CVE-2026-58013

Description

A flaw was found in GLib. A buffer over-read can occur in g_io_channel_read_line_backend() in the giochannel.c file when a custom line terminator with a length greater than one is set, causing memcmp to read past the GString buffer. This vulnerability can cause a minor information disclosure of 7 bytes or a denial of service when the buffer over-read crosses a page boundary.

CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

EPSS — Exploit Prediction

0.0033

Probability of exploitation

0.25%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-126 CWE-126

Affected Products

Vendor	Product	Versions
gnome	glib	< 2.88.1
redhat	enterprise_linux	All
redhat	enterprise_linux	All
redhat	enterprise_linux	All
redhat	enterprise_linux	All
redhat	enterprise_linux	All

References

Advisories & Patches

https://gitlab.gnome.org/GNOME/glib/-/issues/3925

Exploits

https://gitlab.gnome.org/GNOME/glib/-/issues/3925

Other References

https://access.redhat.com/security/cve/CVE-2026-58013 https://bugzilla.redhat.com/show_bug.cgi?id=2492248

Frequently Asked Questions

What is CVE-2026-58013? +

A flaw was found in GLib. A buffer over-read can occur in g_io_channel_read_line_backend() in the giochannel.c file when a custom line terminator with a length greater than one is set, causing memcmp to read past the GString buffer. This vulnerability can cause a minor information disclosure of 7 bytes or a denial of service when the buffer over-read crosses a page boundary. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-58013? +

CVE-2026-58013 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0033, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-58013? +

CVE-2026-58013 affects products from gnome, redhat, specifically: enterprise_linux, glib. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-58013? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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