CVE-2026-58013

mediumCVSS 6.5covered by 2 sourcesfirst seen 2026-06-09

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.

CSIRTS triage

What: This vulnerability involves a buffer over-read in the g_io_channel_read_line_backend function.
Who is affected: Deployments using the affected Glib library.
Urgency: Remediation is medium due to the severity rating of 6.5.
Action: Apply the patch for CVE-2026-58013.

AI-assisted analysis generated from the source advisory — verify against the original.

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Exploitation outlook

Low exploitation risk0.33% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 25% of all EPSS-scored CVEs.

Advisory coverage (2)

mediumCVE-2026-58013: A flaw was found in GLib. A buffer over-read can occur in g_io_channel_read_line_backend() in …nvd · 2026-06-30
mediumCVE-2026-58013: Glib: buffer over-read in glib/giochannel.c via "g_io_channel_read_line_backend"msrc · 2026-06-09

External references

NVD record for CVE-2026-58013

CVE.org record

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