CVE-2026-23918
Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol. This issue affects Apache HTTP Server: 2.4.66.
CVSS
8.8
High
EPSS
45.8%
p99
KEV
—
Exploit Today
30
0-100
Published: May 4, 2026 · Last modified: Jul 15, 2026 · CWE-415 · CWE-1341
45.8%EPSS · 30 days49.7%
2026-06-302026-07-16
Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol. This issue affects Apache HTTP Server: 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.
- httpd.apache.orghttps://httpd.apache.org/security/vulnerabilities_24.html
- www.openwall.comhttp://www.openwall.com/lists/oss-security/2026/05/04/19
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:13938
- access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-23918
- bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2465304
- security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23918.json
CVECVSSEPSSKEVRExploitTitleMod.
CVE-2026-89259.8 CRI61.3%
——18The curl logic that works with SASL authentication could end up cleaning up
the GSASL context *twice* without clearing the pointer in between, making it
`free()` the same pointer twice.9dCVE-2026-338117.5 HIG52.9%
——16When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.11hCVE-2026-506857.5 HIG45.6%
——14Double free in Windows DHCP Server allows an authorized attacker to execute code over a network.2dCVE-2026-430119.8 CRI44.3%
——13In the Linux kernel, the following vulnerability has been resolved:
net/x25: Fix potential double free of skb
When alloc_skb fails in x25_queue_rx_frame it calls kfree_skb(skb) at
line 48 and returns 1 (error).
This error propagates back through the call chain:
x25_queue_rx_frame returns 1
|
v
x25_state3_machine receives the return value 1 and takes the else
branch at line 278, setting queued=0 and returning 0
|
v
x25_process_rx_frame returns queued=0
|
v
x25_backlog_rcv at line 452 sees queued=0 and calls kfree_skb(skb)
again
This would free the same skb twice. Looking at x25_backlog_rcv:
net/x25/x25_in.c:x25_backlog_rcv() {
...
queued = x25_process_rx_frame(sk, skb);
...
if (!queued)
kfree_skb(skb);
}2dCVE-2018-109027.8 HIG40.8%
——12It was found that the raw midi kernel driver does not protect against concurrent access which leads to a double realloc (double free) in snd_rawmidi_input_params() and snd_rawmidi_output_status() which are part of snd_rawmidi_ioctl() handler in rawmidi.c file. A malicious local attacker could possibly use this for privilege escalation.9dCVE-2025-53516.5 MED39.1%
——12A flaw was found in the key export functionality of libssh. The issue occurs in the internal function responsible for converting cryptographic keys into serialized formats. During error handling, a memory structure is freed but not cleared, leading to a potential double free issue if an additional failure occurs later in the function. This condition may result in heap corruption or application instability in low-memory scenarios, posing a risk to system reliability where key export operations are performed.16d