CVE-2026-58013: gnome glib Buffer Over-read
Vulnerability summary
CVE-2026-58013 is a high (CVSS 8.2) Buffer Over-read vulnerability in gnome glib. EPSS estimates a 0.50% chance of exploitation in the next 30 days, higher than 41.6% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 21 · Related 9Timeline
- 30-06-2026PublishedVulnerability first disclosed.
- 14-10-2026Last modifiedVulnerability information updated.
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 metrics
4 scores · 4 sources · 1 version- CVE.orgCNA6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:LDiffers
- OSV · UbuntuEcosystem advisory · calculated8.2HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
- OSV · DebianEcosystem advisory · calculated8.2HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
EPSS trend
Probability
0.50%
Chance of exploitation in the next 30 days
Percentile
42%
Versus all other CVEs
30-day change
0.00 pp
From 0.50% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (gitlab.gnome.org)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Debian1 product
- glib2.0All versions (No fix recorded) | < 2.84.4-3~deb13u4 | < 2.88.1-2
Gnome1 product
- glib< 2.88.1
Redhat1 product
- enterprise_linuxEOL6.0 | 7.0 | 8.0 | 9.0 | 10.0
Ubuntu1 product
- glib2.0< 2.40.2-0ubuntu1.1+esm8 | < 2.48.2-0ubuntu4.8+esm6 | < 2.56.4-0ubuntu0.18.04.9+esm6 | < 2.64.6-1~ubuntu20.04.9+esm2 | < 2.72.4-0ubuntu2.10 | < 2.80.0-6ubuntu3.9 | All versions (No fix recorded) | < 2.88.0-1ubuntu0.1
4 vendors · 4 products
