Vulnerability details
CVE-2026-26740
Red Hat Enterprise Linux 6
CVSS 3.1
7.5High
Official 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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.2High | 3.1 | CISA ADP / Vulnrichment (CISA-ADP) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H |
| 7.5High | 3.1 | CVEProject cvelistV5 (CNA) (redhat-SADP) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 6 | All | CVEProject cvelistV5 (CNA) |
References and advisories
21- https://github.com/zakkanijia/POC/blob/main/giflib/giftool/giflib_giftool_gce_len_heap_oobwrite_disclosure.md
- https://access.redhat.com/security/cve/CVE-2026-26740 vdb-entryx_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2448747 issue-trackingx_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26740.json x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:33447 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:9689 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:9693 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:33502 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:33503 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:9683 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:9686 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:33450 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:33455 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:33456 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:33509 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:33452 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:33451 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:33501 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:36004 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:36005 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:36006 vendor-advisoryx_refsource_REDHAT
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Details
- Published
- 2026-03-18
- Last updated
- 2026-07-23
- State
- Published
- Assigner (CNA)
- mitre
Exploit prediction (EPSS)
0.65%
Probability of exploitation in 30 days
51.6%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Proof of concept
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-787Out-of-bounds Write