How severe is CVE-2026-26740?

CVE-2026-26740 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability high.

Is CVE-2026-26740 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-26740?

CVE-2026-26740 affects Giflib Project Giflib. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-26740?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-26740 have an EU (EUVD) identifier?

Yes. CVE-2026-26740 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12914.

When was CVE-2026-26740 published?

CVE-2026-26740 was published on 2026-03-18 and last updated on 2026-07-07.

CVE-2026-26740

CVE-2026-26740 is a high-severity vulnerability in Giflib Project Giflib with a CVSS 3.x base score of 8.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: High (CVSS 3.x base score 8.2)
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-12914
Weakness: CWE-787
Affected product: Giflib Project Giflib
Published: 2026-03-18
Last modified: 2026-07-07

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.

Frequently asked questions

What is CVE-2026-26740?: 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.
How severe is CVE-2026-26740?: CVE-2026-26740 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability high.
Is CVE-2026-26740 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-26740?: CVE-2026-26740 affects Giflib Project Giflib. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-26740?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-26740 have an EU (EUVD) identifier?: Yes. CVE-2026-26740 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12914.
When was CVE-2026-26740 published?: CVE-2026-26740 was published on 2026-03-18 and last updated on 2026-07-07.

References

Affected products (1)

cpe:2.3:a:giflib_project:giflib:5.2.2:*:*:*:*:*:*:*

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