CVE-2026-26740

Giflib buffer overflow

8.2 HIGHPublic exploitEPSS 1.03%

Published18 Mar 2026

Description

Buffer Overflow vulnerability in giflib v.5.2.2 allows a remote attacker to cause a denial of service via the EGifGCBToExtension overwriting an existing Graphic Control Extension block without validating its allocated size.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeUnchanged

ConfidentialityNone

IntegrityLow

AvailabilityHigh

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

Affected products

Giflib5.2.2

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

and 11 more references

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2026-26740 being actively exploited?

CVE-2026-26740 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.03%.

How severe is CVE-2026-26740?

CVE-2026-26740 has a CVSS 3.1 base score of 8.2, rated high. EPSS estimates a 1.03% probability of exploitation.

Which products are affected by CVE-2026-26740?

Affected products include Giflib.

How do I fix CVE-2026-26740?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-26740 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.