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ALSA-2021:3816 — Important: httpd:2.4 security update

2026-10-04T22:43:51.440349+00:00

Affected: AlmaLinux:8: mod_http2, AlmaLinux:8: mod_md

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

Security Fix(es):

* httpd: mod_proxy: SSRF via a crafted request uri-path containing "unix:" (CVE-2021-40438)

* httpd: mod_session: Heap overflow via a crafted SessionHeader value (CVE-2021-26691)

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.

bdu:2021-03678

2026-10-04T22:43:51.440473+00:00

bdu:2021-03678

Withdrawn: BELL-CVE-2021-26691 — CVE-2021-26691 does not affect BellSoft software

2026-10-04T22:43:51.440519+00:00

Withdrawn by the publisher.

BIT-apache-2021-26691 — Apache HTTP Server mod_session response handling heap overflow

2026-10-04T22:43:51.440548+00:00

Affected: Bitnami: apache

In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server could cause a heap overflow

certfr-2021-avi-805 — De multiples vulnérabilités ont été découvertes dans les produits Oracle Systems. Certaines d'entre elles permettent à…

2026-10-04T22:43:51.440574+00:00

certfr-2021-avi-805

EUVD-2026-25129

2026-10-04T22:43:51.440591+00:00

EUVD-2026-25129

fkie_cve-2021-26691

2026-10-04T22:43:51.440603+00:00

In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server could cause a heap overflow

GHSA-j3ww-p97m-gh9x

2026-10-04T22:43:51.440625+00:00

In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server could cause a heap overflow

gsd-2021-26691

2026-10-04T22:43:51.440639+00:00

gsd-2021-26691

ICSA-22-132-02 — Mitsubishi Electric MELSOFT iQ AppPortal

2026-10-04T22:43:51.440649+00:00

Apache HTTP Server Versions 2.4.0 to 2.4.46 allow unprivileged local users to stop httpd on Windows.CVE-2020-13938 has been assigned to this vulnerability. A CVSS v3 base score of 5.5 has been assigned; the CVSS vector string is (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). In Apache HTTP Server Versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server could cause a heap overflow.CVE-2021-26691 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP Server Versions 2.4.48 and earlier.CVE-2021-34798 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). An attacker who can present SM2 content for decryption to an application could cause data to overflow the buffer up to a maximum of 62 bytes, altering the contents of other data held after the buffer or causing the application to crash. The location of the buffer is application dependent but is typically heap allocated. Fixed in OpenSSL 1.1.1 (Affected 1.1.1-1.1.1k). This issue is detailed further in CVE-2021-3711.CVE-2021-3711 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). A carefully crafted request body can ca…

msrc_CVE-2021-26691 — Apache HTTP Server mod_session response handling heap overflow

2026-10-04T22:43:51.440693+00:00

msrc_CVE-2021-26691

OESA-2021-1246 — httpd security update

2026-10-04T22:43:51.440710+00:00

Affected: openEuler:20.03-LTS-SP1: httpd

Apache HTTP Server is a powerful and flexible HTTP/1.1 compliant web server. Security Fix(es): In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server could cause a heap overflow(CVE-2021-26691) Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service(CVE-2020-13950) Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Digest nonce can cause a stack overflow in mod_auth_digest. There is no report of this overflow being exploitable, nor the Apache HTTP Server team could create one, though some particular compiler and/or compilation option might make it possible, with limited consequences anyway due to the size (a single byte) and the value (zero byte) of the overflow(CVE-2020-35452)

Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with MergeSlashes OFF(CVE-2021-30641)

openSUSE-SU-2021:0908-1 — Security update for apache2

2026-10-04T22:43:51.440738+00:00

Security update for apache2

RHSA-2021:4613 — Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.37 SP10 security update

2026-10-04T22:43:51.440758+00:00

httpd: mod_proxy_wstunnel tunneling of non Upgraded connection pcre: Buffer over-read in JIT when UTF is disabled and \X or \R has fixed quantifier greater than 1 httpd: mod_proxy NULL pointer dereference pcre: Integer overflow when parsing callout numeric arguments httpd: Single zero byte stack overflow in mod_auth_digest JBCS: URL normalization issue with dot-dot-semicolon(s) leads to information disclosure openssl: Read buffer overruns processing ASN.1 strings openssl: integer overflow in CipherUpdate openssl: NULL pointer dereference in X509_issuer_and_serial_hash() httpd: mod_session: NULL pointer dereference when parsing Cookie header httpd: mod_session: Heap overflow via a crafted SessionHeader value httpd: Unexpected URL matching with 'MergeSlashes OFF' httpd: NULL pointer dereference via malformed requests

SUSE-SU-2021:2004-1 — Security update for apache2

2026-10-04T22:43:51.440799+00:00

Security update for apache2

UBUNTU-CVE-2021-26691

2026-10-04T22:43:51.440818+00:00

Affected: Ubuntu:Pro:14.04:LTS: apache2, Ubuntu:Pro:16.04:LTS: apache2, Ubuntu:18.04:LTS: apache2, Ubuntu:20.04:LTS: apache2

In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server could cause a heap overflow

WID-SEC-W-2022-0438 — Apache HTTP Server: Mehrere Schwachstellen

2026-10-04T22:43:51.440842+00:00

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Apache HTTP Server ausnutzen, um einen Denial of Service Angriff durchzuführen, Sicherheitsvorkehrungen zu umgehen oder sonstige Auswirkungen zu verursachen.