CVE-2025-49176
published 2025-06-17CVE-2025-49176: A flaw was found in the Big Requests extension. The request length is multiplied by 4 before checking against the maximum allowed size, potentially causing an…
PriorityP337high7.3CVSS 3.1
AVLACLPRLUINSUCLIHAH
EPSS
0.31%
23.0th percentile
A flaw was found in the Big Requests extension. The request length is multiplied by 4 before checking against the maximum allowed size, potentially causing an integer overflow and bypassing the size check.
Affected
11 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | xorg-server | < xorg-server 2:21.1.7-3+deb12u10 (bookworm) | xorg-server 2:21.1.7-3+deb12u10 (bookworm) |
| debian | xwayland | < xorg-server 2:21.1.7-3+deb12u10 (bookworm) | xorg-server 2:21.1.7-3+deb12u10 (bookworm) |
| linux | linux_kernel | >= 0 < 4.15.0-239.251 | 4.15.0-239.251 |
| msrc | azl3_wayland_1.22.0-1_on_azure_linux_3.0 | — | — |
| msrc | cbl2_xorg-x11-server_1.20.10-16_on_cbl_mariner_2.0 | — | — |
| x.org | xorg-server | >= 0 < 2:1.20.11-1+deb11u16 | 2:1.20.11-1+deb11u16 |
| x.org | xorg-server | >= 0 < 2:21.1.7-3+deb12u10 | 2:21.1.7-3+deb12u10 |
| x.org | xorg-server | >= 0 < 2:21.1.16-1.3 | 2:21.1.16-1.3 |
| x.org | xorg-server | >= 0 < 2:21.1.16-1.3 | 2:21.1.16-1.3 |
| x.org | xwayland | < 24.1.7 | 24.1.7 |
| x.org | xwayland | >= 0 < 2:24.1.8-1 | 2:24.1.8-1 |
CVSS provenance
nvdv3.17.3HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
osv7.8HIGH
vendor_debian7.3HIGH
vendor_redhat7.3HIGH
vendor_msrc6.6MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
Ubuntu
X.Org X Server vulnerabilities
vendor_ubuntu·2025-06-18
CVE-2025-49179 X.Org X Server vulnerabilities
Title: X.Org X Server vulnerabilities
Summary: Several security issues were fixed in X.Org X Server.
USN-7573-1 fixed several vulnerabilities in X.Org. This update provides
the corresponding update for Ubuntu 16.04 LTS, Ubuntu 18.04 LTS and Ubuntu
20.04 LTS.
Original advisory details:
Nils Emmerich discovered that the X.Org X Server incorrectly handled
certain memory operations. An attacker could use these issues to cause the
X Server to crash, leading to a denial of service, obtain sensitive
information, or possibly execute arbitrary code.
Instructions: After a standard system update you need to reboot your computer to make all
the necessary changes.
Ubuntu
X.Org X Server vulnerabilities
vendor_ubuntu·2025-06-17
CVE-2025-49176 X.Org X Server vulnerabilities
Title: X.Org X Server vulnerabilities
Summary: Several security issues were fixed in X.Org X Server.
Nils Emmerich discovered that the X.Org X Server incorrectly handled
certain memory operations. An attacker could use these issues to cause the
X Server to crash, leading to a denial of service, obtain sensitive
information, or possibly execute arbitrary code.
Instructions: After a standard system update you need to reboot your computer to make all
the necessary changes.
Red Hat
xorg-x11-server-Xwayland: xorg-x11-server: tigervnc: Integer Overflow in Big Requests Extension
vendor_redhat·2025-06-17·CVSS 7.3
CVE-2025-49176 [HIGH] CWE-190 xorg-x11-server-Xwayland: xorg-x11-server: tigervnc: Integer Overflow in Big Requests Extension
xorg-x11-server-Xwayland: xorg-x11-server: tigervnc: Integer Overflow in Big Requests Extension
A flaw was found in the Big Requests extension. The request length is multiplied by 4 before checking against the maximum allowed size, potentially causing an integer overflow and bypassing the size check.
A flaw was found in the Big Requests extension. The request length is multiplied by 4 before checking against the maximum allowed size, potentially causing an integer overflow and bypassing the size check.
Statement: This vulnerability is rated as an important severity because this flaw exists in the Big Requests extension of the X.Org X server, where the length of client requests is multiplied by 4 before validating against the maximum allowed size. This computation can cause an integer ov
Microsoft
Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: integer overflow in big requests extension
vendor_msrc·2025-06-10·CVSS 6.6
CVE-2025-49176 [HIGH] CWE-190 Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: integer overflow in big requests extension
Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: integer overflow in big requests extension
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Mariner: Mariner
redhat: redhat
Customer Action Required: Yes
Remediation: CBL-
Debian
CVE-2025-49176: xorg-server - A flaw was found in the Big Requests extension. The request length is multiplied...
vendor_debian·2025·CVSS 7.3
CVE-2025-49176 [HIGH] CVE-2025-49176: xorg-server - A flaw was found in the Big Requests extension. The request length is multiplied...
A flaw was found in the Big Requests extension. The request length is multiplied by 4 before checking against the maximum allowed size, potentially causing an integer overflow and bypassing the size check.
Scope: local
bookworm: resolved (fixed in 2:21.1.7-3+deb12u10)
bullseye: resolved (fixed in 2:1.20.11-1+deb11u16)
forky: resolved (fixed in 2:21.1.16-1.3)
sid: resolved (fixed in 2:21.1.16-1.3)
trixie: resolved (fixed in 2:21.1.16-1.3)
OSV
linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-hwe, linux-kvm, linux-oracle vulnerabilities
osv·2025-07-08·CVSS 7.8
linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-hwe, linux-kvm, linux-oracle vulnerabilities
linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-hwe, linux-kvm, linux-oracle vulnerabilities
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- PowerPC architecture;
- Block layer subsystem;
- ACPI drivers;
- NILFS2 file system;
- File systems infrastructure;
- Memory management;
- Network traffic control;
- USB sound devices;
(CVE-2025-37932, CVE-2024-53197, CVE-2024-50116, CVE-2021-47379,
CVE-2024-49958, CVE-2022-49179, CVE-2024-46787, CVE-2024-41070,
CVE-2025-38000, CVE-2024-56662, CVE-2022-49176, CVE-2025-37798)
OSV
linux-fips, linux-aws-fips, linux-azure-fips, linux-gcp-fips vulnerabilities
osv·2025-07-08·CVSS 7.8
CVE-2025-37932 linux-fips, linux-aws-fips, linux-azure-fips, linux-gcp-fips vulnerabilities
linux-fips, linux-aws-fips, linux-azure-fips, linux-gcp-fips vulnerabilities
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- PowerPC architecture;
- Block layer subsystem;
- ACPI drivers;
- NILFS2 file system;
- File systems infrastructure;
- Memory management;
- Network traffic control;
- USB sound devices;
(CVE-2025-37932, CVE-2024-53197, CVE-2024-50116, CVE-2021-47379,
CVE-2024-49958, CVE-2022-49179, CVE-2024-46787, CVE-2024-41070,
CVE-2025-38000, CVE-2024-56662, CVE-2022-49176, CVE-2025-37798)
GHSA
GHSA-c5wx-c74v-9c3g: A flaw was found in the Big Requests extension
ghsa_unreviewed·2025-06-17
CVE-2025-49176 [MEDIUM] CWE-190 GHSA-c5wx-c74v-9c3g: A flaw was found in the Big Requests extension
A flaw was found in the Big Requests extension. The request length is multiplied by 4 before checking against the maximum allowed size, potentially causing an integer overflow and bypassing the size check.
OSV
CVE-2025-49176: A flaw was found in the Big Requests extension
osv·2025-06-17·CVSS 7.3
CVE-2025-49176 [HIGH] CVE-2025-49176: A flaw was found in the Big Requests extension
A flaw was found in the Big Requests extension. The request length is multiplied by 4 before checking against the maximum allowed size, potentially causing an integer overflow and bypassing the size check.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://access.redhat.com/errata/RHSA-2025:10258https://access.redhat.com/errata/RHSA-2025:10342https://access.redhat.com/errata/RHSA-2025:10343https://access.redhat.com/errata/RHSA-2025:10344https://access.redhat.com/errata/RHSA-2025:10346https://access.redhat.com/errata/RHSA-2025:10347https://access.redhat.com/errata/RHSA-2025:10348https://access.redhat.com/errata/RHSA-2025:10349https://access.redhat.com/errata/RHSA-2025:10350https://access.redhat.com/errata/RHSA-2025:10351https://access.redhat.com/errata/RHSA-2025:10352https://access.redhat.com/errata/RHSA-2025:10355https://access.redhat.com/errata/RHSA-2025:10356https://access.redhat.com/errata/RHSA-2025:10360https://access.redhat.com/errata/RHSA-2025:10370https://access.redhat.com/errata/RHSA-2025:10374https://access.redhat.com/errata/RHSA-2025:10375https://access.redhat.com/errata/RHSA-2025:10376https://access.redhat.com/errata/RHSA-2025:10377https://access.redhat.com/errata/RHSA-2025:10378https://access.redhat.com/errata/RHSA-2025:10381https://access.redhat.com/errata/RHSA-2025:10410https://access.redhat.com/errata/RHSA-2025:9303https://access.redhat.com/errata/RHSA-2025:9304https://access.redhat.com/errata/RHSA-2025:9305https://access.redhat.com/errata/RHSA-2025:9306https://access.redhat.com/errata/RHSA-2025:9392https://access.redhat.com/errata/RHSA-2025:9964https://access.redhat.com/security/cve/CVE-2025-49176https://bugzilla.redhat.com/show_bug.cgi?id=2369954https://gitlab.freedesktop.org/xorg/xserver/-/commit/03731b326a80b582e48d939fe62cb1e2b10400d9https://gitlab.freedesktop.org/xorg/xserver/-/commit/4fc4d76b2c7aaed61ed2653f997783a3714c4fe1https://www.x.org/wiki/Development/Security/http://www.openwall.com/lists/oss-security/2025/06/18/2https://lists.debian.org/debian-lts-announce/2025/06/msg00028.html
2025-06-17
Published