Glib Heap Buffer Overflow in g_escape_uri_string()
CVE-2025-13601 Published on November 26, 2025

Glib: integer overflow in in g_escape_uri_string()
A heap-based buffer overflow problem was found in glib through an incorrect calculation of buffer size in the g_escape_uri_string() function. If the string to escape contains a very large number of unacceptable characters (which would need escaping), the calculation of the length of the escaped string could overflow, leading to a potential write off the end of the newly allocated string.

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Vulnerability Analysis

CVE-2025-13601 can be exploited with local system access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity and availability.

Attack Vector:
LOCAL
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
HIGH
Availability Impact:
HIGH

Timeline

Reported to Red Hat.

Made public.

Weakness Type

Integer Overflow or Wraparound

The software performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. An integer overflow or wraparound occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may wrap to become a very small or negative number. While this may be intended behavior in circumstances that rely on wrapping, it can have security consequences if the wrap is unexpected. This is especially the case if the integer overflow can be triggered using user-supplied inputs. This becomes security-critical when the result is used to control looping, make a security decision, or determine the offset or size in behaviors such as memory allocation, copying, concatenation, etc.


Products Associated with CVE-2025-13601

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2025-13601 are published in these products:

Red Hat Enterprise Linux (RHEL)
 
Red Hat Openshift
 
GNOME Glib
 
Canonical Ubuntu Linux
 
Red Hat Enterprise Linux Eus
 
Red Hat Rhel E4s
 
Red Hat Rhel Eus
 
Red Hat Rhel Els
 
Red Hat Rhel Aus
 
Red Hat Rhel Tus
 
Red Hat Rhel Eus Long Life
 
Red Hat Ceph Storage
 
Red Hat Discovery
 
Red Hat Insights Proxy
 
Red Hat Rhui
 

Exploit Probability

EPSS
0.01%
Percentile
0.71%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.