CVE-2026-26740

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{"bugzilla": {"description": "giflib: giflib: Denial of Service via buffer overflow in EGifGCBToExtension", "id": "2448747", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2448747"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["A flaw was found in giflib. A remote attacker can exploit a buffer overflow vulnerability in the EGifGCBToExtension function by providing a specially crafted Graphics Control Extension (GCE) block. This allows overwriting an existing GCE block without proper size validation, leading to a denial of service (DoS) on the system."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-26740", "package_state": [{"cpe": "cpe:/a:redhat:openjdk_els:11", "fix_state": "Affected", "package_name": "java-11-openjdk", "product_name": "Red Hat build of OpenJDK 11 ELS"}, {"cpe": "cpe:/a:redhat:openjdk_els:11", "fix_state": "Affected", "package_name": "java-11-openjdk-portable", "product_name": "Red Hat build of OpenJDK 11 ELS"}, {"cpe": "cpe:/a:redhat:openjdk:17", "fix_state": "Affected", "package_name": "java-17-openjdk-portable", "product_name": "Red Hat build of OpenJDK 17"}, {"cpe": "cpe:/a:redhat:openjdk:1.8", "fix_state": "Affected", "package_name": "java-1.8.0-openjdk-portable", "product_name": "Red Hat build of OpenJDK 1.8"}, {"cpe": "cpe:/a:redhat:openjdk:21", "fix_state": "Affected", "package_name": "java-21-openjdk-portable", "product_name": "Red Hat build of OpenJDK 21"}, {"cpe": "cpe:/a:redhat:openjdk:25", "fix_state": "Affected", "package_name": "java-25-openjdk-portable", "product_name": "Red Hat build of OpenJDK 25"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "giflib", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "java-21-openjdk", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "java-25-openjdk", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Affected", "package_name": "giflib", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "giflib", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "java-1.8.0-openjdk", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "giflib", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "java-17-openjdk", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "java-1.8.0-openjdk", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "java-21-openjdk", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "giflib", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "java-17-openjdk", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "java-1.8.0-openjdk", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "java-21-openjdk", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "java-25-openjdk", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-03-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-26740\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-26740\nhttps://github.com/zakkanijia/POC/blob/main/giflib/giftool/giflib_giftool_gce_len_heap_oobwrite_disclosure.md"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "5.2.2"}}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "n/a", "source": "cna", "vendor": "n/a"}, "product": "giflib", "vendor": "giflib"}], "analysis": {"en": {"generated_at": "2026-03-21T06:49:34.039519+00:00", "value": {"mitigation_remediation": ["Upgrade giflib to the latest available release that contains a fix for the EGifGCBToExtension buffer overflow.", "If upgrading is not immediately possible, implement a workaround by validating the size of any Graphic Control Extension block before passing it to EGifGCBToExtension or by limiting processing to trusted GIF sources.", "Continuously monitor application logs for repeated failures or abnormal GIF parsing activity and apply additional controls if suspicious activity is detected."], "summary": {"action": "Apply Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "The vulnerability affects the giflib library, version 5.2.2, distributed by giflib_project. Systems that integrate this specific library and decode GIF files may be susceptible. No other vendors or version ranges were identified in the advisory.", "description_and_impact": "A buffer overflow in the EGifGCBToExtension function of giflib version 5.2.2 allows a remote attacker to overwrite the memory of an existing Graphic Control Extension block when it fails to validate the block's allocated size. The flaw can be triggered by a malicious GIF file, resulting in a denial of service by crashing the application or terminating the associated process. This attack targets memory integrity, reflected in CWE\u2011787. The impact is a loss of availability for any service relying on giflib to process GIF images.", "risk_and_exploitability": "The CVSS score of 8.2 indicates a high severity rating, while the EPSS score of less than 1 percent suggests a low probability of exploitation in the wild. The flaw is not listed in the CISA KEV catalog, which further indicates that no widespread, active exploitation is known. The likely attack surface is remote, through a crafted GIF file that a user or client submits to a process using giflib. These conditions mean that administrators of affected systems should treat the issue carefully, applying a fix and monitoring for attempts to exploit the overflow."}}}}, "created": "2026-03-19T08:56:56.963085+00:00", "updated": "2026-03-24T10:53:58.213737+00:00", "vendors": ["giflib", "giflib$PRODUCT$giflib"]}