_h[ttp]2 is an official Apache httpd module, first released in 2.4.17. See Apache downloads to get a released version. mod_proxy_h[ttp]2 has been released in 2.4.23.

Security Fix(es):

HTTP/2 incoming headers exceeding the limit are temporarily buffered in nghttp2 in order to generate an informative HTTP 413 response. If a client does not stop sending headers, this leads to memory exhaustion.(CVE-2024-27316)

Apache HTTP Server is a powerful and flexible HTTP/1.1 compliant web server.

Security Fix(es):

Faulty input validation in the core of Apache allows malicious or exploitable backend/content generators to split HTTP responses.

This issue affects Apache HTTP Server: through 2.4.58. (CVE-2023-38709)

HTTP Response splitting in multiple modules in Apache HTTP Server allows an attacker that can inject malicious response headers into backend applications to cause an HTTP desynchronization attack.

Users are recommended to upgrade to version 2.4.59, which fixes this issue.(CVE-2024-24795)

HTTP/2 incoming headers exceeding the limit are temporarily buffered in nghttp2 in order to generate an informative HTTP 413 response. If a client does not stop sending headers, this leads to memory exhaustion.(CVE-2024-27316)

HTTP/2 incoming headers exceeding the limit are temporarily buffered in nghttp2 in order to generate an informative HTTP 413 response. If a client does not stop sending headers, this leads to memory exhaustion.

The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

Security Fix(es):

• httpd: mod_http2: CONTINUATION frames DoS (CVE-2024-27316)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The mod_h2 Apache httpd module implements the HTTP2 protocol (h2+h2c) on top of libnghttp2 for httpd 2.4 servers.

Security Fix(es):

• httpd: CONTINUATION frames DoS (CVE-2024-27316)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The mod_h2 Apache httpd module implements the HTTP2 protocol (h2+h2c) on top of libnghttp2 for httpd 2.4 servers.

Security Fix(es):

• mod_http2: httpd: CONTINUATION frames DoS (CVE-2024-27316)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

HTTP/2 incoming headers exceeding the limit are temporarily buffered in nghttp2 in order to generate an informative HTTP 413 response. If a client does not stop sending headers, this leads to memory exhaustion.

• CVE-2024-27316: fix HTTP/2 DoS vulnerability caused by memory exhaustion from endless continuation frames: Incoming headers that exceed limits are buffered in nghttp2 to generate an HTTP 413 response

• CVE-2024-27316: fix HTTP/2 DoS vulnerability caused by memory exhaustion from endless continuation frames: Incoming headers that exceed limits are buffered in nghttp2 to generate an HTTP 413 response

• CVE-2024-27316: fix HTTP/2 DoS vulnerability caused by memory exhaustion from endless continuation frames: Incoming headers that exceed limits are buffered in nghttp2 to generate an HTTP 413 response

• SECURITY UPDATE: Memory exhaustion due to excessive HTTP/2 incoming headers buffering
  • debian/patches/CVE-2024-27316.patch: Fix to bail after too many failed reads, increment count on request headers failed to add
  • CVE-2024-27316
• SECURITY UPDATE: Faulty input validation in the core of Apache allows malicious or exploitable backend/content generators to split HTTP responses
  • debian/patches/CVE-2023-38709.patch: header validation after content-* are eval'ed
  • CVE-2023-38709
• SECURITY UPDATE: HTTP response splitting in multiple modules in Apache HTTP Server allows an attacker that can inject malicious response headers into backend applications to cause an HTTP desynchronization attack
  • debian/patches/CVE-2024-24795.patch: let httpd handle CL/TE for non-http handlers
  • CVE-2024-24795

• CVE-2024-27316: Limit buffering of HTTP/2 incoming headers to prevent memory exhaustion

Apache has been updated to version 2.4.59 to fix CVE-2024-27316, CVE-2024-24795 and CVE-2023-38709. CVE-2024-27316: Apache HTTP Server: HTTP/2 DoS by memory exhaustion on endless continuation frames (cve.mitre.org) HTTP/2 incoming headers exceeding the limit are temporarily buffered in nghttp2 in order to generate an informative HTTP 413 response. If a client does not stop sending headers, this leads to memory exhaustion. Credits: Bartek Nowotarski (https://nowotarski.info/) CVE-2024-24795: Apache HTTP Server: HTTP Response Splitting in multiple modules (cve.mitre.org) HTTP Response splitting in multiple modules in Apache HTTP Server allows an attacker that can inject malicious response headers into backend applications to cause an HTTP desynchronization attack. Users are recommended to upgrade to version 2.4.59, which fixes this issue. Credits: Keran Mu, Tsinghua University and Zhongguancun Laboratory. CVE-2023-38709: Apache HTTP Server: HTTP response splitting (cve.mitre.org) Faulty input validation in the core of Apache allows malicious or exploitable backend/content generators to split HTTP responses. This issue affects Apache HTTP Server: through 2.4.58. Credits: Orange Tsai (@orange_8361) from DEVCORE

The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

Security Fix(es):

• httpd: mod_http2: CONTINUATION frames DoS (CVE-2024-27316)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The mod_h2 Apache httpd module implements the HTTP2 protocol (h2+h2c) on top of libnghttp2 for httpd 2.4 servers.

Security Fix(es):

• mod_http2: httpd: CONTINUATION frames DoS (CVE-2024-27316)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

This update for apache2 fixes the following issues:

• CVE-2023-38709: Fixed faulty input validation inside the HTTP response splitting code (bsc#1222330).
• CVE-2024-24795: Fixed handling of malicious HTTP splitting response headers in multiple modules (bsc#1222332).
• CVE-2024-27316: Fixed HTTP/2 CONTINUATION frames that could have been utilized for DoS attacks (bsc#1221401).

This update for apache2 fixes the following issues:

• CVE-2023-38709: Fixed faulty input validation inside the HTTP response splitting code (bsc#1222330).
• CVE-2024-24795: Fixed handling of malicious HTTP splitting response headers in multiple modules (bsc#1222332).
• CVE-2024-27316: Fixed HTTP/2 CONTINUATION frames that could have been utilized for DoS attacks (bsc#1221401).

This update for apache2 fixes the following issues:

• CVE-2023-38709: Fixed faulty input validation inside the HTTP response splitting code (bsc#1222330).
• CVE-2024-24795: Fixed handling of malicious HTTP splitting response headers in multiple modules (bsc#1222332).
• CVE-2024-27316: Fixed HTTP/2 CONTINUATION frames that could have been utilized for DoS attacks (bsc#1221401).

This update for apache2 fixes the following issues:

• CVE-2023-38709: Fixed HTTP response splitting (bsc#1222330).
• CVE-2024-24795: Fixed HTTP response splitting in multiple modules (bsc#1222332).
• CVE-2024-27316: Fixed HTTP/2 CONTINUATION frames can be utilized for DoS attacks (bsc#1221401).

This update for apache2 fixes the following issues

• CVE-2026-23918: http2: double free and possible RCE on early reset (bsc#1263957).
• CVE-2026-24072: mod_rewrite elevation of privileges via ap_expr (bsc#1263935).
• CVE-2026-28780: heap buffer overflow in mod_proxy_ajp via ajp_msg_check_header() (bsc#1264163).
• CVE-2026-29167: mod_ldap per-dir use-after-free (bsc#1267976).
• CVE-2026-29168: allocation of resources without limits in mod_md via OCSP response (bsc#1264150).
• CVE-2026-29169: NULL pointer dereference in mod_dav_lock allows server crash via malicious requests (bsc#1263956).
• CVE-2026-29170: mod_proxy_ftp XSS (bsc#1267977).
• CVE-2026-33006: mod_auth_digest timing attack allows bypass of Digest authentication (bsc#1263955).
• CVE-2026-33007: NULL pointer dereference in mod_authn_socache allows unauthenticated remote user to crash a child processes (bsc#1263954).
• CVE-2026-33523: HTTP response splitting forwarding malicious status line (bsc#1263953).
• CVE-2026-33857: off-by-one OOB reads in AJP getter functions (bsc#1263952).
• CVE-2026-34032: heap buffer overread in mod_proxy_ajp due to missing null-termination check (bsc#1263951).
• CVE-2026-34059: heap buffer overread and memory disclosure via ajp_parse_data() (bsc#1263950).
• CVE-2026-34355: mod_proxy_html buffer overflow (bsc#1267978).
• CVE-2026-34356: malicious backend servers can lead to a heap-based buffer overflow (bsc#1267955).
• CVE-2026-42535: malicious path manipulation can lead to child process crashes (bsc#1267956).
• CVE-2026-42536: processing untrusted content can lead to a heap-based buffer overflow (bsc#1267962).
• CVE-2026-43951: out-of-bound read in merge_response_headers can cause crash (bsc#1267963).
• CVE-2026-44119: improper privilege management can lead to an unauthorized read (bsc#1267965).
• CVE-2026-44185: Stack Buffer Over-Read in mod_ssl OCSP send_request (bsc#1267969).
• CVE-2026-44186: responses from an attacker-controlled FTP backend can lead to resource exhaustion and a denial of service (bsc#1267970).
• CVE-2026-44631: crafted regular expression can lead to a buffer underwrite (bsc#1267971).
• CVE-2026-48913: file handle exhaustion during request processing in mod_http2 can lead to a use-after-free (bsc#1267972).
• CVE-2026-49975: Fix cookie header accounting against LimitRequestFields (bsc#1267503).

Non security issue:

• Update to 2.4.66 (jsc#PED-16334).

Orange Tsai discovered that the Apache HTTP Server incorrectly handled validating certain input. A remote attacker could possibly use this issue to perform HTTP request splitting attacks. (CVE-2023-38709)

Keran Mu and Jianjun Chen discovered that the Apache HTTP Server incorrectly handled validating certain input. A remote attacker could possibly use this issue to perform HTTP request splitting attacks. (CVE-2024-24795)

Bartek Nowotarski discovered that the Apache HTTP Server HTTP/2 module incorrectly handled endless continuation frames. A remote attacker could possibly use this issue to cause the server to consume resources, leading to a denial of service. (CVE-2024-27316)

USN-6729-1 fixed several vulnerabilities in Apache. This update provides the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.

Original advisory details:

Orange Tsai discovered that the Apache HTTP Server incorrectly handled validating certain input. A remote attacker could possibly use this issue to perform HTTP request splitting attacks. (CVE-2023-38709)

Keran Mu and Jianjun Chen discovered that the Apache HTTP Server incorrectly handled validating certain input. A remote attacker could possibly use this issue to perform HTTP request splitting attacks. (CVE-2024-24795)

Bartek Nowotarski discovered that the Apache HTTP Server HTTP/2 module incorrectly handled endless continuation frames. A remote attacker could possibly use this issue to cause the server to consume resources, leading to a denial of service. This issue was addressed only in Ubuntu 18.04 LTS. (CVE-2024-27316)

USN-6729-1 fixed vulnerabilities in Apache HTTP Server. This update provides the corresponding updates for Ubuntu 24.04 LTS.

Original advisory details:

Orange Tsai discovered that the Apache HTTP Server incorrectly handled validating certain input. A remote attacker could possibly use this issue to perform HTTP request splitting attacks. (CVE-2023-38709)

Keran Mu and Jianjun Chen discovered that the Apache HTTP Server incorrectly handled validating certain input. A remote attacker could possibly use this issue to perform HTTP request splitting attacks. (CVE-2024-24795)

Bartek Nowotarski discovered that the Apache HTTP Server HTTP/2 module incorrectly handled endless continuation frames. A remote attacker could possibly use this issue to cause the server to consume resources, leading to a denial of service. (CVE-2024-27316)